NCERT Class X Science Class: Chapter –8. How Do Organisms Reproduce? – Part-4

Download PDF of This Page (Size: 285K)

Question 18:

Which among the following statements are true for sexual reproduction in flowering plants?

(i) It requires two types of gametes

(ii) Fertilization is a compulsory event

(iii) It always results in formation of zygote

(iv) Off spring formed are clones

(a) (i) and (iv)

(b) (i), (ii) and (iv)

(c) (i), (ii) and (iii)

(d) (i), (ii) and (iv)

Answer: C

Question 19:

In Figure, the parts A, B and C are sequentially

Image parts A, B and C are sequentially

Image Parts a, B and C Are Sequentially

Image parts A, B and C are sequentially

(a) Cotyledon, Plumage and Radicle

(b) Plumage, Radicle and Cotyledon

(c) Plumage, Cotyledon and Radicle

(d) Radicle, Cotyledon and Plumage

Answer: C

Image part plumage, Cotyledon and Radicle

Image Part Plumage, Cotyledon and Radicle

Image part plumage, Cotyledon and Radicle

Question 20:

Off spring formed as a result of sexual reproduction exhibit more variations because

(a) Sexual reproduction is a lengthy process

(b) Genetic material comes from two parents of the same species

(c) Genetic material comes from two parents of different species

(d) Genetic material comes from many parents

Answer: B

Image sexual reproduction

Image Sexual Reproduction

Image sexual reproduction

Question 21:

Reproduction is essential for living organisms in order to

(a) Keep the individual organism alive

(b) Fulfill their energy requirement

(c) Maintain growth

(d) Continue the species generation after generation

Answer: D

Question 22:

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys

(a) Loss of milk teeth

(b) Increase in height

(c) Cracking of voice

(d) Weight gain

Answer: C

Image Adam's apple

Image Adam's Apple

Image Adam's apple

Question 23:

In human females, an event that reflects onset of reproductive phase is

(a) Growth of body

(b) Changes in hair pattern

(c) Change in voice

(d) Menstruation

Answer: D