NCERT Solutions for class 7 Science Chapter-12

Chapter – 12 Reproduction in Plants

Chapter Exercise

Page no. – (141)

Q.1– Fill in the blanks:-

Production of new individuals from the vegetation part of parent is called ____.
A flower may have either male or female reproductive parts. Such a flower is called ____.
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 ____.
The fusion of male and female gametes is termed as ____.
Seed dispersal takes place by means of ____, ____ and ____.

Ans.1–

Production of new individuals from the vegetation part of parent is called __vegetative reproduction__.
A flower may have either male or female reproductive parts. Such a flower is called __unisexual flower__.
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__.
The fusion of male and female gametes is termed as __fertilization__.
Seed dispersal takes place by means of __wind__, __water__ and __animals__.

Q.2– Describe the different methods of asexual reproduction. Give example.

Ans.2– The various methods of asexual reproduction are:-

Fragmentation:- The body of the organism breaks up into two parts and each grows into a new filament and then forming two organism from single organism.
Budding:– In the budding process, small bulb – like projection coming out from the yeast cell is called bud. Now, gradually growing and gets detached from the parent to form a new individual.
Vegetative propagation:– In this process, a plant can produce new plants from vegetative parts of the plant.

Q.3– Explain what you understand by sexual reproduction.

Ans.3– A sexual reproduction is a method in plants where male and female gamete fuse together and form a zygote. The zygote gradually divides to form a new organism.

Q.4– State the main difference between asexual and sexual reproduction.

Ans.4–

S. No.	Asexual reproduction	Sexual reproduction
1.	It only required single parent	It required both male and female parents
2.	No need of Seeds	Need of seeds
3.	In this process, No gametes formation takes place	In this process, Gametes are formed
4.	Ex. Jasmine and yeast etc.	Ex. Animals and Insects.

Q.5– Sketch the reproductive parts of a flower.

Ans.5–

Fig. 12.6

Estrella Mountain Community Collage

Q.6– Explain Difference between self – pollination and cross – pollination.

Ans.6–

S. no.	Self – pollination	Cross – pollination
1.	It occurs in bisexual plants having anther and stigma maturing at the same time	It occurs in bisexual plants having anther and stigma maturing at the different time
2.	Pollen grains are transferred from the anther to the stigma of the same flower.	Pollen grains are transferred from the anther of one flower to the stigma of another flower of the same kind.

Q.7– How does the process of fertilisation take place in flowers?

Ans.7– After pollination, Pollen grain lands on the stigma of the flower, the pollen tube generate and runs down the style to female gamete. The grain fertilizer the female gamete and form a zygote. The fusion of male and female gametes is known as fertilization.

Q.8– Describe the various ways by which seeds are dispersed.

Ans.8– Following are the various ways by which seeds are dispersed:-

Dispersed by wind:- The winds carries away seeds that are usually small in size and have hairs or wings – like structures.
Dispersed by animals:- The Spiny seeds with hooks which get attached to the bodies of animals and are carried to various and long places.
Dispersed by water:- Some aquatic plants like near water has seeds that can float and carried away by water.

Q.9– Match items in column I with those in column II:-

Column I		Column II
a.	Bud	i.	Maple
b.	Eyes	ii.	Spirogyra
c.	Fragmentation	iii.	Yeast
d.	Wings	iv.	Bread mould
e.	Spores	v.	Potato
		vi	Rose

Ans.9–

Column I		Column II
a.	Bud	iii.	Yeast
b.	Eyes	v.	Potato
c.	Fragmentation	ii.	Spirogyra
d.	Wings	i.	Maple
e.	Spores	iv.	Bread mould

Q.10– Tick () The Correct answer:-

The reproductive part of a plant is the:-
Leaf. ii. Steam

iii. Root iv. Flower

The process of the fusion of the male and the female gametes is called:-
Fertilisation ii. Pollination

iii. Reproduction iv. Seed formation

Mature ovary forms the:-
Seeds ii. Stamen

iii. Pistil iv. Fruit

A spores producing plant is
Rose ii. Bread mould

iii. Potato iv. Seed formation

Bryophyllum can be reproduced by its:-
Stem ii. Leaves

iii. Roots vi. Flower

Ans.10–

a.- iv. Flower.

b.- i. Fertilization.

c.- iv. Fruit.

d.- ii. Bread mould.

e.- ii. Leaves.