1. A zygote which has an X-chromosome inherited from the father will develop into a ?

either boy or girl

X-chromosome does not influence the sex of a child

girl

boy

Answer: girl

Explanation:


2. What does the progeny of a tall plant with round seeds and a short plant with wrinkled seeds look like ?

All are short with wrinkled seeds.

All are tall with round seeds.

All are tall with wrinkled seeds.

All are short with round seeds.

Answer: All are tall with round seeds.

Explanation:


3. Which one of the following pairs are homologous organs ?

Wings of a bat and wings of a cockroach.

Forelimbs of a bird and wings of a bat.

Pectoral fins of a fish and forelimbs of a horse.

Wings of a bird and wings of a butterfly.

Answer: Forelimbs of a bird and wings of a bat.

Explanation:


4. The sex of a child is determined by which of the following ?

The presence of and X chromosome in an ovum

The presence of a Y chromosome in a sperm

The length of time between ovulation and copulation

The length of the mother’s pregnancy

Answer: The presence of a Y chromosome in a sperm

Explanation:


5. When an individual is having both the alleles of contrasting characters it is said to be ?

Linked genes

Monoecious

Heterozygous

Dioecious

Answer: Heterozygous

Explanation:


6. Forelimb of frog, lizard, bird and man has some evolutionary relationship. This are ?

Hand relationship

Analogous organs

Homologous organs

Missing links

Answer: Homologous organs

Explanation:


7. Those organs which have different basic structure but have similar appearance and perform similar functions are called ?

Vestigial organs

Homologous organs

Analogous organs

None of these

Answer: Analogous organs

Explanation:


8. A man with blood group A marries a woman having blood group O. What will be the blood group of the child ?

A only

AB

Equal chance of acquiring blood group A or blood group O.

O only

Answer: Equal chance of acquiring blood group A or blood group O.

Explanation:


9. Which of the following decides the sex of the child ?

female gamete, i.e., ovum

mother

male gamete, i.e., sperm

both sperm and ovum

Answer: male gamete, i.e., sperm

Explanation:


10. The theory of evolution of species by natural selection was given by ?

Weismann

Lamarck

Darwin

Mendel

Answer: Darwin

Explanation: