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प्रश्न
State the sporopollenin significance with reference to its chemical nature.
उत्तर
It is one of the most resistant organic substances and can withstand high temperature, strong acids and alkali. No enzyme that degrades sporopollenin is so far known. This sporopollenin helps the pollen grain to be well preserved.
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संबंधित प्रश्न
A flower of brinjal plant following the process of sexual reproduction produces 360 viable seeds.
Answer the following questions giving reasons:
(a) How many ovules are minimally involved?
(b) How many megaspore mother cells are involved?
(c) What is the minimum number of pollen grains that must land on stigma for pollination?
(d) How many male gametes are involved in the above case?
(e) How many microspore mother cells must have undergone reduction division prior to dehiscence of anther in the above case?
How are ‘pollen banks’ useful?
Pollen grains can be stored in liquid nitrogen at ______.
When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as ______.
Point out the odd one.
Fertilization involving carrying of male gametes by pollen tube is ______.
Several pollen grains form a unit designated as pollinium in Family ______.
When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as ______.
Lateral conjugation in Spirogyra takes place in the cells of ______.
What is the function of germ pores?
