Tuesday, 12 February 2019

12Th Class Biology MCQs Solved With Answers Punjab Board Examinations

Here i am sharing with the students of the 2nd years all punjab examinations with solved MCQs quiz with answers. Here all of the past years important objective type questions with answers. Prepared these important MCQs of Biology for the MCAT, Biology Paperes and others important colledge universities papers or tests.

File:MCQs of 2nd year biology.svg
Biology 12th Class MCQs Notes




12th Class Biology MCQs Chapter 1 Homeostasis Punjab Board

Question 1: Malpighian tubules are excretory organs of ?
  1. Vertebrates
  2. Insects
  3. Annelide
  4. Flatworms
B
Question 2: A kidney machine that works on the same principles as in the kidney for the removal of nitrogenous wastes and excess water from the blood is ?
  1. Renal analyser
  2. Dialator
  3. Dialyzer
  4. Analyser
C
Question 3: Mammalian kidney including human is adapted to conserve water by over ?
  1. 20.5%
  2. 50%
  3. 70%
  4. 99.5%
D
Question 4: Collecting tubules open into ?
  1. Urethra
  2. Pelvis
  3. Bowman’s capsule
  4. Glomerulus
B
Question 5: Bowman’s capsule is around a ball of capillaries called ?
  1. Glomerulus
  2. Pelvis
  3. Medulla
  4. Pyramid
A
Question 6: The active uptake of sodium in the ascending limb or thick loop of Henle is promoted by the action of ?
  1. Aldosterone
  2. Androgens
  3. Progesterone
  4. Testosterone
A
Question 7: Antidiuretric hormone (ADH) released from posterior pituitary act to actively transport water from filtrate to kidneys ?
  1. Medulla
  2. Interstitium
  3. Cortex
  4. Pelvis
B
Question 8: Mammals, birds, some fishes and flying insects are ?
  1. Ectotherms
  2. Endotherms
  3. Homotherms
  4. Heterotherms
B
Question 9: Planaria, the flatworms, have simple tubular excretory system called ?
  1. Protonephridium
  2. Prenephridium
  3. Mesonephridium
  4. Metanephridium
A
Question 10: The structural and functional relationship between nutritive and excretory systems exist in ?
  1. Fishes
  2. Cnidarians
  3. Insects
  4. Echinoderms
C
Question 11: Most plants have adapted to survive in heat stress as the plants of temperate regions face the stress of ?
  1. 40˚C
  2. 10˚C
  3. 20˚C
  4. 5˚C
A
Question 12: Pyrogens displace the set point of hypothalamus above the normal point of ?
  1. 35˚C
  2. 33˚C
  3. 32˚C
  4. 37˚C
D
Question 13: About 500 ml water is needed to excrete 1 g of ammonia ?
  1. Oxygen
  2. Hydrogen
  3. Nitrogen
  4. Helium
C
Question 14: The excretory product that requires maximum water for its elimination as compared to other ?
  1. Creatinine
  2. Ammonia
  3. Uric acid
  4. Urea
B
Question 15: In haemodialysis blood is circulated through a machine which contains a dialyzer, called ?
  1. Natural kidney
  2. Artificial kidney
  3. Temporary kidney
  4. Permanent kidney
B
Question 16: Mammals including human maintain their high body temperature within a narrow range of about ?
  1. 35-37˚C
  2. 32-36˚C
  3. 30-32˚C
  4. 36-38˚C
D
Question 17: Flame cells are part of excretory system of ?
  1. Cockroach
  2. Planaria
  3. Earthworm
  4. Hydra
B

12th Class Biology MCQs Chapter 2 Supports and Movements Punjab Board

Question 1: Oestrogen replacement therapy (ERT) offers the best protection against osteoporotic bone ?
  1. Attachments
  2. Fractures
  3. Growths
  4. Separation
B
Question 2: Collenchyma is with heavily lignified cells in ?
  1. All of these
  2. Cortex tissue
  3. Xylem tissue
  4. Phloem tissue
B
Question 3: A condition in which palantine processes of maxilla and palatine fail to fuse is ?
  1. Microcephally
  2. Cleft palate
  3. Myxedema
  4. Cretinism
B
Question 4: Euglena moves with the help of ?
  1. Pseudopodium
  2. Flagellum
  3. Cilium
  4. Myonemes
B
Question 5: Spontaneous movements due to internal causes are ?
  1. Taxis
  2. Tactic
  3. Paratonic
  4. Autonomic
D
Question 6: Flight has evolved in three types of vertebrates namely in ?
  1. Insects, birds and bats
  2. Pterodactyls, birds and bats
  3. Pterodactyls, birds and insects
  4. Pterodactyls, ichthyostega and bats
B
Question 7: Muscle fatigue is caused by the accumulation of ?
  1. Ethyl alcohol
  2. Fumaric acid
  3. CO₂
  4. Lactic acid
D
Question 8: Each A band has a lighter stripe in its midsection called ?
  1. H-zone
  2. A-zone
  3. M-line
  4. Z-line
A
Question 9: At joint muscles work against each other by contraction. This relationship is called ?
  1. Opposed arrangement
  2. Antagonistic arrangement
  3. Hostile arrangement
  4. Aggressive arrangement
B
Question 10: Buoyancy in the water is maintained by a specialized structure in bony fish called ?
  1. Swim bladder
  2. Fins
  3. Tail
  4. Both (a) and (c)
A
Question 11: Healing time for a bone is ?
  1. 8-12 years
  2. 8-12 months
  3. 8-12 days
  4. 8-12 weeks
D
Question 12: Compact bone is dense and strong and provides an attachment site for ?
  1. Nerve
  2. Muscle
  3. Skin
  4. Ligament
B
Question 13: Which of the following muscle fibre contains single nucleus ?
  1. All (a), (b), (c)
  2. Smooth muscle
  3. Cardiac muscle
  4. Skeletal muscle
B
Question 14: Pectoral girdle attaches the arms to the ?
  1. Head
  2. Neck
  3. Hip
  4. Trunk
D
Question 15: In animals that lack a hard skeleton, a fluid filled gastrovascular cavity or coelom can act as ?
  1. Hydrostatic skeleton
  2. Hydrodynamic skeleton
  3. Endoskeleton
  4. Exoskeleton
A
Question 16: An increase in plant girth due to the activity of vascular cambium is called ?
  1. Tertiary growth
  2. Secondary growth
  3. Primary growth
  4. Quaternary growth
B
Question 17: The most complicated exoskeleton is found in ?
  1. Arthropods
  2. Reptiles
  3. Mollusks
  4. Echinoderms
A

12th Class Biology MCQs Chapter 3 Coordination and Control Punjab Board

Question 1: The neuron net of Hydra lacks ?
  1. Dendrites
  2. Direction of impulse flow
  3. Neurons
  4. Connections
B
Question 2: Cytokinins delay the aging of fresh leaf crop, each as cabbage and lettuce as well as keeping flowers ?
  1. Fresh
  2. Attached
  3. Delayed
  4. Open
A
Question 3: Thyroid gland produces ?
  1. All (a), (b), (c)
  2. Calcitonin hormone
  3. Thyroxine or tetraiodo-thryonine
  4. Tri-iodothyrpnine or T3
A
Question 4: LH works with FSH to stimulate oestrogen secretion and rupture of mature follicles to release ?
  1. Sperms
  2. Egg
  3. Ovum
  4. Both (a) and (b)
D
Question 5: Resting membrane potential is ?
  1. 0.05
  2. 0.07
  3. 0.09
  4. 0.03
B
Question 6: Excess MSH is secreted in ?
  1. Addison’s disease
  2. Parkinson’s disease
  3. Aizheimer’s disease
  4. Grave’s disease
A
Question 7: Fibres from the eyes (retina) terminate in the ?
  1. Visual pons of brain
  2. Visual cortese of brain
  3. visual cochlea of brain
  4. Visual cortex of brain
D
Question 8: The onset of epilepsy is usually before age ?
  1. 20
  2. 10
  3. 30
  4. 40
C
Question 9: What in the male stimulates the interstitial cells of the testis to secrete testosterone ?
  1. LTH
  2. ICSH
  3. FSH
  4. LH
B
Question 10: Each type of the principal type of sensation that we can experiences e.g., pain, touch, sight, sound and so forth is called a modality of ?
  1. Sensation
  2. Coordination
  3. Susceptibility
  4. Regulation
A
Question 11: All are components of human fore-brain except ?
  1. Limbic system
  2. Cerebrum
  3. Thalamus
  4. Pons
D
Question 12: Deficiency of thyroxine in adults, perhaps due to iodine shortage in diet, produces a swelling of the neck or ?
  1. Bulge
  2. Tumour
  3. Goitre
  4. Lump
C
Question 13: Pain receptors are nearly 27 times more abundant than ?
  1. Heat receptors
  2. Rheo- receptors
  3. Cold receptors
  4. Wind receptors
C
Question 14: Cortisol brings about an increase in blood glucose level mainly by its production from protein and by antagonizing the action of ?
  1. Progesterone
  2. Glucagons
  3. Insulin
  4. Oestrogen
C
Question 15: Which hormone in males stimulates development of the germinal epithelium of the testis and sperm production ?
  1. ADH
  2. FSH
  3. ACTH
  4. STH
B
Question 16: The most important test in the study of epilepsy is ?
  1. PCR
  2. Electroencephalography
  3. Electrocardiography
  4. Electroradiography
B
Question 17: Development of the secondary male characters is caused by ?
  1. Aldosterone
  2. Vasopressin
  3. Androgens
  4. Oestrogen
C

12th Class Biology MCQs Chapter 4 Reproduction Punjab Board

Question 1: Reproduction is very important for the survival of ?
  1. Both (a) and (c)
  2. Species
  3. Individual
  4. Population
A
Question 2: Plant hormone florigen is produced in ?
  1. Leaves
  2. Root
  3. Stem
  4. Flower
A
Question 3: Decrease of FSH and increase of oestrogen, causes the pituitary gland to secrete ?
  1. Luteotropic hormone
  2. Oxytonic
  3. Vasopressin
  4. Luteinizing hormone
D
Question 4: During delivery in humans, the average loss of blood is about ?
  1. 250 cm³
  2. 450 cm³
  3. 150 cm³
  4. 350 cm³
D
Question 5: In human how many ova are usually discharged from the ovary at one time ?
  1. Two
  2. One
  3. Three
  4. Six
B
Question 6: Most of the major organs of foetus are formed by the ?
  1. 10th week of pregnancy
  2. 18th week of pregnancy
  3. 12th week of pregnancy
  4. 14th week of pregnancy
C
Question 7: Menstruation usually lasts for ?
  1. 2 – 5 days
  2. 1 – 3 days
  3. 3 – 7 days
  4. 5 – 7 days
C
Question 8: The P730-P660 interconversion might be the plant time – regulator for ?
  1. Leafing
  2. Flowering
  3. Shooting
  4. Budding
B
Question 9: The total gestation period (pregnancy) of humans is usually about ?
  1. 100 days
  2. 135 days
  3. 280 days
  4. 180 days
C
Question 10: During pregnancy pituitary gland produces ?
  1. Oxytocin
  2. Gonadotrophin
  3. Luteotropic hormone
  4. Smoatotrophin
C
Question 11: If the two generation are vegetatively similar such alternation of generation is referred to as ?
  1. Heteromorphic
  2. Isomorphic
  3. Homomorphic
  4. Eumorphic
B
Question 12: P660 is converted to active P730 by the absorption of ?
  1. Orange light
  2. Yellow light
  3. Blue light
  4. Red light
D
Question 13: The animals in which development of embryo is accomplished inside the female body and give birth to young one are called ?
  1. Ovoviviparous
  2. Oviparous
  3. Viviparous
  4. Euviviparous
C
Question 14: P 660 absorbs red light at a wave length of 660 nm and is converted to active ?
  1. P 630
  2. P 730
  3. P 430
  4. P 530
B
Question 15: Between the seminiferous tubules are interstitial cells which secrete ?
  1. Oestrogen
  2. Progesterone
  3. Oxytocin
  4. Testosterone
D
Question 16: A structure established between the uterine and foetal tissues for the exchange of oxygen, carbon dioxide, waste, nutrients and other materials is ?
  1. Placenta
  2. Canal
  3. Bridge
  4. Channel
A
Question 17: In human how many ova are usually discharged from the ovary at one time ?
  1. One
  2. Two
  3. Four
  4. Three
A

12th Class Biology MCQs Chapter 5 Growth & Development Punjab Board

Question 1: Clear cytoplasm produces ?
  1. Neural tube
  2. Gut
  3. Larval epidermis
  4. Muscle cells
C
Question 2: Anything which interferes with the normal process of development is the factor causing ?
  1. Regeneration
  2. Abnormalities
  3. Normalities
  4. Aging
B
Question 3: During elongation the cell volume increases up to 150 fold due to uptake of ?
  1. Water
  2. Light
  3. Carbon dioxide
  4. Oxygen
A
Question 4: For maximum growth, the optimum temperature is 25-30 ˚C and it is least at ?
  1. 6-12˚C
  2. 5-10˚C
  3. 4-8˚C
  4. 1-3˚C
B
Question 5: The discoidal cap of cells above the blastocoels is called ?
  1. Mesoderm
  2. Endoderm
  3. Blastoderm
  4. Ectoderm
C
Question 6: A longitudinal folding has occurred, establishing the neural groove in the mid dorsal line, on either side of neural folds, in chick embryo of ?
  1. 31-32 hours
  2. 25-26 hours
  3. 21-22 hours
  4. 35-36 hours
C
Question 7: In addition to auxin, which hormone also important role in apical dominance ?
  1. 2, 4-D
  2. Cytokinins
  3. Abcesic acid
  4. Gibberellins
B
Question 8: The hypoblast is mainly presumptive ?
  1. Blastoderm
  2. Endoderm
  3. Mesoderm
  4. Ectoderm
B
Question 9: Neural plate was seen as a flat, thickened area of ectoderm in chicks of ?
  1. 24 hours
  2. 22 hours
  3. 18 hours
  4. 20 hours
C
Question 10: Temperature influences the rate of growth with a range from ?
  1. 35˚–53˚C
  2. 36˚–53˚C
  3. 0 – 35 ˚C
  4. 0 – 53˚C
C
Question 11: The anterior end of the neural groove is widest and forms the future brain and rest of portion is future ?
  1. Vertebral column
  2. Spinal cord
  3. Cranium
  4. Notochord
B
Question 12: Grey equatorial cytoplasm produces ?
  1. Notochord
  2. Both (a) and (b)
  3. Neural tube
  4. None
B
Question 13: Immediately after fertilization, the egg undergoes a series of mitotic divisions, called ?
  1. Blastulation
  2. Cleavage
  3. Separation
  4. Splitting
B
Question 14: The branch of biology, which deals with abnormal developments and causes for such developments is ?
  1. Ethiology
  2. Ethnology
  3. Theology
  4. Teratology
D
Question 15: The progressive changes which are undergone before an organism becomes adult, constitute embryonic ?
  1. Induction
  2. Morphogenesis
  3. Fluctuation
  4. Development
D
Question 16: In incubating eggs artificially, the incubators are usually regulated at temperature between ?
  1. 27-29˚C
  2. 36-38˚C
  3. 20-22˚C
  4. 30-32˚C
B
Question 17: Primary tissue is added by the ?
  1. Vertical meristem
  2. Apical meristem
  3. Lateral meristem
  4. Underground meristem
B

12th Class Biology MCQs Chapter 6 Chromosomes and DNA Punjab Board

Question 1: Levene concluded that DNA and RNA molecules are made of repeating units called ?
  1. Nucleosomes
  2. Nucleotides
  3. Nucleic acids
  4. Nucleosides
B
Question 2: There are three DNA polymerases namely I, II and III in ?
  1. Bacteria
  2. Yeast
  3. Fungi
  4. Virus
B
Question 3: The DNA molecule had a shape of a helix with a diameter of 2 nm and a complete helical turn every ?
  1. 1.4 nm
  2. 2.4 nm
  3. 0.4 nm
  4. 3.4 nm
D
Question 4: The sequence of nucleotides that determines the amino acid sequence of a protein is called a ?
  1. Gene
  2. Jean
  3. Codon
  4. Allele
A
Question 5: Which of the following is nonsense codon ?
  1. UUC
  2. AUG
  3. AAA
  4. UAA
D
Question 6: Who showed that the amount of adenine in DNA always equals the amount of thymine, and the amount of guanine always equals the amount of cytosine ?
  1. Martha Chase
  2. James Watson
  3. Erwin Chargaff
  4. Walter Sutton
C
Question 7: The amount of information one chromosome contains would fill about ?
  1. 80 printed books of 100 pages each
  2. 380 printed books of 10000 pages each
  3. 200 printed books of 1000 pages each
  4. 280 printed books of 1000 pages each
D
Question 8: Most chromosomes are about ?
  1. 20% DNA and 80% protein
  2. 40% DNA and 60% protein
  3. 50% DNA and 50% protein
  4. 30% DNA and 70% protein
B
Question 9: A relatively small enzyme that plays a supporting role in DNA replication is ?
  1. DNA Polymerase III
  2. DNA Polymerase I
  3. DNA Polymerase IV
  4. DNA Polymerase II
B
Question 10: Chromosomes are composed of ?
  1. DNA and Sugars
  2. DNA and Fats
  3. RNA and Protein
  4. DNA and Protein
D
Question 11: Every gene starts with codon AUG, which normally encodes the amino acid ?
  1. Citrulline
  2. Lysine
  3. Methionine
  4. Arginine
C
Question 12: The direction of replication is always ?
  1. 3’ → 5’
  2. Both (a) and (b)
  3. None
  4. 5’ → 3’
D
Question 13: Vernon Ingram in 1956 discovered the molecular basis of sickle cell anaemia, a protein defect inherited as a ?
  1. Mongolism
  2. AZ syndrome
  3. Mendelian disorder
  4. Non-disjunction
C
Question 14: In prokaryote within promoter there are two binding sites TTGACA also called -35 sequence and TATAAT also called ?
  1. -20 sequence
  2. -30 sequence
  3. -10 sequence
  4. -35 sequence
C
Question 15: The Meselson – Stahl experiment confirmed the prediction of the Watson-Crick model that DNA replication is ?
  1. Semi-dispersive
  2. Conservative
  3. Semi-conservative
  4. Dispersive
C
Question 16: The number of nucleotides in the DNA of a typical humar chromosome is about ?
  1. 40 million
  2. 140 million
  3. 80 million
  4. 10 million
B
Question 17: A central role for chromosomes in heredity was first suggested in 1900, by ?
  1. Karl Correns
  2. Walter Sutton
  3. Walther Fleming
  4. Gregor Mendel
A

12th Class Biology MCQs Chapter 7 Cell Cycle Punjab Board

Question 1: Interphase can further be divided into ?
  1. G₁ -phase, G₂-phase and G₃-phase
  2. S₁ -phase, G-phase and S2-phase
  3. G₁ -phase, S-phase and G₂-phase
  4. S₁ -phase, S₂-phase and G₃-phase
C
Question 2: Crossing over produces genetic variations necessary for ?
  1. Non-disjunction
  2. Mutation
  3. Evolution
  4. Abnormalities
C
Question 3: Meiosis is the special type of cell division in which the number of chromosomes in daughter cells reduces to ?
  1. One fifth
  2. One third
  3. One fourth
  4. Half
D
Question 4: The separation of homologous chromosomes occur during ?
  1. Telophase
  2. Anaphase
  3. Metaphase
  4. Prophase
B
Question 5: Crossing over is the source of genetic ?
  1. Abbreviations
  2. Abnormalities
  3. Mutation
  4. Variations
D
Question 6: The P730-P660 interconversions might be the plant time-regulator for ?
  1. 30 minutes
  2. 6 hours
  3. 10 hours
  4. 2 hours
C
Question 7: Downs Syndrome (Mongolism) occurs in man, during which 21st chromosome fails to segregate, resulting gamete with ?
  1. 24 chromosomes
  2. 20 chromosomes
  3. 22 chromosomes
  4. 21 chromosomes
A
Question 8: The period of life cycle of cell (cell cycle) between two consecutive divisions is termed as ?
  1. Interphase
  2. Anaphase
  3. Prophase I
  4. Telophase
A
Question 9: Shape of the plant cell does not change greatly compared with an animal cell because it is surrounded by a rigid ?
  1. Cell wall
  2. Capsule
  3. Cell membrane
  4. Sheath
A
Question 10: The paired chromosomes repel each other and begin to separate in ?
  1. Zygotene
  2. Diplotene
  3. Leptotene
  4. Pachytene
B
Question 11: Cells in an organism depend upon various extracellular and intercellular ?
  1. Signals
  2. Distances
  3. Areas
  4. Spaces
A
Question 12: All of the following are the gifts of mitosis except ?
  1. Replacement of older cells
  2. Malignant tumor
  3. Regeneration
  4. Healing of wounds
B
Question 13: Full cell cycle in yeast cells is only ?
  1. 60 minutes
  2. 15 minutes
  3. 90 minutes
  4. 30 minutes
C
Question 14: G₁ (Gap 1) is the period of ?
  1. Metabolic activity
  2. Movement
  3. Synthesis
  4. Rest
A
Question 15: The interphase of meiosis lack ?
  1. G₄ stage
  2. G₂ stage
  3. G₁ stage
  4. G₃ stage
B
Question 16: The pairing of homologous chromosomes is completed in ?
  1. Leptotene
  2. Diplotene
  3. Zygotene
  4. Pachytene
D
Question 17: The affected individuals have one missing — chromosome with only 45 chromosomes in ?
  1. Klinefelter’s syndrome
  2. Down’s syndrome
  3. Turner’s syndrome
  4. Sach’s syndrome
C

12th Class Biology MCQs Chapter 8 Variation and Genetics Punjab Board

Question 1: ABO system has four different phenotypes which are distinct from each other on the basis of specific antigens on the surface of ?
  1. Golgi bodies
  2. RBC
  3. Centrioles
  4. Mitochondria
C
Question 2: SRY is the male determining gene which is located at the tip of short arm of ?
  1. Y- chromosome
  2. X-chromosome
  3. Autosome 9
  4. Autosome 19
A
Question 3: Genes for sickle – cell anaemia and albinism make a linkage group on human chromosome ?
  1. 11
  2. 17
  3. 15
  4. 13
A
Question 4: Blue cone monochromacy is also called ?
  1. Green – blue colour blindness
  2. Yellow – blue colour blindness
  3. Red – green colour blindness
  4. Red – blue colour blindness
C
Question 5: The male grasshopper has ?
  1. 23 chromosomes
  2. 22 chromosomes
  3. 21 chromosomes
  4. 24 chromosomes
A
Question 6: Normal trichromatic colour vision is based on three different kinds of cone cells in the ?
  1. Liver
  2. Brain
  3. Skin
  4. Retina
D
Question 7: A clear picture of the genetic basis of sex determination emerged after the discovery of ?
  1. Sex chromosomes
  2. X chromosomes
  3. Y chromosomes
  4. Autosomes
A
Question 8: Human skin colour is also a quantitative trait which is controlled by ?
  1. 3 – 9 gene pairs
  2. 2 – 6 gene pairs
  3. 3 – 6 gene pairs
  4. 1 – 3 gene pairs
C
Question 9: The insulin gene is located on short arm of chromosome ?
  1. 1
  2. 2
  3. 11
  4. 22
C
Question 10: The interaction between different genes occupying different loci is ?
  1. Linkage
  2. Bombay phenotype
  3. Epistasis
  4. Pleiotropy
B
Question 11: Secretors have dominant secretor gene “Se” on chromosome ?
  1. 19
  2. 18
  3. 21
  4. 20
A
Question 12: 90% of all diabetic patients are ?
  1. Diabetes mellitus type II
  2. Diabetes mellitus type I
  3. Diabetes mellitus type IV
  4. Diabetes mellitus type III
A
Question 13: A Y-linked triat ‘SRY’ gene on Y-chromosome determines ?
  1. Deafness
  2. Maleness
  3. Femaleness
  4. Baldness
B
Question 14: Landsteiner and Levine discovered MN blood types ion man on the basis of specific antigens present on ?
  1. WBC
  2. RBC
  3. Plasma
  4. Platelets
B
Question 15: Drosophila males are ?
  1. Semizygous
  2. Homozygous
  3. Hemizygous
  4. Heterozygous
C
Question 16: Different alleles of a gene that are both expressed in a heterozygous condition are called ?
  1. Codominant
  2. Recessive
  3. Incomplete
  4. Dominant
A
Question 17: Chances for a son or daughter in human birth are ?
  1. Equal
  2. Not equal
  3. 3 : 1 between son and daughter
  4. 1 : 3 between son and daughter
A

12th Class Biology MCQs Chapter 9 Biotechnology Punjab Board

Question 1: To cure Parkinson’s disease dopamine-producing cells could be grafted directly into the ?
  1. Liver
  2. Blood
  3. Bone marrow
  4. Brain
D
Question 2: Sanford and Klein constructed a device, called the particle gun, that bombards a callus with ?
  1. DNA
  2. ATP
  3. RNA
  4. NAD
A
Question 3: The cells which cling to an egg after ovulation occurs are called ?
  1. Plethora
  2. Conglomeration
  3. Cumulus
  4. Heap
C
Question 4: Foreign genes transferred to cotton, corn and potato strains have made these plants resistant to pests because their cells now produce an insect ?
  1. Venom
  2. Toxin
  3. Poison
  4. Anti-toxin
B
Question 5: Commonly used restriction enzyme is ?
  1. RcoR1
  2. EcoR4
  3. EcoR2
  4. EcoR3
A
Question 6: It is estimated that human genome could take an encyclopedia of 200 volumes, each with ?
  1. 1000 pages
  2. 100 pages
  3. 10 pages
  4. 10000 pages
D
Question 7: In 1958 Cornell botanist F.C Steward grew a complete carrot plant from a tiny piece of ?
  1. Xylem
  2. Phloem
  3. Cortex
  4. Endodermis
B
Question 8: Meristem is ?
  1. Fungi Free
  2. Bacteria Free
  3. Pathogen Free
  4. Virus Free
D
Question 9: Today crop production is limited by effects of salinization about ?
  1. 28%
  2. 70%
  3. 50%
  4. 65%
C
Question 10: Urine is a preferable vehicle for a biotechnology product than ?
  1. Plasma
  2. Milk
  3. Blood
  4. Tissue Fluid
B
Question 11: Soybeans have been made resistant to a common ?
  1. Pesticide
  2. Fungicide
  3. Insecticide
  4. Herbicide
D
Question 12: The single stranded but complementary ends of the two DNA molecules are called ?
  1. Tacky ends
  2. Sticky ends
  3. Adhesive ends
  4. Gluey ends
B
Question 13: The DNA of bacterial viruses for example lambda phage can also be used as a ?
  1. Vector
  2. Lifter
  3. Carrier
  4. Mover
A
Question 14: One common type of vector is a ?
  1. Lysosome
  2. Mitochondria
  3. Chromosome
  4. Plasmid
D
Question 15: If each cell has the full genetic potential of the organism then it is called ?
  1. Potent
  2. Totipotent
  3. Somaclonal
  4. Genopotent
B
Question 16: EcoR1 outs double-stranded DNA when it has this sequence of bases at the ?
  1. Flanking site
  2. Joining site
  3. Cleavage site
  4. Breaking site
C
Question 17: A probe is a single stranded nucleotide sequence that will hybridize (pair) into a certain piece of ?
  1. Fatty acid
  2. Amino acid
  3. RNA
  4. DNA
D

12th Class Biology MCQs Chapter 10 Evolution Punjab Board

Question 1: An example of natural selection in action is the evolution of antibiotic resistance in ?
  1. Bacteria
  2. Man
  3. Viruses
  4. Fungi
A
Question 2: According to one of the speculations life may have begun deep in the oceans, in underwater hot springs called hydrothermal ?
  1. Apertures
  2. Outlets
  3. Vents
  4. Gaps
C
Question 3: In certain areas, such as Ecuador, forest coverage has been reduced by ?
  1. 50%
  2. 95%
  3. 67%
  4. 78%
B
Question 4: Jean Baptiste Lamarck published his theory of evolution in ?
  1. 1945
  2. 1859
  3. 1757
  4. 1809
A
Question 5: The most threatened areas on the earth, have been reduced to 44%of their original extent are ?
  1. Tropical rain forests
  2. Deciduous rain forests
  3. Carboniferous forests
  4. Temperate rain forests
A
Question 6: Endangered species of plants have been recorded to more than ?
  1. 500
  2. 200
  3. 400
  4. 300
A
Question 7: Eukaryotes are thought to have first appeared about ______________ billion years age ?
  1. 1.3
  2. 1.2
  3. 1.5
  4. 1.4
C
Question 8: A group of individuals that have the potential to interbreed in nature called ?
  1. Species
  2. Community
  3. Population
  4. Clan
A
Question 9: A respiratory protein found in all aerobic species is ?
  1. Cytochrome c
  2. Cytochrome a
  3. Cytochrome d
  4. Cytochrome b
A
Question 10: Darwin wrote a long essay on the origin of species and natural selection in ?
  1. 1858
  2. 1811
  3. 1844
  4. 1809
C
Question 11: Oldest know fossils are of ?
  1. Fungi
  2. Prokaryotes
  3. Plants
  4. Eukaryotes
B
Question 12: The idea of endosymbiont hypothesis was first proposed by ?
  1. Lamarck
  2. Schwartz
  3. Lynn Margulis
  4. Wallace
C
Question 13: The ultimate source of all changes is ?
  1. Evolution
  2. Migration
  3. Mutation
  4. Genetic drift
C
Question 14: Armadillos, the armoured mammals live only in the ?
  1. Europe
  2. America
  3. Asia
  4. Africa
B
Question 15: Flagella may have arisen through the ingestion of prokaryotes similar to spiral-shaped bacteria called ?
  1. Vibrio
  2. Spirochetes
  3. Salmonella
  4. Closteridium
B
Question 16: Emigration and immigration of members of a population cause disturbance in the ?
  1. Genetic drift
  2. Gene pool
  3. Gene tarn
  4. Genotype
B
Question 17: Hardy-Weinberg theorem, describes the frequencies of genotypes of non-evolving ?
  1. Population
  2. Family
  3. Community
  4. Species
A

12th Class Biology MCQs Chapter 11 Ecosystem Punjab Board

Question 1: The total energy from the sun is trapped by the producers in an ecosystem is about ?
  1. 10%
  2. 1%
  3. 5%
  4. 20%
B
Question 2: A group of interbreeding individuals of same species occurring together in space and time is called ?
  1. Community
  2. Clan
  3. Species
  4. Population
D
Question 3: Several bacteria in soil are able to oxidize ammonia or ammonium ions, this oxidation is known as ?
  1. Amino-oxidation
  2. Ammonification
  3. Nitrification
  4. Denitrification
C
Question 4: An association between two organisms, which brings benefit to both the organisms, is called ?
  1. Predation
  2. Symbiosis
  3. Commensalisms
  4. Parasitism
B
Question 5: Parasitism is an association between a host and a parasite, which involves providing the parasite with ?
  1. All (a), (b), (c)
  2. Food
  3. Conditions for its survival
  4. Protection
A
Question 6: A short food chain of two or three links supports a community ?
  1. More efficiently
  2. Inefficiently
  3. Less efficiently
  4. Efficiently
A
Question 7: The term ecology originally was used in 1866 by the German zoologist ?
  1. Ernst Haeckel
  2. Charles Eton
  3. Joseph Grinnell
  4. Carolus Linnaeus
A
Question 8: The term niche in ecology was first proposed by ?
  1. Ernst Haeckel
  2. Charles Eton
  3. Carolus Linnaeus
  4. Joseph Grinnell
D
Question 9: Lichens are dual organism composed of symbiotic association of algae living within a fungus ?
  1. Mizophore
  2. Sporangium
  3. Mycelium
  4. Hyphae
C
Question 10: The chemical elements essential for life in living organisms are called ?
  1. Nutrient elements
  2. Biogenic elements
  3. Genetic elements
  4. Both (a) and (b)
D
Question 11: A change in the community structure of an ecosystem over a period of time is ?
  1. Sequence
  2. Progression
  3. String
  4. Succession
D
Question 12: Biosphere is spread out over the surface of planet earth extending about ?
  1. 8/10 km
  2. 6/8 km
  3. 4/6 km
  4. 2/4 km
A
Question 13: Plants growing in xeric (dry) condition are called ?
  1. Xerophytes
  2. Derophytes
  3. Mesophytes
  4. Hydrophytes
A
Question 14: Major regional ecological community of plants and animals forms ?
  1. Biomes
  2. Biogeography
  3. Biosphere
  4. Triomes
A
Question 15: The green photosynthetic plants, which capture and bring light energy into the ecosystem are ?
  1. Consumers
  2. Producers
  3. Scanvengers
  4. Decomposers
B
Question 16: In 1917, Joseph Grinnell an American ornithologist first proposed the term niche in ?
  1. Ecology
  2. Neurology
  3. Embryology
  4. Taxonomy
A
Question 17: The solar energy used to evaporate water, heat up soil and then lost to the outer space is ?
  1. 33%
  2. 55%
  3. 99%
  4. 77%
C

12th Class Biology MCQs Chapter 12 Some Major Ecosystem Punjab Board

Question 1: While human activities are reducing the extent of many biomes, they are causing the spread of deserts, process called ?
  1. Eutrophication
  2. Acidification
  3. Desertification
  4. Corrosion
C
Question 2: Grasslands present in temperate climates are also called ?
  1. Lowland
  2. Prairies
  3. Pampas
  4. Plain
B
Question 3: The grasslands which do not have woody plants are known as ?
  1. Savanna
  2. Prairies
  3. Steppes
  4. Pampas
B
Question 4: Coniferous forests located at high altitude are called ?
  1. Alpine
  2. Both (a) and (b)
  3. Boreal
  4. Arctic
A
Question 5: The average rainfall is between 750 – 1500 mm in ?
  1. Tropical rain forests
  2. Grassland ecosystem
  3. Temperate deciduous forests
  4. Coniferous alpine and boreal forests
C
Question 6: Water is stored for use during the period of drought in fleshy stems of ?
  1. None
  2. Cacti
  3. Both (a) and (b)
  4. Euphorbia
C
Question 7: The major factor that determines the quantity and type of life in aquatic ecosystems are ?
  1. Both (a) and (b)
  2. Minerals
  3. Energy
  4. Nutrient
B
Question 8: Fresh water ecosystem covers less than ?
  1. 3%
  2. 5%
  3. 7%
  4. 1%
D
Question 9: Moderate temperature ranges from 4˚C - 30˚C in ?
  1. Temperate deciduous forests
  2. Coniferous boreal forests
  3. Tropical rain forests
  4. Coniferous alpine forests
A
Question 10: In tropical and subtropical grassland, rain reaches about ?
  1. 1500 mm
  2. 2500 mm
  3. 3000 mm
  4. 2000 mm
A
Question 11: What biome has the richest soil with nutrients and can be converted into agriculture ?
  1. Grass land
  2. Tropical rain forest
  3. Coniferous Forest
  4. Deciduous forest
D
Question 12: Open water area up to the light penetration is ?
  1. Benthic zone
  2. Littoral zone
  3. Limnetic zone
  4. Profundal zone
C
Question 13: Temperatures may be below freezing point, up to 10 ˚C in ?
  1. Desert
  2. Tropical rain forests
  3. Coniferous alpine and boreal forests
  4. Grassland ecosystem
C
Question 14: Root in plants and skeleton in animals support them on land against the force of ?
  1. Cohesion
  2. Gravity
  3. Attraction
  4. Adhesion
B
Question 15: Stipa, sporobolus, Oryzopsis are called ?
  1. Tall grasses
  2. Super grasses
  3. Short grasses
  4. Mid high grasses
D
Question 16: Annual rain fall in deserts is less than ?
  1. 15 to 25 cm
  2. 20 to 40 cm
  3. 10 to 20 cm
  4. 25 to 50 cm
D
Question 17: In sub humid tropical grassland rate of primary production is more than ?
  1. 6000 g/m²
  2. 4000 g/m²
  3. 2000 g/m²
  4. 3000 g/m²
B

12th Class Biology MCQs Chapter 13 Man and his Environment Punjab Board

Question 1: Ozone molecule is made up by binding of three atoms of ?
  1. Carbon
  2. Oxygen
  3. Hydrogen
  4. Nitrogen
B
Question 2: A layer of atmosphere extending from 10 – 50 kilometers above earth is ?
  1. Air
  2. Cloud
  3. Meteor
  4. Ozone
D
Question 3: The total water of planet earth in ocean is about ?
  1. 77%
  2. 47%
  3. 11%
  4. 97%
D
Question 4: Each nuclear power station only can last for about ?
  1. 40 years
  2. 20 years
  3. 10 years
  4. 30 years
D
Question 5: The total area of the world under cultivation is ?
  1. 11%
  2. 33%
  3. 1%
  4. 21%
A
Question 6: The study of human populations and things that affect them is called ?
  1. Chromatography
  2. Homograph
  3. Demography
  4. Calligraphy
C
Question 7: Water used for domestic / irrigation purpose is about ?
  1. 20%
  2. 10%
  3. 40%
  4. 30%
B
Question 8: In oceans, temperature at the depth of few hundred meters is only ?
  1. 35˚C
  2. 5˚C
  3. 25˚C
  4. 15˚C
B
Question 9: Soil is continuously depleting its mineral nutrients, due to vigorous ?
  1. Population explosion
  2. Deforestation
  3. Tree Production
  4. Crop production
D
Question 10: Agro-chemical are used in ?
  1. Agriculture
  2. House
  3. Industry
  4. Office
A
Question 11: The total water of planet earth present in the form of frozen ice – caps is about ?
  1. 2%
  2. 8%
  3. 4%
  4. 1 %
A
Question 12: The upper layer of earth’s crust is ?
  1. Soil
  2. Rock
  3. Clay
  4. Sand
A
Question 13: As the human population increases, there is an increased demand for ?
  1. Space
  2. Water
  3. Food
  4. Clothing
C
Question 14: At the time of independence in 1947, the population of Pakistan was ?
  1. 10 m
  2. 25.7m
  3. 20 m
  4. 32.5 m
D
Question 15: In year 2000, the population of Pakistan was around ?
  1. 100 – 110 m
  2. 150 – 160 m
  3. 210 – 220 m
  4. 120 – 130 m
B
Question 16: What is our principal source of energy ?
  1. Nuclear energy
  2. Solar energy
  3. Geothermal energy
  4. Tidal energy
B
Question 17: In oceans, especially in tropical regions, temperature of surface water is about ?
  1. 10˚C
  2. 25˚C
  3. 30˚C
  4. 15˚C
B


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