NCERT Solutions for Class 7th Science
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.
Que: Name a organism which reproduces new one by budding method.
Que: Write the difference between unisexual flower and bisexual flower.
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?
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?
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.
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.