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In angiosperms all the four microspores of tetrad are covered by a layer which is formed by
[2002]
- a)pectocellulose
- b)callose
- c)cellulose
- d)sporopollenin
Correct answer is option 'B'. Can you explain this answer?
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In angiosperms all the four microspores of tetrad are covered by a lay...
The deposition of callose starts in pollen mother cell as it enters meiosis and is complete by the end of first meiotic division. By the time tetrad are formed, the common callose wall dissolves; even then all the four micro-spores lie within a common callose wall.
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In angiosperms all the four microspores of tetrad are covered by a lay...
The layer that covers all four microspores of tetrad in angiosperms is formed by callose. This is an important layer as it serves to protect the developing pollen grains from various environmental factors and pathogens.
Formation of Callose Layer:
Callose is a complex polysaccharide that is formed by the polymerization of glucose monomers. The callose layer is formed by the deposition of this polysaccharide on the inner wall of the microsporangium, which surrounds the developing pollen grains.
Functions of Callose Layer:
The callose layer has several important functions in the development of pollen grains in angiosperms. Some of these functions are:
1. Protection: The callose layer provides protection to the developing pollen grains from various environmental factors like UV radiation, temperature fluctuations, and desiccation.
2. Pathogen Defense: The callose layer also plays a role in defending the developing pollen grains from pathogens like bacteria, fungi, and viruses.
3. Nutrient Supply: The callose layer facilitates the transport of nutrients from the tapetum to the developing pollen grains.
4. Pollen Release: The callose layer also plays a role in the release of mature pollen grains from the microsporangium.
Conclusion:
In conclusion, the callose layer is an important layer that protects the developing pollen grains and facilitates their development in angiosperms.
Formation of Callose Layer:
Callose is a complex polysaccharide that is formed by the polymerization of glucose monomers. The callose layer is formed by the deposition of this polysaccharide on the inner wall of the microsporangium, which surrounds the developing pollen grains.
Functions of Callose Layer:
The callose layer has several important functions in the development of pollen grains in angiosperms. Some of these functions are:
1. Protection: The callose layer provides protection to the developing pollen grains from various environmental factors like UV radiation, temperature fluctuations, and desiccation.
2. Pathogen Defense: The callose layer also plays a role in defending the developing pollen grains from pathogens like bacteria, fungi, and viruses.
3. Nutrient Supply: The callose layer facilitates the transport of nutrients from the tapetum to the developing pollen grains.
4. Pollen Release: The callose layer also plays a role in the release of mature pollen grains from the microsporangium.
Conclusion:
In conclusion, the callose layer is an important layer that protects the developing pollen grains and facilitates their development in angiosperms.
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In angiosperms all the four microspores of tetrad are covered by a layer which is formed by[2002]a)pectocelluloseb)callosec)cellulosed)sporopolleninCorrect answer is option 'B'. Can you explain this answer?
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