NCERT Class VII Science Solutions: Chapter 12-Reproduction in Plants Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

Fill in the blanks:

  1. Production of new individuals from the vegetative 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 ________.

Answer:

  1. Production of new individuals from the vegetative part of parent is called vegetative propagation.
  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 animal.

Question 2:

Describe the different methods of asexual reproduction. Give examples.

Answer:

The different methods of asexual reproduction:

Vegetative propagation:

  • It is a type of asexual reproduction in which new plants are produced from roots, stems, leaves and buds.
As Showing in Images is a Result for Vegetative Propagation

Budding

  • Organisms such as Hydra, a bud develops as an outgrowth at one specific site. These buds develop into tiny individuals and when fully mature, detach from the parent body and become new independent individuals.
As Showing in Images is a Result for Budding

Fragmentation

  • When water and nutrients are available algae grow and multiply rapidly and breaks up into two or more fragments. These fragments or pieces grow into new individuals.
As Showing in Images is a Result for Fragmentation

Spore formation

  • The spores are asexual reproductive bodies. Each spore is covered by a hard protective coat to withstand unfavorable conditions such as high temperature and low humidity. So they can survive for a long time. Under favorable conditions, a spore germinates and develops into a new individual.
As Showing in Images is a Spore Formation

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