In embryo sac, n 2n, 3n conditions are found respectively in :-[Jharkhand 2006]a)Egg, antipodal, endospemb)Nucellus, endosperm, eggc)Antipodal, zygote, endospermd)Endosperm, nucellus, eggCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Antipodals r the haploid tissues in the embryosac...

Zygote = structure formed after fusion of male n female gamet....
So it is diplod

Endosperm = structure formed after fusion of male gamet(n) with the polar nuclei (2n)
So it is triplod...

Answer

Antipodals are formed after meiosis followed by mitosis of the Megaspore mother cell (2n) and are thus haploid (n). The main plant body is the sporophyte and is thus diploid (2n). Hence the zygote and the nucellus are also 2n. Obviously the egg is haploid (n). The endosperm is formed on the fusion of the two polar nulcei (each is n) and one of the male gametes(also n). Consequently the endosperm is triploid (3n).

Answer

Yr answer is right but ...

Answer

Embryo Sac Conditions
The embryo sac is a structure found in the ovule of a flowering plant. It contains the female gametes and plays a crucial role in fertilization and seed development. The conditions of the embryo sac can vary and are denoted by the number of sets of chromosomes present in the cells. Let's examine the conditions mentioned in the options:
A: Egg, Antipodal, Endosperm
- Egg: The egg cell in the embryo sac is the female gamete that fuses with the male gamete (sperm) during fertilization.
- Antipodal: Antipodal cells are present at the opposite end of the embryo sac and have a role in nourishing the developing embryo.
- Endosperm: The endosperm is a nutritive tissue that provides nourishment to the developing embryo. It is triploid (3n) in most flowering plants.
B: Nucellus, Endosperm, Egg
- Nucellus: The nucellus is the central part of the ovule that surrounds the embryo sac. It provides nourishment to the developing embryo.
- Endosperm: As mentioned earlier, the endosperm is a nutritive tissue that nourishes the developing embryo. It is triploid (3n).
- Egg: The egg cell is the female gamete present in the embryo sac.
C: Antipodal, Zygote, Endosperm
- Antipodal: Antipodal cells, as mentioned earlier, are present at the opposite end of the embryo sac.
- Zygote: The zygote is formed when the egg cell fuses with the sperm cell during fertilization. It is diploid (2n).
- Endosperm: The endosperm, again as mentioned earlier, is a nutritive tissue that nourishes the developing embryo. It is triploid (3n).
D: Endosperm, Nucellus, Egg
- Endosperm: The endosperm, as mentioned earlier, is a nutritive tissue that nourishes the developing embryo. It is triploid (3n).
- Nucellus: The nucellus is the central part of the ovule that surrounds the embryo sac. It provides nourishment to the developing embryo.
- Egg: The egg cell is the female gamete present in the embryo sac.
Conclusion:
Based on the given options and the conditions mentioned, it is clear that option C is the correct answer. In the embryo sac, the conditions of antipodal, zygote, and endosperm are found.

Answer

Embryo Sac in Plants

The embryo sac, also known as the female gametophyte, is a structure within the ovule of a flowering plant where the female gametes are produced. It is a crucial part of the plant's reproductive process as it contains the egg cell, which is fertilized by the male gamete to form the zygote.

Different Conditions in Embryo Sac

In the given question, we are asked to identify the conditions of n, 2n, and 3n in the embryo sac. Let's understand what these conditions mean in the context of the embryo sac:

1. n Condition: The n condition refers to the haploid state, where the number of chromosomes is reduced by half. In plants, the haploid condition is usually found in the gametes (sex cells) and certain structures of the gametophyte generation.

2. 2n Condition: The 2n condition refers to the diploid state, where the number of chromosomes is doubled. This condition is commonly found in the somatic cells of plants, including the cells of the sporophyte generation.

3. 3n Condition: The 3n condition refers to the triploid state, where the number of chromosomes is three times the haploid number. Triploid cells are usually formed by the fusion of a haploid and a diploid cell.

Conditions in the Embryo Sac

Based on the given options, it is stated that the 2n, 3n, and n conditions are found respectively in antipodal, zygote, and endosperm.

1. Antipodal Cells: The antipodal cells are part of the embryo sac and are formed at the opposite end of the sac. These cells are generally haploid (n), representing the n condition.

2. Zygote: The zygote is formed by the fusion of the male gamete (sperm) with the female gamete (egg cell) during fertilization. The zygote is diploid (2n), representing the 2n condition.

3. Endosperm: The endosperm is a nutritive tissue that develops alongside the embryo in the seed. It provides nourishment for the growing embryo. The endosperm is usually triploid (3n), representing the 3n condition.

Conclusion

In conclusion, the conditions of n, 2n, and 3n are found respectively in the antipodal cells, zygote, and endosperm of the embryo sac. Understanding these conditions is important in comprehending the reproductive processes of flowering plants.

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