Solution - Pre-fertilisation - Structures and Events - Pollination



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Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.


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(a) As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure (s) that shall ensure cross – pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each of the item.

(b) Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.

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Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.

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A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.

Answer the following questions giving reasons :

(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?

(b) What would have been the minimum number of ovules present in the ovary?

(c) How many megaspore mother cells were involved?

(d) What is the minimum number of microspore mother cells involved in the above case?

(e) How many male gametes were involved in this case?

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Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?

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Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.

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Solution for concept: Pre-fertilisation - Structures and Events - Pollination. For the courses 12th CBSE (Arts), 12th CBSE (Commerce), 12th CBSE (Science)