NCERT Solutions for Class 7 Science Chapter 12

Reproduction in Plants Class 7

Chapter 12 Reproduction in Plants Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 141

Q1 :  

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 propagation__.

(b) A flower may have either male or female reproductive parts. Such a flower is called __unisexual__.

(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 __fertilisation__.

(e) Seed dispersal takes place by means of __wind__, __water__ and __animals__.

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Q2 :  

Describe the different methods of asexual reproduction. Give examples.


Answer :

The various modes of asexual reproduction in plants are as follows:

(i)Vegetative propagation: It is the ability of a plant to produce new plants from roots, stems, leaves, and buds. Vegetative propagation is divided into two types.

• Natural vegetative propagation: This type of vegetative propagation occurs easily in nature and involves simple vegetative parts. Potato plant sprouting from an eye is a common example.

• Artificial vegetative propagation: This type of vegetative propagation is performed manually and generally occurs in laboratory conditions. The formation of a complete plant from a stem cutting of rose is a common example of this method.

(ii) Budding:It involves the formation of a new individual from a bulb-like projection called a bud. The bud grows and gets detached from the parent to form a new individual. It is commonly observed in yeast.

(iii)Fragmentation:It is a form of asexual reproduction where a new organism is formed from the fragments of the parent body. It is the only mode of asexual reproduction in Spirogyra.

(iv)Spore formation:Many non-flowering plants reproduce through spore formation. Spores are tiny cells protected by a thick wall. Fungi such as bread moulds reproduce asexually using this method.

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Q3 :  

Explain what you understand by sexual reproduction.


Answer :

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Q4 :  

State the main difference between asexual and sexual reproduction.


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Q5 :  

Explain the difference between self-pollination and cross-pollination.


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Q6 :  

How does the process of fertilisation take place in flowers?


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Q7 :  

Describe the various ways by which seeds are dispersed.


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Q8 :  

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


Answer :

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Q9 :  

Tick (∠Å¡ ) 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

(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 reproduce by its

(i) stem

(ii) leaves

(iii) roots

(iv) flower


Answer :

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<< Previous Chapter 11 : Transportation in Animals andk Plants Next Chapter 13 : Motion and Time >>

Science : CBSE NCERT Exercise Solutions for Class 7th for Reproduction in Plants will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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