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In angiosperms the eggs?
- a)Completely surrounded by a wall
- b)Surrounded by a wall only at the micropylar end
- c)Surrounded by a wall only at the chalazae end
- d)Devoid of wall
Correct answer is option 'B'. Can you explain this answer?
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In angiosperms the eggs?a)Completely surrounded by a wallb)Surrounded ...
The egg cell remains morphologically similar to the syner- gids until cell wall ingrowths form at the micropylar pole of the two synergids, forming the distinctive filiform apparatus in- growths that identify these cells as synergids.
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In angiosperms the eggs?a)Completely surrounded by a wallb)Surrounded ...
Understanding the Structure of Angiosperm Eggs
In angiosperms, the reproductive process involves unique structures that facilitate fertilization. The eggs, specifically, have a distinct feature regarding their surrounding layers.
Egg Wall Structure
- The egg cell in angiosperms is located within the ovule.
- It is surrounded by a protective wall, but this wall is not uniform throughout; it is primarily found at one end.
Micropylar End
- The wall is more pronounced at the micropylar end. This end is where the pollen tube enters during fertilization.
- The presence of a wall at this end provides structural support and protection, ensuring that the egg remains viable for fertilization.
Chalazal End
- At the chalazal end, the wall is either absent or much less developed. This allows for the easier passage of nutrients and signaling molecules from the surrounding tissues, facilitating the development of the embryo post-fertilization.
Conclusion
- Thus, the correct answer is option B: "Surrounded by a wall only at the micropylar end." This structure is crucial for the fertilization process, allowing the pollen to effectively reach the egg while providing necessary protection.
Understanding these features is vital for comprehending the reproductive strategies of angiosperms, which are the most diverse group of plants on Earth.
In angiosperms, the reproductive process involves unique structures that facilitate fertilization. The eggs, specifically, have a distinct feature regarding their surrounding layers.
Egg Wall Structure
- The egg cell in angiosperms is located within the ovule.
- It is surrounded by a protective wall, but this wall is not uniform throughout; it is primarily found at one end.
Micropylar End
- The wall is more pronounced at the micropylar end. This end is where the pollen tube enters during fertilization.
- The presence of a wall at this end provides structural support and protection, ensuring that the egg remains viable for fertilization.
Chalazal End
- At the chalazal end, the wall is either absent or much less developed. This allows for the easier passage of nutrients and signaling molecules from the surrounding tissues, facilitating the development of the embryo post-fertilization.
Conclusion
- Thus, the correct answer is option B: "Surrounded by a wall only at the micropylar end." This structure is crucial for the fertilization process, allowing the pollen to effectively reach the egg while providing necessary protection.
Understanding these features is vital for comprehending the reproductive strategies of angiosperms, which are the most diverse group of plants on Earth.
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In angiosperms the eggs?a)Completely surrounded by a wallb)Surrounded by a wall only at the micropylar endc)Surrounded by a wall only at the chalazae endd)Devoid of wallCorrect answer is option 'B'. Can you explain this answer?
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