Class 7 Science - Chapter Reproduction in Plants NCERT Solutions | Explain the difference between self-poll
Explain the difference between self-pollination and cross-pollination.
Pollination is the transfer of pollen grains from the anther to the stigma of the flower which can be achieved by biotic (insects, birds etc.) and abiotic (wind, water etc.) pollinating agents. On the basis of pollinating mechanism, plants can be grouped into two mating systems: self- pollinated and cross- pollinated.
| Self- Pollination | Cross Pollination |
| 1. The pollen grain moves to the female part of the same flower or different flower of the same plant species. | 1. The pollen grains are transferred to the flower present on the different plant. |
| 2. Transfer to the same flower is autogamy; and to another flower on the same plant is geitonogamy. | 2. Cross- pollination is also known as allogamy. |
| 3. No genetic variation occurs. | 3. High genetic variation are found. |
| 4. Identical species are created, i.e. no new species are formed. | 4. New species are formed. |
| 5. Transfer of pollen grains are limited. | 5. Transfer of pollen grains unlimited, i.e. in large amount. |
More Questions From Class 7 Science - Chapter Reproduction in Plants
- Q:-
Sketch the reproductive parts of a flower.
- Q:-
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 - Q:-
Describe the various ways by which seeds are dispersed.
- Q:-
How does the process of fertilisation take place in flowers?
- Q:-
Describe the different methods of asexual reproduction. Give examples.
- Q:-
Explain what you understand by sexual reproduction.
- Q:-
State the main difference between asexual and sexual reproduction.
- Q:-
Tick 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 the 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 - Q:-
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 _____________.
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Column I Column II
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(vi) Motion of a train on a straight bridge. - Q:-
Why do organisms need to take food?
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