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प्रश्न
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
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उत्तर
Cross-pollination cannot occur in cleistogamous flowers. Cleistogamous flowers do not open at all. In these flowers, the anthers and stigma are close together; when the anthers dehisce in the flower buds, pollen grains touch the stigma, resulting in pollination. As a result, these flowers are always self-pollinated since they remain closed, and cross pollen cannot land on the stigma. Cleistogamous flowers can pollinate and set seeds without pollinators.
APPEARS IN
संबंधित प्रश्न
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
List the different types of pollination depending upon the source of pollen gain.
Why angiosperm anthers are called dithecous?
Enlist advantages and disadvantages of cross pollination
Describe the structure of its microsporangium.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
What are the different adaptations shown by bird-pollinated flowers?
Give an account of any two biotic agents for pollination along with their adaptations.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Chief pollinators of agricultural crops are ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Feathery stigma occurs in ______.
Which of the following is not a water pollinated plant?
Triple fusion in Capsella bursa pastoris is fusion of male gamete with ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
Advantage of cleistogamy is:
Autogamy can occur in a chasmogamous flower if ______.
What is ornithophily?
Pollination in water lilies is carried out by ______.
What is epihydrophily?
Give any four floral adaptations for chiropterophily.
Name the following:
Aquatic plants which are anemophilous.
Briefly discuss any two methods by which plants avoid self-pollination.
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.
When and why does a plant breeder employ the emasculation technique?
