Chapter Exam

Chapter 8: Heredity and Evolution — Online MCQ Test

Q: Genes are located on:

Answer: B. chromosomes — Genes are segments of DNA present on chromosomes inside the cell nucleus.

Q: If a pure tall pea plant is crossed with a pure dwarf pea plant, the F1 generation will be:

Answer: A. all tall — Tallness is dominant, so all F1 plants with genotype Tt will appear tall.

Q: In a dihybrid cross between two heterozygous pea plants for round/yellow seeds, the F2 phenotypic ratio is:

Answer: C. 9 : 3 : 3 : 1 — A dihybrid cross shows independent inheritance of two pairs of traits, giving a 9 : 3 : 3 : 1 ratio in F2.

SCIENCE · CLASS 10th · Karnataka State Board

Practice Chapter 8: Heredity and Evolution with a free chapter-wise online MCQ test for Karnataka State Board CLASS 10th SCIENCE. This chapter covers: Mendel Inheritance Traits Genes Chromosomes Dominant Recessive Sex determination Variation Evolution Natural selection Speciation. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8: Heredity and Evolution — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 10th SCIENCE — Chapter 8: Heredity and Evolution, with answers and explanations. These are sample questions; the exam has its own separate question set.

Heredity refers to the:

A. transfer of characters from parents to offspring ✓
B. change in body size due to exercise
C. formation of fossils in rocks
D. movement of organisms from one place to another

Answer: A. transfer of characters from parents to offspring
Heredity is the transmission of traits from one generation to the next through genetic material.

Genes are located on:

A. ribosomes
B. chromosomes ✓
C. cell wall
D. vacuoles

Answer: B. chromosomes
Genes are segments of DNA present on chromosomes inside the cell nucleus.

If a pure tall pea plant is crossed with a pure dwarf pea plant, the F1 generation will be:

A. all tall ✓
B. all dwarf
C. half tall and half dwarf
D. one-fourth dwarf

Answer: A. all tall
Tallness is dominant, so all F1 plants with genotype Tt will appear tall.

In a dihybrid cross between two heterozygous pea plants for round/yellow seeds, the F2 phenotypic ratio is:

A. 3 : 1
B. 1 : 2 : 1
C. 9 : 3 : 3 : 1 ✓
D. 1 : 1 : 1 : 1

Answer: C. 9 : 3 : 3 : 1
A dihybrid cross shows independent inheritance of two pairs of traits, giving a 9 : 3 : 3 : 1 ratio in F2.

Which statement about evolution is most accurate according to NCERT?

A. Evolution always produces organisms that are superior to older organisms
B. Evolution is a ladder in which humans are the final goal
C. Evolution produces organisms adapted to their environments, not necessarily more advanced ✓
D. Evolution stops when complex organisms appear

Answer: C. Evolution produces organisms adapted to their environments, not necessarily more advanced
Evolution is not a ladder of progress; it results in organisms becoming better suited to particular environments.