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Read Double Fertilisation and Endosperm
Angiosperms use two sperm cells: one forms the embryo and one contributes to endosperm.
NSEJS · Reproduction in Organisms & Sexual Reproduction in Flowering Plants · 3 linked questions · 100% coverage
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Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Structure · The part being namedFunction · What that part doesCondition · The situation that changes the answer
Study deeper: NCERT Science · Reproduction in Organisms & Sexual Reproduction in Flowering Plants
Count ploidy
If a synergid
n = 8, the egg is also n=8;
embryo is 2
endosperm is 3
pollen mother cell is 2
Endosperm generally develops before the embryo and tender-coconut water is free-nuclear endosperm.
Trace pollen-tube entry
Pollen tubes may enter through the micropyle (porogamy), chalaza (chalazogamy) or integuments (mesogamy).
OlympIQ exam lens
- ✓Syngamy: n+n → 2n embryo.
- ✓Triple fusion: n+2n → 3n endosperm.
- ✓Endosperm commonly develops before embryo.
- ✓Porogamy, chalazogamy, mesogamy are entry routes.
OlympIQ trap
Do not assign the same ploidy to embryo and endosperm.
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