|Biology MCQs List|
12th Class Biology MCQs With Answers List
Q.1: The fossil fuels are ?
- All a,b and c
Q.2: The number of human spinal nerves is ?
Q.3: If all members of a population are homozygous for the same allele that allele is said to be ?
- Multiple allele
- Jumping gene
- Fixed in the gene
- Perfect gene
Q.4: What would be expected to happen if all the nitrogen-fixing organisms ceased to exist ?
- There would be no significant change in number of animals
- The total number of biomass would be reduced
- All organisms would die out
- The nitrogen level of the atmosphere would be increase
Q.5: Bats and humming bird are called ?
Q.6: A pesticide is a chemical which destroys agricultural ?
- Both a And b
Q.7: Imprinting is best known in birds such as ?
- All a,b,and c
Q.8: Which one of the fllowing acts as a stop codon ?
Q.9: Which one is Tall grass ?
- Both a And b
Q.10: In nature P 730 to P 660 conversion occurs in the ?
Q.11: At cytokinesis in plants a membrane structure phragmoplast is formed from vesicles which originate from ?
- Golgi complex
Q.12: The remodeling of bone is a function of which cells ?
- Chondrocytes and asteocytes
- Osteoblasts and osteoclasts
- Chondroblasts and osteoclasts
- Chondroblasts and osteocytes
Q.13: The decline in thickness of the ozone layer is caused by increasing level of ?
- Carbon dioxide
Q.14: If an mRNA is synthesized with the differnt codons, what is the minimum number of amino acids in the protein that is formed by the mRNA ?
- 64 Amino acids
- 62 Amino acids
- 60 Amino acids
- None of them
Q.15: In addition to auxin which hormone also play important role in apical domince ?
- Abcesic acid
Q.16: Genes that code for therapeutic and diagnostic proteins are incorporated into the animal's DNA and the proteins appear in the animal's ?
Q.17: The number of linkage group in man is ?
Q.18: Air is being polluted rapidly due to ?
- Both a And b
Q.19: The parts of the body used extensively to cope with the environment become larger and stronger while those that are not used deteriorate was argued by ?
- Charles Drawin
- Alfred Wallace
- Carolus Linnaeus
- J.B Lamarck
Q.20: At the time of independence in 1947 the population of pakistan was ?
- 10 m
- 20 m
- 25.7 m
- 32.5 m
Q.21: A form of air pollution in which airbone acids produced by electric utility plants and other sources fall to Earth in distant regions is ?
- Acid rain
- Basic rain
- Heavy rain
Q.22: Oxytocin is secreted by the endocrine gland named ?
- Pituitary gland
- Thyroid gland
- Parathyroid gland
- Adrenal gland
Q.23: Effect of photoperiodism was first studied in 1920 by ?
- Darwin And Francis
- Garner And Allard
- Linnaeus And Lamarck
- Walson And Crick
Q.24: The uterine layer which is shed with each monthly cycle is ?
- Tunica albuginea
Q.25: PastYourQuestionWhich statement defines the net primary production in an ecosystem over a given time periodHere ?
- The total amount of organic matter in the plants in excess of that used in respiration
- The total amount of organic matter used in respiration by all the organisms present
- The total amount of photosynthesis product from all plants
- The total amount of organic matter in all organisms present