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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
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Enlist advantages and disadvantages of cross pollination
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Name the two types of pollination.
What are the different adaptations shown by bird-pollinated flowers?
Pollination occurs in ______.
Which of the following is not a water pollinated plant?
Heterostyly as a contrivance for cross-pollination is found in ______.
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
