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प्रश्न
Give four adaptations shown by flowers pollinated by wind.
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उत्तर
Adaptation for wind-pollination or anemophily :
(i) Flowers small inconspicuous.
(ii) Calyx, corolla reduced or absent.
(iii) Flowers colourless, nectarless or odourless.
(iv) Flowers produced above and before the foliage, in case of unisexual flowers, male flowers are abundant to compensate for the loss and to ensure the pollination.
(v) Stamens and stigma (feathery) exserted and well exposed.
(vi) Pollen grains, light, small, dusty, non-sticky or winged (Pinus).
(vii) Pollen grains dry and unwettable, e.g., maize, grasses, Urtica.
(viii) The number of ovules very less, often single. (any four points)
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संबंधित प्रश्न
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 one of them.
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?
Mention two strategies that evolved to prevent self-pollination in flowers.
Mention any two contrivances in flowers which favour cross-pollination.
For which of the following attractants and rewards are required?
Autogamy can occur in a chasmogamous flower if ______.
Feathery stigma occurs in ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Correct definition of pollination is ______
What is hypohydrophily?
