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प्रश्न
Briefly discuss any two methods by which plants avoid self-pollination.
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उत्तर
The two methods to avoid self-pollination are:
- Dichogamy - In bisexual flowers, anthers and stigma mature at different times. Due to these maturation times, self-pollination is not possible.
- Prepotency - In numerous plants, pollen grains from one flower easily germinate on the stigma of another flower that is genetically distinct, as opposed to pollen grains from the same flower. This prevents self-pollination.
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संबंधित प्रश्न
Describe the characteristic features of wind pollinated flowers.
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 ?
What are chasmogamous flowers?
Write two ways in which pollination may occur in plants.
Give one word/term for the following:
Pollination of flowers by birds.
- Nucellus
- Antipodals
- Synergids
- Micropyle
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
A botanist studying Viola (common pansy) noticed that one of the two flower types withered and developed no further due to some unfavorable condition, but the other flower type on the same plant survived and it resulted in an assured seed set. Which of the following will be correct?
Which one of the following may require pollinators, but is genetically similar to autogamy?
Choose the correct statement from the following:
