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During double fertilization in a flowering plant, one sperm fuses with the egg (syngamy) and the other sperm fuses with the secondary nucleus (triple fusion) to form the:
AThe diploid zygote cell
BA degenerating synergid
CPrimary endosperm nucleus
DA degenerating antipodal
Answer & Solution
Correct answer: C. Primary endosperm nucleus
1. In double fertilization two sperms enter the embryo sac.
2. One sperm fuses with the egg (syngamy) to form the diploid zygote.
3. The other sperm fuses with the secondary (two polar) nucleus in triple fusion to form the primary endosperm nucleus, which is triploid.
4. The diploid zygote is the syngamy product, not the triple fusion product, so it is ruled out.
5. Synergids and antipodal cells later degenerate and are not formed by fusion, so they are wrong.
6. So the triple-fusion product is the triploid primary endosperm nucleus.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 17 Reproduction in Plants and Animals "Fertilization in Plants", p.255_
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