Draw and explain self and cross pollination. Also explain how can pollination help Brighamia insignis from becoming an extinct plant. Plz give answer in fast plz
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Answer:
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Answer:
hope it will help you
Explanation:
Pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same or another flower. It is said to be the first process of sexual fertilization in flowering plants. Pollen grains contain the male gamete and are present in the anthers of the flower.Types of Pollination
Pollination can be of two types:
Self- Pollination
Cross-Pollination
Let us understand more about each type of pollination a little in detail.
Self- Pollination
When the pollen is transferred from the anthers of a flower to the stigma of the same flower, it is called as self- pollination. This form of pollination is common in hermaphrodite or dioecious plants which contain both male and female sexual parts on the same flower.
In self-pollinating plants, there is less dependence on the external factors to cause pollination. These plants depend on wind or other smaller insects that visit the flower regularly. In self- pollinating flowers, the anthers, and stigma are of similar lengths to facilitate the transfer of pollen. Self – pollination can be further divided into two types:
Autogamy– In this type of self-pollination, the pollen is transferred from the anthers of one flower to the stigma of the same flower.
Geitonogamy– In this type of self- pollination, the anthers are transferred from the anthers of one flower to the stigma of another flower but on the same plant.
Advantages of self – pollination
In self- pollination, there is no diversity in the genes and therefore the purity of the race is maintained.
The plants do not depend on external factors for pollination and even smaller quantities of pollen grains produce have a good success rate in getting pollinated.
Self- pollination ensures that recessive characters are eliminated.
Disadvantages of self- pollination
Since there is no mixing up of genes, there are no new characters or features that are introduced into the lineage of the offsprings.
Self- pollination is said to reduce the vigor and vitality of the race as there are no new features introduced.
Without new characters introduced, the resultant offsprings’ immunity to diseases reduces.
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Biology > Sexual Reproduction in Flowering Plants > Pollination
Sexual Reproduction in Flowering Plants
Pollination
Pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same or another flower. It is said to be the first process of sexual fertilization in flowering plants. Pollen grains contain the male gamete and are present in the anthers of the flower.
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Types of Pollination
Pollination can be of two types:
Self- Pollination
Cross-Pollination
Let us understand more about each type of pollination a little in detail.
Self- Pollination
Pollination
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When the pollen is transferred from the anthers of a flower to the stigma of the same flower, it is called as self- pollination. This form of pollination is common in hermaphrodite or dioecious plants which contain both male and female sexual parts on the same flower.
In self-pollinating plants, there is less dependence on the external factors to cause pollination. These plants depend on wind or other smaller insects that visit the flower regularly. In self- pollinating flowers, the anthers, and stigma are of similar lengths to facilitate the transfer of pollen. Self – pollination can be further divided into two types:
Autogamy– In this type of self-pollination, the pollen is transferred from the anthers of one flower to the stigma of the same flower.
Geitonogamy– In this type of self- pollination, the anthers are transferred from the anthers of one flower to the stigma of another flower but on the same plant.
Advantages of self – pollination
In self- pollination, there is no diversity in the genes and therefore the purity of the race is maintained.
The plants do not depend on external factors for pollination and even smaller quantities of pollen grains produce have a good success rate in getting pollinated.
Self- pollination ensures that recessive characters are eliminated.
Disadvantages of self- pollination
Since there is no mixing up of genes, there are no new characters or features that are introduced into the lineage of the offsprings.
Self- pollination is said to reduce the vigor and vitality of the race as there are no new features introduced.
Without new characters introduced, the resultant offsprings’ immunity to diseases reduces.
Cross-Pollination
In this type of pollination, the pollen is transferred from the anthers of one flower to the stigma of another flower. In this case, the two flowers are genetically different from each other. Cross-pollination is always dependant on another agent to cause the transfer of pollen. The agents of pollination include birds, animals, water, wind, and insects.
