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प्रश्न
What are the different adaptations shown by bird-pollinated flowers?
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उत्तर
Ornithophilous plants shows the following adaptations:
- Flowers are usually brightly coloured, large, and showy.
- They secrete profuse, dilute nectar.
- Pollen grains are sticky and spiny.
- Flowers are generally without fragrance, as birds have a poor sense of smell.
संबंधित प्रश्न
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?
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
What is the bagging technique?
Enlist advantages and disadvantages of cross pollination
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
- Nucellus
- Antipodals
- Synergids
- Micropyle
Describe pollination. How many types of pollinations are found?
When and why does a plant breeder employ the emasculation technique?
