NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants

Exercises

Question:- 1. 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 reproduction.

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

(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 fertilization

(e) Seed dispersal takes place by means of wind, water and animal.

Question:- 2. Describe the different methods of asexual reproduction. Give examples.

Answer:- The following are some examples of asexual reproductive methods:

Vegetative Propagation:- In this asexual reproduction, new plants are created from roots, stems, leaves and buds of the existing plant. Examples – Tuber of potato, the rhizome of ginger.

Budding:-  The bud is a tiny projection that expands and separates from the parent cell, resulting in the formation of a new yeast cell. The newly formed yeast cell develops, matures, and multiplies. Example – Yeast.

Fragmentation:- The development and multiplication in this way of reproduction is accomplished by rapidly breaking down into two or more fragments. When water and nutrients are available, each piece develops into a new individual. Example – Algae

Spore Formation:- This reproduction is carried out by spores, which germinate and develop into a new person in the presence of favourable conditions. Examples – Fungi like Rhizopus, Mucor, etc.

Fission:- It’s an asexual reproduction method in which a single-celled creature splits into two to generate new organisms. There are two types of fission which are

• Binary fission
• Multiple fission

Examples:- Unicellular organisms that undergo binary fission are amoeba, paramecium, Leishmania etc.

Plasmodium undergoes the process of multiple fission.

Question:- 3. Explain what you understand by sexual reproduction.

Answer:- Sexual reproduction is a method where both male and female gametes fuse to form a new individual. Male and female reproductive organs in plants are stamens and pistils which bear the anthers and ovary respectively.

Question:- 4. State the main difference between asexual and sexual reproduction.

Answer:-