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The diagram shows 3 different species of pollen grains as they appear under a microscope. The diagrams are all on the same scale.
Which pollen grains are involved in insect pollination?
(A.) 1 and 2
(B.) 2 and 3
(C.) 2 only
(D.) all of them
Correct Answer: (A.) 1 and 2
Explanation:
The characteristics of pollen produced by insect-pollinated flowers are:
(i) Insect-pollinated flowers produce a smaller amount of pollen.
(ii) These pollens are larger in size and heavier in weight.
(iii) These pollens contain spikes or hooks on their surface to provide a grip to stick to insects.
The characteristics of pollen produced by wind-pollinated flowers are:
(i) Wind-pollinated flowers produce an enormous amount of pollen.
(ii) These pollens are smaller in size and lighter in weight.
(iii) These pollens have a smooth surface.
Pollen grains are the microscopic, sticky, powdery structures present in the pollen. It contains the male reproductive cells of a plant. The pollen grain is a small body that can be of different sizes and shapes. It is made in the male structures' anther, which is part of the stamen, and moved by wind, water, insects, etc. to the female structures, where fertilization happens.
The process of transferring pollen grains from the anther to the stigma of a flower is known as pollination. Examples of pollinating agents are wind, water, birds, insects, etc.
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