NCERT Solutions for class 7 science chapter 12

Reproduction in Plants

NCERT Solutions for Class 7 Science chapter 12 Exercise Question

Question 1

Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called ___________.
(b) A flower may have either male or female reproductive parts. Such a flower is called _______.
(c) The transfer of pollen grains from the anther to the stigma of the same or of
another flower of the same kind is known as __________.
(d) The fusion of male and female gametes is termed as ____________ .
(e) Seed dispersal takes place by means of ________ and __________.

Answer

(a) Production of new individuals from the vegetative part of parent is called vegetative reproduction
(b) A flower may have either male or female reproductive parts. Such a flower is called unisexual flower.
(c) The transfer of pollen grains from the anther to the stigma of the same or of
another flower of the same kind is known as pollination .
(d) The fusion of male and female gametes is termed as fertilization .
(e) Seed dispersal takes place by means of wind and water .

Question 2

Describe the different methods of asexual reproduction. Give examples.

Answer

The methods of asexual reproduction as follow
(a) Fragmentation: organism breaks up into two or more fragments. These fragments or pieces grow into new individuals.
(b) Spore Formation:Spores are unicellular reproductive bodies present in sporangia. When Sporangia burst single-celled thin or thick walled structures called spores are obtained. Under favorable conditions, they develop into a new plant.
(c) Budding:In yeast, The small bulb-like projection coming out from the yeast cell is called a bud. The bud gradually grows and bud gets detached from the parent cell and forms a new yeast cell.
(d) Vegetative propagation: Producing a new plant using vegetative parts of a plant like stems , leaves and root is called vegetative propagation.

Question 3

Explain what you understand by sexual reproduction.

Answer

Sexual reproduction is the process in which new organisms are form, by combining of two individuals.In this process male and female gametes fuse to form zygote. These zygotes develop into new individuals. .

Question 4

State the main difference between asexual and sexual reproduction.

Answer

Question 5

.Sketch the reproductive parts of a flower.

Answer

Question 6

Explain the difference between self-pollination and cross-pollination

Answer

Question 7

How does the process of fertilization take place in flowers?

Answer

When the pollen lands on a suitable stigma, it has to reach the female germ-cells which are in the ovary. A tube grows out of the pollen grain and travels through the style to reach the ovary, it releases the male gametes. A male gamete fuses with a female gamete in the ovule. This process is known as fertilisation

Question 8

.Describe the various ways by which seeds are dispersed.

Answer

i) By Wind: light seeds of grasses or hairy seeds of aak (Madar) and hairy fruit of sunflower get blown off with the wind
ii)By water: These fruits or seeds usually develop floating ability in the form of spongy or fibrous outer coat as in coconut
iii)By Animal : spiny seeds with hooks which get attached to the bodies of animals and are carried to distant places.

Question 9

.Match items in Column I with those in Column II

Answer

Question 10

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 the female gametes is called
(i) fertilisation (ii) pollination (iii) reproduction (iv) seed formation
c) Mature ovary forms the
(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 be reproduced by its
(i) stem (ii) leaves (iii) roots (iv) flower

Answer

(a) (iv) flower
(b) (i) fertilisation
(c) (iv) fruit
(d) (ii) bread mould
(e) (ii) leaves