In an angiospermic plant just after double fertilization , arrangement of nuclei in an ovule

Options

A. Five haploid , One diploid , One triploid
B. Three haploid , Two diploid , Two triploid
C. Two haploid , Three diploid , Two triploid
D. One haploid , Three diploid , Three triploid

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Ovule:**
- The ovule contains an embryo sac, which is made up of several types of cells: synergids, egg cell, antipodal cells, and polar nuclei.

2. **Identifying the Cells in the Embryo Sac:**
- The embryo sac has:
- 2 synergids (haploid)
- 1 egg cell (haploid)
- 3 antipodal cells (haploid)
- 2 polar nuclei (which are not yet fused)

3. **Process of Double Fertilization:**
- In angiosperms, double fertilization occurs when:
- One male gamete fuses with the egg cell to form the diploid zygote (embryo).
- The other male gamete fuses with the two polar nuclei to form a triploid cell (primary endosperm).

4. **Resulting Nuclei Arrangement After Fertilization:**
- After double fertilization, the arrangement of nuclei in the ovule will be:
- 1 diploid nucleus (from the zygote/embryo)
- 1 triploid nucleus (from the primary endosperm)
- 5 haploid nuclei (2 from synergids, 1 from the egg, and 3 from antipodal cells)

5. **Final Count of Nuclei:**
- Therefore, the final arrangement of nuclei in the ovule after double fertilization is:
- 5 haploid nuclei
- 1 diploid nucleus
- 1 triploid nucleus

**Conclusion:**
The arrangement of nuclei in an ovule just after double fertilization in an angiospermic plant is: 5 haploid cells, 1 diploid cell, and 1 triploid cell.

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