Explain the difference between self-poll | Class 7 Science Chapter Reproduction in Plants, Reproduction in Plants NCERT Solutions

Question:

Explain the difference between self-pollination and cross-pollination.

Answer:

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. 

 


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Welcome to the NCERT Solutions for Class 7 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 6: Explain the difference between self-pollination and cross-pollination.....