Question 1

Q1. The enzyme that synthesizes RNA primers during DNA replication is:

Accepted Answer

Option B: Primase. Primase synthesizes short RNA primers required to initiate DNA synthesis.

Question 2

Q2. The process of formation of mRNA from DNA is called:

Accepted Answer

Option B: Transcription. Transcription is synthesis of RNA using DNA template.

Question 3

Q3. In Mendelian inheritance, alleles separate during:

Accepted Answer

Option B: Gamete formation. Law of segregation states alleles separate during gamete formation.

Question 4

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

Accepted Answer

Option B: Smooth ER. Smooth ER detoxifies drugs and toxins.

Question 5

Q5. The correct base pairing rule in DNA is:

Accepted Answer

Option C: A–T, G–C. A pairs with T, G pairs with C via hydrogen bonds.

Question 6

Q6. A cross between two heterozygous tall plants (Tt × Tt) gives phenotypic ratio:

Accepted Answer

Option A: 3:1. Monohybrid cross gives 3 tall : 1 dwarf ratio.

Question 7

Q7. The site of fertilization in humans is:

Accepted Answer

Option C: Ampulla of fallopian tube. Fertilization occurs in ampullary region of oviduct.

Question 8

Q8. Which ecosystem has the highest primary productivity?

Accepted Answer

Option C: Tropical rainforest. Warm, wet conditions support maximum photosynthesis.

Question 9

Q9. Restriction enzymes are used to:

Accepted Answer

Option B: Cut DNA at specific sites. They recognize palindromic sequences and cut DNA.

Question 10

Q10. The molecule that carries amino acids to ribosomes is:

Accepted Answer

Option B: tRNA. tRNA brings specific amino acids during translation.

Question 11

Q11. Copper-T prevents pregnancy mainly by:

Accepted Answer

Option B: Preventing implantation. It creates uterine conditions unsuitable for implantation.

Question 12

Q12. HIV primarily infects:

Accepted Answer

Option C: Helper T cells. HIV destroys CD4+ helper T cells.

Question 13

Q13. Only 10% energy is transferred between trophic levels because:

Accepted Answer

Option B: Energy is lost as heat. Energy is lost during respiration and metabolic activities.

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. Confirmed by Meselson-Stahl experiment.

Question 15

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

Accepted Answer

Option B: A false R true. Drift is stronger in small populations.

Question 16

Q16. Case Study: A farmer uses Bt cotton which shows resistance to pests. What is the reason?

Accepted Answer

Option B: Cry toxin production. Bt gene produces insecticidal Cry protein.

Question 17

Q17. Case Study: A patient shows excessive thirst, urination, and high blood sugar. Which condition is likely?

Accepted Answer

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

Question 18

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

Accepted Answer

Option C: Completely linked. No recombination indicates tight linkage.

Question 19

Q19. In Hardy-Weinberg equilibrium, if p = 0.6, q² equals:

Accepted Answer

Option A: 0.16. q = 0.4 → q² = 0.16

Question 20

Q20. Highest biodiversity is found in:

Accepted Answer

Option C: Tropical rainforest. Stable climate supports maximum species diversity.

Mock Test 10 Performance Solutions

Detailed Question Analysis

Q1. The enzyme that synthesizes RNA primers during DNA replication is:

Q2. The process of formation of mRNA from DNA is called:

Q3. In Mendelian inheritance, alleles separate during:

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

Q5. The correct base pairing rule in DNA is:

Q6. A cross between two heterozygous tall plants (Tt \(\times\) Tt) gives phenotypic ratio:

Q7. The site of fertilization in humans is:

Q8. Which ecosystem has the highest primary productivity?

Q9. Restriction enzymes are used to:

Q10. The molecule that carries amino acids to ribosomes is:

Q11. Copper-T prevents pregnancy mainly by:

Q12. HIV primarily infects:

Q13. Only 10% energy is transferred between trophic levels because:

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 more significant in large populations. Reason (R): Random changes affect small populations more.

Q16. Case Study: A farmer uses Bt cotton which shows resistance to pests. What is the reason?

Q17. Case Study: A patient shows excessive thirst, urination, and high blood sugar. Which condition is likely?

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

Q19. In Hardy-Weinberg equilibrium, if p = 0.6, q² equals:

Q20. Highest biodiversity is found in:

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Mock Test 10 Performance Solutions

Detailed Question Analysis

Q1. The enzyme that synthesizes RNA primers during DNA replication is:

Q2. The process of formation of mRNA from DNA is called:

Q3. In Mendelian inheritance, alleles separate during:

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

Q5. The correct base pairing rule in DNA is:

Q6. A cross between two heterozygous tall plants (Tt \(\times\) Tt) gives phenotypic ratio:

Q7. The site of fertilization in humans is:

Q8. Which ecosystem has the highest primary productivity?

Q9. Restriction enzymes are used to:

Q10. The molecule that carries amino acids to ribosomes is:

Q11. Copper-T prevents pregnancy mainly by:

Q12. HIV primarily infects:

Q13. Only 10% energy is transferred between trophic levels because:

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 more significant in large populations. Reason (R): Random changes affect small populations more.

Q16. Case Study: A farmer uses Bt cotton which shows resistance to pests. What is the reason?

Q17. Case Study: A patient shows excessive thirst, urination, and high blood sugar. Which condition is likely?

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

Q19. In Hardy-Weinberg equilibrium, if p = 0.6, q² equals:

Q20. Highest biodiversity is found in:

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