NCERT Class X Science Class: Chapter –8. How Do Organisms Reproduce? – Part-3

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Question 12:

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

(a) Filaments

(b) Hyphae

(c) Rhizoids

(d) Roots

Answer: B

Question 13:

Vegetative propagation refers to formation of new plants from

(a) Stem, roots and flowers

(b) Stem, roots and leaves

(c) Stem, flowers and fruits

(d) Stem, leaves and flowers

Answer: B

Question 14:

Factors responsible for the rapid spread of bread mould on slices of bread are

(i) Large number of spores

(ii) Availability of moisture and nutrients in bread

(iii) Presence of tubular branched hyphae

(iv) Formation of round shaped sporangia

(a) (i) and (iii)

(b) (ii) and iv)

(c) (i) and (ii)

(d) (iii) and (iv)

Answer: C

Question 15:

Length of pollen tube depends on the distance between

(a) Pollen grain and upper surface of stigma

(b) Pollen grain on upper surface of stigma and ovule

(c) Pollen grain in anther and upper surface of stigma

(d) Upper surface of stigma and lower part of style

Answer: B

Question 16:

Which of the following statements are true for flowers?

(i) Flowers are always bisexual

(ii) They are the sexual reproductive organs

(iii) They are produced in all groups of plants

(iv) After fertilization they give rise to fruits

(a) (i) and (iv)

(b) (ii) and (iii)

(c) (i) and (iii)

(d) (ii) and (iv)

Answer: D

Question 17:

Which among the following statements are true for unisexual flowers?

(i) They possess both stamen and pistil

(ii) They possess either stamen or pistil

(iii) They exhibit cross pollination

(iv) Unisexual flowers possessing only stamens cannot produce fruits

(a) (i) and (iv)

(b) (ii), (iii) and (iv)

(c) (iii) and (iv)

(d) (i), (iii) and (iv)

Answer: B