Heredity and Evolution Class 10 MCQs with Answers
Heredity and Evolution – MCQs with Answers & Explanations
Class: 10 | Subject: Science (Biology)
Section: Heredity and Evolution
Based on NCERT & CBSE Board Examination Pattern
Section: Heredity and Evolution
Based on NCERT & CBSE Board Examination Pattern
1. Transmission of traits from parents to offspring is called:
Answer: B. Heredity
Heredity ensures passing of genetic traits through genes located on chromosomes.
Heredity ensures passing of genetic traits through genes located on chromosomes.
2. The functional unit of heredity is:
Answer: B. Gene
Genes are DNA segments that code for specific traits.
Genes are DNA segments that code for specific traits.
3. Mendel conducted experiments on:
Answer: B. Pea plant
Pea plants showed clear contrasting traits useful for genetic study.
Pea plants showed clear contrasting traits useful for genetic study.
4. Dominant trait is expressed in:
Answer: B. Heterozygous also
Dominant alleles express even when Mendel's contrasting allele is present.
Dominant alleles express even when Mendel's contrasting allele is present.
5. TT represents:
Answer: B. Homozygous dominant
Both alleles are dominant for the trait.
Both alleles are dominant for the trait.
6. F1 generation of monohybrid cross shows ratio:
Answer: C. All dominant
F1 hybrids express dominant trait only.
F1 hybrids express dominant trait only.
7. 3:1 ratio appears in:
Answer: A. F2 monohybrid
Phenotypic ratio of dominant to recessive is 3:1.
Phenotypic ratio of dominant to recessive is 3:1.
8. Sex of child depends on:
Answer: B. Father
Father contributes X or Y chromosome determining sex.
Father contributes X or Y chromosome determining sex.
9. XX represents:
Answer: B. Female
Females have two X chromosomes.
Females have two X chromosomes.
10. Variation arises due to:
Answer: A. DNA copying errors
Small replication mistakes create variations.
Small replication mistakes create variations.
11. Evolution means:
Answer: C.
Evolution is gradual accumulation of variations.
Evolution is gradual accumulation of variations.
12. Fossils are:
Answer: B.
Fossils provide evidence of past life.
Fossils provide evidence of past life.
13. Archaeopteryx is link between:
Answer: B.
Shows reptilian and avian features.
Shows reptilian and avian features.
14. Homologous organs indicate:
Answer: B.
Same structure, different function → common origin.
Same structure, different function → common origin.
15. Analogous organs indicate:
Answer: B.
Example: Wings of birds & insects.
Example: Wings of birds & insects.
16. Speciation occurs due to:
Answer: A.
Geographical isolation leads to new species.
Geographical isolation leads to new species.
17. Acquired traits are:
Answer: B.
They occur during lifetime and are not genetic.
They occur during lifetime and are not genetic.
18. Charles Darwin proposed:
Answer: B.
Survival of the fittest drives evolution.
Survival of the fittest drives evolution.
19. Genetic material is:
Answer: B.
DNA stores hereditary information.
DNA stores hereditary information.
20. Evolution is supported by:
Answer: D.
Multiple evidences support evolutionary theory.
Multiple evidences support evolutionary theory.