Chapter Exam

Chapter 6: Evolution — Online MCQ Test

Q: Who proposed the theory of inheritance of acquired characters?

Answer: B. Jean-Baptiste Lamarck — Lamarck proposed that traits acquired during an organism's lifetime can be passed to offspring. This idea is called Lamarckism.

Q: The Hardy-Weinberg principle is used to study:

Answer: B. Genetic equilibrium in populations — The Hardy-Weinberg principle states that allele frequencies remain constant in a population under ideal conditions. It is used to study genetic equilibrium.

Q: Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

Answer: C. Natural selection — Natural selection changes allele frequencies, so it disrupts Hardy-Weinberg equilibrium. The other options are conditions that help maintain equilibrium.

Q: A population has 81% individuals with the dominant phenotype and 19% with the recessive phenotype. If the population is in Hardy-Weinberg equilibrium, the frequency of the recessive allele is:

Answer: B. 0.30 — The recessive phenotype frequency is q² = 0.19. So q = √0.19 ≈ 0.435, but since options are rounded, the best matching value is 0.43.

ZOOLOGY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 6: Evolution with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th ZOOLOGY. This chapter covers: This chapter traces the origin of life evolutionary theories including Lamarckism and Darwinism Hardy-Weinberg principle adaptive radiation and human evolutionary history.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Evolution — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th ZOOLOGY — Chapter 6: Evolution, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who proposed the theory of inheritance of acquired characters?

A. Charles Darwin
B. Jean-Baptiste Lamarck ✓
C. Hugo de Vries
D. August Weismann

Answer: B. Jean-Baptiste Lamarck
Lamarck proposed that traits acquired during an organism's lifetime can be passed to offspring. This idea is called Lamarckism.

The Hardy-Weinberg principle is used to study:

A. Protein synthesis
B. Genetic equilibrium in populations ✓
C. Digestion in organisms
D. Cell division

Answer: B. Genetic equilibrium in populations
The Hardy-Weinberg principle states that allele frequencies remain constant in a population under ideal conditions. It is used to study genetic equilibrium.

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

A. No mutation
B. Random mating
C. Natural selection ✓
D. No migration

Answer: C. Natural selection
Natural selection changes allele frequencies, so it disrupts Hardy-Weinberg equilibrium. The other options are conditions that help maintain equilibrium.

A population has 81% individuals with the dominant phenotype and 19% with the recessive phenotype. If the population is in Hardy-Weinberg equilibrium, the frequency of the recessive allele is:

A. 0.19
B. 0.30 ✓
C. 0.43
D. 0.57

Answer: B. 0.30
The recessive phenotype frequency is q² = 0.19. So q = √0.19 ≈ 0.435, but since options are rounded, the best matching value is 0.43.

Which statement is correct regarding adaptive radiation?

A. It involves the evolution of unrelated species with similar structures
B. It is the diversification of a common ancestor into several species adapted to different habitats ✓
C. It always occurs due to mutation alone
D. It refers to the extinction of species in a lineage

Answer: B. It is the diversification of a common ancestor into several species adapted to different habitats
Adaptive radiation is the rapid diversification of one ancestral species into many species, each adapted to a different ecological niche.