Question 1

Q1. Which enzyme adds nucleotides to the growing DNA strand during replication?

Accepted Answer

Option B: DNA polymerase III. DNA polymerase III catalyzes addition of nucleotides in 5'→3' direction during replication.

Question 2

Q2. The genetic material of most viruses is:

Accepted Answer

Option C: Either DNA or RNA. Viruses may have DNA or RNA as genetic material, never both.

Question 3

Q3. The correct order of taxonomic hierarchy is:

Accepted Answer

Option D: Order → Family → Genus → Species. Hierarchy goes from broader to specific: Order → Family → Genus → Species.

Question 4

Q4. Which organelle is responsible for detoxification in liver cells?

Accepted Answer

Option B: Smooth endoplasmic reticulum. SER detoxifies drugs and harmful substances in liver cells.

Question 5

Q5. The Hardy-Weinberg equation is:

Accepted Answer

Option C: p² + 2pq + q² = 1. It represents genotype frequencies in equilibrium population.

Question 6

Q6. A tall plant crossed with dwarf plant gives only tall offspring. The genotype of tall parent is:

Accepted Answer

Option C: TT. Only homozygous dominant (TT) produces all tall offspring.

Question 7

Q7. During meiosis, reduction in chromosome number occurs in:

Accepted Answer

Option C: Anaphase I. Separation of homologous chromosomes occurs in Anaphase I.

Question 8

Q8. Which ecosystem has inverted pyramid of biomass?

Accepted Answer

Option C: Pond. Aquatic ecosystems may show inverted biomass pyramid due to phytoplankton turnover.

Question 9

Q9. Which tool is used to cut DNA at specific sites?

Accepted Answer

Option B: Restriction enzyme. Restriction enzymes cut DNA at palindromic sequences.

Question 10

Q10. The molecule that carries genetic code from nucleus to cytoplasm is:

Accepted Answer

Option C: mRNA. mRNA carries coded information for protein synthesis.

Question 11

Q11. Vasectomy is a method of contraception that:

Accepted Answer

Option B: Blocks sperm transport. Vasectomy blocks vas deferens to stop sperm flow.

Question 12

Q12. The causative agent of malaria is:

Accepted Answer

Option C: Protozoan. Plasmodium is a protozoan parasite transmitted by female Anopheles mosquito.

Question 13

Q13. Biomagnification is maximum at:

Accepted Answer

Option D: Top carnivores. Toxic substances accumulate at highest concentration at top trophic levels.

Question 14

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

Accepted Answer

Option A: Both true and R explains A. Each DNA molecule retains one parental strand.

Question 15

Q15. Assertion (A): Genetic drift is stronger in large populations. Reason (R): Random changes affect small populations more significantly.

Accepted Answer

Option B: A false R true. Genetic drift is significant in small populations.

Question 16

Q16. Case Study: A person shows inability to produce insulin leading to high blood glucose. What condition is observed?

Accepted Answer

Option A: Diabetes mellitus. Insulin deficiency causes diabetes mellitus.

Question 17

Q17. Case Study: In Bt cotton, pests die after feeding on plant tissues. Reason:

Accepted Answer

Option B: Plant produces Cry toxin. Bt gene produces Cry toxin harmful to insects.

Question 18

Q18. If recombination frequency is 0%, genes are:

Accepted Answer

Option C: Completely linked. 0% recombination indicates complete linkage.

Question 19

Q19. If p = 0.5 in Hardy-Weinberg equilibrium, heterozygous frequency is:

Accepted Answer

Option B: 0.50. 2pq = 2(0.5)(0.5) = 0.5

Question 20

Q20. The highest rate of speciation occurs in:

Accepted Answer

Option B: Isolated populations. Geographical isolation increases speciation rate.

Mock Test 08 Performance Solutions

Detailed Question Analysis

Q1. Which enzyme adds nucleotides to the growing DNA strand during replication?

Q2. The genetic material of most viruses is:

Q3. The correct order of taxonomic hierarchy is:

Q4. Which organelle is responsible for detoxification in liver cells?

Q5. The Hardy-Weinberg equation is:

Q6. A tall plant crossed with dwarf plant gives only tall offspring. The genotype of tall parent is:

Q7. During meiosis, reduction in chromosome number occurs in:

Q8. Which ecosystem has inverted pyramid of biomass?

Q9. Which tool is used to cut DNA at specific sites?

Q10. The molecule that carries genetic code from nucleus to cytoplasm is:

Q11. Vasectomy is a method of contraception that:

Q12. The causative agent of malaria is:

Q13. Biomagnification is maximum at:

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

Q15. Assertion (A): Genetic drift is stronger in large populations. Reason (R): Random changes affect small populations more significantly.

Q16. Case Study: A person shows inability to produce insulin leading to high blood glucose. What condition is observed?

Q17. Case Study: In Bt cotton, pests die after feeding on plant tissues. Reason:

Q18. If recombination frequency is 0%, genes are:

Q19. If p = 0.5 in Hardy-Weinberg equilibrium, heterozygous frequency is:

Q20. The highest rate of speciation occurs in:

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Mock Test 08 Performance Solutions

Detailed Question Analysis

Q1. Which enzyme adds nucleotides to the growing DNA strand during replication?

Q2. The genetic material of most viruses is:

Q3. The correct order of taxonomic hierarchy is:

Q4. Which organelle is responsible for detoxification in liver cells?

Q5. The Hardy-Weinberg equation is:

Q6. A tall plant crossed with dwarf plant gives only tall offspring. The genotype of tall parent is:

Q7. During meiosis, reduction in chromosome number occurs in:

Q8. Which ecosystem has inverted pyramid of biomass?

Q9. Which tool is used to cut DNA at specific sites?

Q10. The molecule that carries genetic code from nucleus to cytoplasm is:

Q11. Vasectomy is a method of contraception that:

Q12. The causative agent of malaria is:

Q13. Biomagnification is maximum at:

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

Q15. Assertion (A): Genetic drift is stronger in large populations. Reason (R): Random changes affect small populations more significantly.

Q16. Case Study: A person shows inability to produce insulin leading to high blood glucose. What condition is observed?

Q17. Case Study: In Bt cotton, pests die after feeding on plant tissues. Reason:

Q18. If recombination frequency is 0%, genes are:

Q19. If p = 0.5 in Hardy-Weinberg equilibrium, heterozygous frequency is:

Q20. The highest rate of speciation occurs in:

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