Wednesday, 3 April 2019

PPSC UPSC SSC Biology Objective Multiple Choice Questions Answers

Biology Objective Multiple Choice General Knowledge Questions & Answers for PPSC, CSS, NTS, OTS, MCAT, MBBS, SSC, CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services and many more exams. All biology general knowledge objective questions answers mcq are important in ssc, upsc, ibps and competitive examination and entrance tests.

Solved MCQS Objective Biology PPSC
PPSC Biology MCQs


Question 1: Deficiency of ----------- causes yellowing in plants ?

  1. Magnesium
  2. Iron
  3. Chlorine
  4. Oxygen

A

Question 2: Molecular formula of chlorophyll ‘a’ molecule is--------- ?

  1. C55H72O5N4Mg
  2. C55H70O6N4Mg
  3. C50H72O6N4Mg
  4. C55H70O5N4Mg

A

Question 3: Haemoglobin can be almost completely oxygenated by an oxygen pressure of ---------- of mercury ?

  1. 10 mm
  2. 60 mm
  3. 10 cm
  4. 100 mm

D

Question 4: When abdomen expands, the number of spiracles open is----------- ?

  1. 2
  2. 3
  3. 6
  4. 8

D

Question 5: Secondary cell wall of sclerenchyma cells is impregnated with---------- ?

  1. Cellulose.
  2. Peptidoglycan and murein.
  3. Lignin.
  4. Pectin.

C

Question 6: The contraction of which of the following muscle fibers, is controlled by hormones ?

  1. A smooth muscle
  2. A cardiac muscle
  3. A skeletal muscle.
  4. All of these

A

Question 7: Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction ?

  1. Binding sites of actin get attached to the myosin head.
  2. Troponin uncovers the actin binding sites.
  3. Tropomyosin gets removed from the binding sites of actin filaments.
  4. Ca2+ goes back inside sarcoplasmic reticulum.

C

Question 8: The membrane of vacuoles is known as--------- ?

  1. Vacuoloplast
  2. Tonoplast
  3. Tanoplast
  4. All of these

B

Question 9: Lenticular transpiration is ----------- of total transpiration ?

  1. 2-3%
  2. 1-3%
  3. 1-4%
  4. 1-2%

D

Question 10: ---------- function as multisensory hydraulic valve ?

  1. Lenticels
  2. Guard cells
  3. Hydathods
  4. All of these

B

Question 11: Which of the following represents osmoregulatory steps taken by hydrophytes ?

  1. Increases transpiration by increasing the surface area of the leave.
  2. Small and thick leaves to decrease the surface area proportional to the volume of the leave.
  3. Stomata closing in sufficient supply, and opening in restricted supply of water.
  4. None of these

A

Question 12: The distal blind end of the malpighian tubules bathes freely in---------- ?

  1. Digestive tract
  2. Intestines
  3. Haemocoel
  4. Coelom

C

Question 13: Which of the following mechanism explains development of anemia in Renal failure ?

  1. Failure of bone marrow is accompanied with renal failure.
  2. Destruction of RBC results from accumulated urea in the blood.
  3. Chronicity of the disease is respobsible for anemia
  4. Failure of proper RBC synthesis, due to lack of chemical stimulation.

D

Question 14: Nephrostome in earthworm opens in---------- ?

  1. External space
  2. Internal Body cavity
  3. In gut
  4. In Bladder

B

Question 15: Centric discoid form of diatoms is-------- ?

  1. Diplaneis
  2. Coscinodiscus
  3. Camphyloneiscus
  4. Stephanodis

B

Question 16: During the process of cell division which of the following divides first ?

  1. cytodplasm
  2. vacuoles
  3. mitochondria
  4. nucleus

D

Question 17: Animals living in the three trunks are known as--------- ?

  1. Arboreal
  2. Volant
  3. Amphibious
  4. Aquaticx

A

Question 18: The scientific study of livings is called ?

  1. Anatomy
  2. Biology
  3. Geology
  4. Zoology

B

Question 19: The molecules of living matter that provide building blocks are mostly based on ?

  1. Carbon
  2. Nitrogen
  3. Hydrogen
  4. Ammonia

A

Question 20: The first antibiotic to be discovered was---------- ?

  1. Penicillin
  2. Cephalosporin
  3. Amino glycosides
  4. Erythromycin

A

Question 21: In animals coordination is achieved by means of ?

  1. Nervous system
  2. Endocrine system
  3. Respiratory system
  4. Both A and B

D

Question 22: Protein factory is---------- ?

  1. nucleus
  2. ribosome
  3. golgi complex
  4. centriole

B

Question 23: The number of species of organisms currently known to science is ?

  1. 3500000
  2. 35000
  3. 2500000
  4. 25000000

C

Question 24: enzyme is-------- ?

  1. bio catalyst
  2. hormone
  3. Gland
  4. None of these

A

Question 25: If a man having blood group AB marries a woman who is heterozygous for blood group, what is the probability of their first child having blood group B ?

  1. 40%
  2. 45%
  3. 50%
  4. 71%

C

Question 26: A group of similar cells that perform a specific function is ?

  1. Organ
  2. Tissues
  3. Organelle
  4. Organ System

B

Question 27: In plants there are-------basic types of tissues ?

  1. 2
  2. 3
  3. 4
  4. None of these

D

Question 28: In which phase of cell cycle cell organelles are formed ?

  1. S Phase
  2. G1 Phase
  3. G2 Phase
  4. G0 Phase

C

Question 29: Golden brown colour of diatoms is due to presence of-------- ?

  1. Mycoxanthin, mucoxanthin and myxoxanthophylls
  2. Alpha and beta carotenes and myxoxanthin
  3. Fucoxanthin, diatoxanthin, diadinoxanthin
  4. None of the above

C

Question 30: Centric discoid form of diatoms is-------- ?

  1. Diplaneis
  2. Coscinodiscus
  3. Camphyloneiscus
  4. Stephanodis

B

Question 31: In many which phylum the body of an organisms is usually divided in there regions called head, thorax and abdomen ?

  1. Arthropods
  2. Chordata
  3. Annelida
  4. Echinodermata

A

Question 32: The phylum chrordata comprise about how many species ?

  1. 25,000
  2. 50,000
  3. 100,000
  4. 10,00,000

B

Question 33: Mammalian kidney, under restricted water supply can conserve water by over -------- % reabsorption of glomerular filtrate ?

  1. 80.50%
  2. 90.50%
  3. 95.50%
  4. 99.50%

D

Question 34: Which of the vascular channels are related to Juxtramedullary nephrous only ?

  1. Afferent and efferent arterioles
  2. Peritubualr capillaries
  3. Vasa nervosa
  4. Vasa recta

D

Question 35: Which of the following mechanism explains development of anemia in Renal failure ?

  1. Failure of bone marrow is accompanied with renal failure.
  2. Destruction of RBC results from accumulated urea in the blood.
  3. Chronicity of the disease is respobsible for anemia
  4. Failure of proper RBC synthesis, due to lack of chemical stimulation.

D

Question 36: Thermostat of human body is present in--------- ?

  1. Fore brain
  2. Hind Brain
  3. Thalamus
  4. Hypothalamus

D

Question 37: Excessive lactic acid is converted into ---------- by liver ?

  1. Glucose
  2. Fructose
  3. Sucrose
  4. Glycogen

D

Question 38: Which of the following excretory structure is associated with gut of the organism ?

  1. Protonephridium
  2. Metanephridium
  3. Malpighian tubules
  4. Nephrons

C

Question 39: Fishes, most of the invertebrates and amphibians are examples of -------- animals ?

  1. Endotherms
  2. Ectotherms
  3. Heterotherms
  4. Homeotherms

B

Question 40: Stomata open due to --------- of K+ into the guard cells from the surrounding epidermis ?

  1. Diffusion
  2. Active transport
  3. Osmosis
  4. All of these

B

Question 41: All of the follwing are blood clots except:---------- ?

  1. Thrombus
  2. Embolus
  3. Atheroma
  4. Hematoma

C

Question 42: --------- component of cell wall has grreat affinity with water ?

  1. Lignin
  2. Cellulose
  3. Pectin
  4. All of these

D

Question 43: The membrane of vacuoles is known as--------- ?

  1. Vacuoloplast
  2. Tonoplast
  3. Tanoplast
  4. All of these

B

Question 44: Which of the following statement about fatigue is correct ?

  1. The major event in it is accumulation of lactic acid.
  2. Lactic acid accumulation turns pH in acidic range leading to muscle ache.
  3. Ionic imbalance may also cause it.
  4. All of these

D

Question 45: Which one of the following forms the blk of exoskeleton of an arthropod ?

  1. Epicuticle
  2. Procuticle
  3. Ectocuticle
  4. None of these

B

Question 46: Ecdysone is--------------- ?

  1. An enzyme that digest endocuticle during an arthropodal ecdysis
  2. A newly formed exoskeleton in authropods
  3. A hormone that regulates moulting in arthropods
  4. A process that involves moulting

C

Question 47: Thylakoids in chloroplasts are stacked into-------- ?

  1. Grana
  2. Stroma
  3. Nucleus
  4. None of these

A

Question 48: Which of the following light is least absorbed by the plants ?

  1. Orange
  2. Red
  3. Blue
  4. Green

D

Question 49: At which times there is no net gaseous exchange between leaves and the atmosphere ?

  1. Day time.
  2. Night time.
  3. Dawn & Dusk.
  4. Mid night.

C

Question 50: Which of the following is second largest part of the brain--------- ?

  1. Cerebrum
  2. Cerebellum
  3. Thalamus
  4. Hypothalamus

B