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NCERT Solutions for Class 7th Science

 

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Chapter 12. Reproduction in Plants

Additional Questions With Solutions

 

 

 

12. Reproduction in Plants


Que: Write the differences between sexual and asexual method of reproduction.

Ans: Differences between sexual and asexual method of reproduction.

Sexual Reproduction : 

1. Male and female gametes participate for reproduction.

2. New plants are given rise by seeds.

3. There are found diversities in baby plants.

Asexual Reproduction : 

1. There participates only single gamete. 

2. There new plants are grown without seeds.

3. There are found less diversities in baby plants.

Que: Explain the differences between self-pollination and cross-pollination. 

Ans: The pollen of a flower lands on the stigma of the same flower it is called self – pollination, when the pollen of a flower lands on the stigma of another flower of the same plant or that of a different plant of the same kind, it is called cross-pollination. 

 

Que: What is pollination? 

Ans:The transfer of pollen from another to the stigma of a flower is called pollination. 

 

Que: What is fertilisation? 

Ans:The process of fusion of male and female gamates is called fertilisation.

Que: Name a plant which reproduces a new plant through its leaves.

Ans:Brayophillum. 

Que: Name a organism which reproduces new one by budding method.

Ans: Yeast.  

 

Que: Write the difference between unisexual flower and bisexual flower. 

Ans:

unisexual flower bisexual flower

1. It contains either only the pistil or only the stamens. 

2. Example – Papaya, and cucumber. 1. It contains both stamens and pistil.

 

2. Example – mustard, rose and petunia etc. 

Que: Name three plants in which reproduction occur by vegetative propagation.

Ans:Potato, Rose and Sugarcane. 

 

Que: What is reproduction? 

Ans:The production of new individuals from their parents is known as reproduction. 

 

Que: How does dispersal of seeds take place?

                            Or

Que: Describe the various ways by which seeds are dispersed. 

Ans: Ans:Dispersal of seeds takes place by following methods.

(i) By the air and water.

(ii) Through Insects and animals or attached to their bodies.

(iii) Bursting with sudden jerks.  

 

Que: Describe the different methods of asexual reproduction. Give examples. 

Ans:There are four different methods of asexual reproduction.

(i) Vegetative propagation: - In this the new plants are grown from vegetative parts of the plants like roots stems and leaves, since it is called Vegetative propagation. Ex: Potato, Sugarcane and rose. 

 

(ii) Budding: - In yeast, there grow small bulb like projections called buds get detached from the parent cell and grow individuals. Ex: Yeast.

 

(iii) Fragmentation – Algae grow and multiply rapidly by fragmentation. An alga breaks up into two or more fragments. Ex; Algae. 

 

(iv) Spore formation – Fungi reproduce by means of spores. A spore germinates and develops into a new individual. Ex; Fungi. 

 

Que: What is the reproductive part of a plant?

Ans:Flower. 

 

Que: What are the vegetative parts of plants?

Ans:Roots, stems and leaves.

 

Que: What are the modes of reproduction?

Ans: (i) Asexual reproduction.     (ii)  Sexual reproduction. 

 

Que: Define asexual reproduction.

Ans: Such a reproduction in which plants can give rise to new plants without seeds. 

 

Que: Define sexual reproduction.

Ans: Such a reproduction in which plants are obtained from seeds.

 

Que: Draw a labeled diagram of self pollination and cross pollination.

Ans: 

How does the process of fertilisation take place in flowers?

Ans: The cell which results after fusion of the gamates is called a zygote. The process of fusion of male and female gametes is called fertilization which takes places in ovary. The Zygote take develops into an embryo later which develops into seeds.                        

 

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