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In a fertilised ovule, n, 2n and 3n conditions occur respectively in
- a)Antipodal, egg and endosperm.
- b)Egg, nucellus and endosperm.
- c)Endosperm, nucellus and egg.
- d)Antipodals, synergids and integuments.
Correct answer is option 'B'. Can you explain this answer?
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In a fertilised ovule, n, 2n and 3n conditions occur respectively ina)...
In a fertilised ovule, n, 2n and 3n conditions occur respectively in egg, nucellus and endosperm.
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In a fertilised ovule, n, 2n and 3n conditions occur respectively ina)...
Explanation:
In a fertilized ovule, different ploidy conditions occur in different parts of the ovule. The correct answer is option 'B' which states that the n, 2n, and 3n conditions occur respectively in the egg, nucellus, and endosperm.
Explanation of the options:
a) Antipodal, egg, and endosperm: The antipodal cells are formed during the development of the embryo sac and they are haploid (n) in nature. The egg cell is also haploid (n) as it is derived from the haploid megaspore. The endosperm, on the other hand, is triploid (3n) as it is formed by the fusion of the sperm cell (n) with the two polar nuclei (2n). So, option 'a' is incorrect.
b) Egg, nucellus, and endosperm: The egg cell is haploid (n) as mentioned earlier. The nucellus is a part of the ovule that surrounds the embryo sac and it is haploid (n) in nature. The endosperm is triploid (3n) as it is formed by the fusion of the sperm cell (n) with the two polar nuclei (2n). So, option 'b' is correct.
c) Endosperm, nucellus, and egg: The endosperm is triploid (3n) as mentioned earlier. The nucellus is haploid (n) in nature. The egg cell is also haploid (n) as it is derived from the haploid megaspore. So, option 'c' is incorrect.
d) Antipodals, synergids, and integuments: The antipodal cells are haploid (n) as mentioned earlier. The synergids are also haploid (n) in nature. The integuments are diploid (2n) as they are derived from the diploid ovule primordium. So, option 'd' is incorrect.
Conclusion:
Among the given options, the correct answer is option 'B' which states that the n, 2n, and 3n conditions occur respectively in the egg, nucellus, and endosperm.
In a fertilized ovule, different ploidy conditions occur in different parts of the ovule. The correct answer is option 'B' which states that the n, 2n, and 3n conditions occur respectively in the egg, nucellus, and endosperm.
Explanation of the options:
a) Antipodal, egg, and endosperm: The antipodal cells are formed during the development of the embryo sac and they are haploid (n) in nature. The egg cell is also haploid (n) as it is derived from the haploid megaspore. The endosperm, on the other hand, is triploid (3n) as it is formed by the fusion of the sperm cell (n) with the two polar nuclei (2n). So, option 'a' is incorrect.
b) Egg, nucellus, and endosperm: The egg cell is haploid (n) as mentioned earlier. The nucellus is a part of the ovule that surrounds the embryo sac and it is haploid (n) in nature. The endosperm is triploid (3n) as it is formed by the fusion of the sperm cell (n) with the two polar nuclei (2n). So, option 'b' is correct.
c) Endosperm, nucellus, and egg: The endosperm is triploid (3n) as mentioned earlier. The nucellus is haploid (n) in nature. The egg cell is also haploid (n) as it is derived from the haploid megaspore. So, option 'c' is incorrect.
d) Antipodals, synergids, and integuments: The antipodal cells are haploid (n) as mentioned earlier. The synergids are also haploid (n) in nature. The integuments are diploid (2n) as they are derived from the diploid ovule primordium. So, option 'd' is incorrect.
Conclusion:
Among the given options, the correct answer is option 'B' which states that the n, 2n, and 3n conditions occur respectively in the egg, nucellus, and endosperm.
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In a fertilised ovule, n, 2n and 3n conditions occur respectively ina)Antipodal, egg and endosperm.b)Egg, nucellus and endosperm.c)Endosperm, nucellus and egg.d)Antipodals, synergids and integuments.Correct answer is option 'B'. Can you explain this answer?
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