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Biology

Sexual Reproduction in Flowering Plants

Which among t...

Question

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

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Solution

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

Unisexual flowers have either male or female sexual organ. Therefore, they cannot self-pollinate and, thus, show cross-pollination. The ovary of the female organ develops into a fruit after fertilisation, therefore flowers having stamens cannot produce fruits.

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Similar questions

Question 17
Which of the following statements are true about 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)

Q. Which of the following statements are true for flowers?
(i) flowers are always bisexual
(ii) they contain sexual reproductive organs
(iii) they are produced in all groups of plants
(iv) after fertilisation they give rise to fruits

(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Question 16
Which of the following statements are true about 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)

Tick (√ ) the correct answer:

(a) The reproductive part of a plant is the

(i) leaf

(ii) stem

(iii) root

(iv) flower

(b) The process of fusion of the male and female gametes is called

(i) fertilisation

(ii) pollination

(iii) reproduction

(iv) seed formation

(i) seed

(ii) stamen

(iii) pistil

(iv) fruit

(d) A spore producing plant is

(i) rose

(ii) bread mould

(iii) potato

(iv) ginger

(e) Bryophyllum can reproduce by its

(i) stem

(ii) leaves

(iii) roots

(iv) flower

Q. Match the columns and find the correct option.

	I		II
(a)	Pistils fuse together	(i)	Gametogenesis
(b)	Formation of gametes	(ii)	Pistillate
(c)	Hyphae of higher ascomycetes	(iii)	Syncarpous
(d)	Unisexual female flower	(iv)	Dikaryotic

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(b) (ii), (iii) and (iv) Unisexual flowers have either male or female sexual organ. Therefore, they cannot self-pollinate and, thus, show cross-pollination. The ovary of the female organ develops into a fruit after fertilisation, therefore flowers having stamens cannot produce fruits.

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

Unisexual flowers have either male or female sexual organ. Therefore, they cannot self-pollinate and, thus, show cross-pollination. The ovary of the female organ develops into a fruit after fertilisation, therefore flowers having stamens cannot produce fruits.