NCERT Solutions for class 7 Science Chapter-12

NCERT Solutions for class 7 Science Chapter-12

Chapter – 12   Reproduction in Plants

Chapter Exercise

Page no. – (141)

 

Q.1Fill in the blanks:-

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

 

Ans.1

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

 

 

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

 

Ans.2The 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.3Explain 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.5Sketch the reproductive parts of a flower.

 

Ans.5

Fig. 12.6

Estrella Mountain Community Collage

 

 

Q.6Explain 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.7After 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.8Describe 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:-

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

iii. Root                          iv. Flower

 

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

iii. Reproduction         iv. Seed formation

 

  1. Mature ovary forms the:-
  2. Seeds ii. Stamen

iii. Pistil                          iv. Fruit

 

  1. A spores producing plant is
  2. Rose              ii. Bread mould

iii. Potato                      iv. Seed formation

 

  1. Bryophyllum can be reproduced by its:-
  2. 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.

Also  Read

NCRET Solutions for class 7 English Poem 3 The shed

 

NCERT Solutions for class 7 Science Chapter-12 Chapter – 12   Reproduction in Plants Chapter Exercise Page no. – (141)   Q.1–…

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