Question 1

Q1. Which enzyme is responsible for relieving tension ahead of the replication fork?

Accepted Answer

Option B: Topoisomerase. Topoisomerase (DNA gyrase in prokaryotes) prevents excessive supercoiling during DNA unwinding.

Question 2

Q2. The functional unit of heredity is:

Accepted Answer

Option B: Gene. A gene is a segment of DNA that codes for a functional product.

Question 3

Q3. Which stage of meiosis is responsible for separation of homologous chromosomes?

Accepted Answer

Option C: Anaphase I. Homologous chromosomes separate during Anaphase I, reducing chromosome number.

Question 4

Q4. The site of photosynthesis in chloroplast is:

Accepted Answer

Option B: Grana. Light reactions occur in grana (thylakoid membranes).

Question 5

Q5. Which blood component is responsible for clotting?

Accepted Answer

Option C: Platelets. Platelets release clotting factors forming a blood clot.

Question 6

Q6. A cross between Aa × Aa produces genotype ratio:

Accepted Answer

Option B: 1:2:1. Monohybrid cross gives 1 homozygous dominant : 2 heterozygous : 1 homozygous recessive.

Question 7

Q7. During transcription, RNA polymerase binds to:

Accepted Answer

Option B: Promoter. Promoter region initiates transcription.

Question 8

Q8. Which ecosystem has highest productivity?

Accepted Answer

Option C: Tropical rainforest. Warm, humid conditions support high primary productivity.

Question 9

Q9. The vector commonly used in gene cloning is:

Accepted Answer

Option B: Plasmid. Plasmids are circular DNA used as cloning vectors.

Question 10

Q10. The anticodon is present on:

Accepted Answer

Option C: tRNA. tRNA carries anticodon complementary to mRNA codon.

Question 11

Q11. Barrier method of contraception includes:

Accepted Answer

Option C: Condom. Condom physically prevents sperm entry.

Question 12

Q12. Malaria is transmitted by:

Accepted Answer

Option B: Female Anopheles mosquito. Female Anopheles transmits Plasmodium parasite.

Question 13

Q13. The 10% law in ecology refers to:

Accepted Answer

Option A: Energy loss at each trophic level. Only ~10% energy is transferred to next trophic level.

Question 14

Q14. Assertion (A): DNA replication is semiconservative. Reason (R): Each daughter DNA has one parental and one new strand.

Accepted Answer

Option A: Both true and R explains A. Meselson-Stahl experiment confirmed semiconservative replication.

Question 15

Q15. Assertion (A): Genetic drift is significant in large populations. Reason (R): Random fluctuations affect allele frequency more in small populations.

Accepted Answer

Option B: A false R true. Drift is stronger in small populations, not large ones.

Question 16

Q16. Case Study: A farmer observes pest-resistant cotton crop after inserting Bt gene. What is the main function of Bt gene?

Accepted Answer

Option B: Produce toxin against insects. Bt toxin kills specific insect larvae.

Question 17

Q17. Case Study: A patient has high blood glucose and frequent urination. What hormone is deficient?

Accepted Answer

Option B: Insulin. Insulin regulates blood glucose levels.

Question 18

Q18. If recombination frequency is high between two genes, they are:

Accepted Answer

Option B: Far apart or unlinked. High recombination indicates genes are far apart or on different chromosomes.

Question 19

Q19. In Hardy-Weinberg equilibrium, if q² = 0.25, p is:

Accepted Answer

Option C: 0.75. q = 0.5 → p = 1 - 0.5 = 0.5 (Wait correction needed) ✔ Correct Answer: B (0.5) Solution: q² = 0.25 → q = 0.5 → p = 0.5

Question 20

Q20. Speciation is most likely to occur when:

Accepted Answer

Option B: Population is isolated. Isolation prevents gene flow, leading to divergence and speciation.

Mock Test 09 Performance Solutions

Detailed Question Analysis

Q1. Which enzyme is responsible for relieving tension ahead of the replication fork?

Q2. The functional unit of heredity is:

Q3. Which stage of meiosis is responsible for separation of homologous chromosomes?

Q4. The site of photosynthesis in chloroplast is:

Q5. Which blood component is responsible for clotting?

Q6. A cross between Aa \(\times\) Aa produces genotype ratio:

Q7. During transcription, RNA polymerase binds to:

Q8. Which ecosystem has highest productivity?

Q9. The vector commonly used in gene cloning is:

Q10. The anticodon is present on:

Q11. Barrier method of contraception includes:

Q12. Malaria is transmitted by:

Q13. The 10% law in ecology refers to:

Q14. Assertion (A): DNA replication is semiconservative. Reason (R): Each daughter DNA has one parental and one new strand.

Q15. Assertion (A): Genetic drift is significant in large populations. Reason (R): Random fluctuations affect allele frequency more in small populations.

Q16. Case Study: A farmer observes pest-resistant cotton crop after inserting Bt gene. What is the main function of Bt gene?

Q17. Case Study: A patient has high blood glucose and frequent urination. What hormone is deficient?

Q18. If recombination frequency is high between two genes, they are:

Q19. In Hardy-Weinberg equilibrium, if q² = 0.25, p is:

Q20. Speciation is most likely to occur when:

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Mock Test 09 Performance Solutions

Detailed Question Analysis

Q1. Which enzyme is responsible for relieving tension ahead of the replication fork?

Q2. The functional unit of heredity is:

Q3. Which stage of meiosis is responsible for separation of homologous chromosomes?

Q4. The site of photosynthesis in chloroplast is:

Q5. Which blood component is responsible for clotting?

Q6. A cross between Aa \(\times\) Aa produces genotype ratio:

Q7. During transcription, RNA polymerase binds to:

Q8. Which ecosystem has highest productivity?

Q9. The vector commonly used in gene cloning is:

Q10. The anticodon is present on:

Q11. Barrier method of contraception includes:

Q12. Malaria is transmitted by:

Q13. The 10% law in ecology refers to:

Q14. Assertion (A): DNA replication is semiconservative. Reason (R): Each daughter DNA has one parental and one new strand.

Q15. Assertion (A): Genetic drift is significant in large populations. Reason (R): Random fluctuations affect allele frequency more in small populations.

Q16. Case Study: A farmer observes pest-resistant cotton crop after inserting Bt gene. What is the main function of Bt gene?

Q17. Case Study: A patient has high blood glucose and frequent urination. What hormone is deficient?

Q18. If recombination frequency is high between two genes, they are:

Q19. In Hardy-Weinberg equilibrium, if q² = 0.25, p is:

Q20. Speciation is most likely to occur when:

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