Epicotyl, Cotyledon, Hypocotyl, Endosperm, Seed coat?

[Smooth Operater]

Is there any expert plant biologist out there?

can you define the structures and functions of:
-Epicotyl
-Cotyledon
-Hypocotyl
-Endosperm
-Seed coat

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[joonkimdds]

Is there any expert plant biologist out there?

can you define the structures and functions of:
-Epicotyl
-Cotyledon
-Hypocotyl
-Endosperm
-Seed coat

i can answer all but let me write what i can think of right now
Cotyledon is...
U can divide Angiosperms into monocot and dicot.
The way u distinguish them is that monocot has 1 cotyledon and dicot has 2.
Cotyledon also stores food for....something that i can't remember now

Endosperm is 3n. do u know that 1n and 2n are called haploid and diploid repectively? anyway endosperm is 3n.
when pollen grain enters ovule, it divides into 2 sperm (therefore 1n and 1n).
Ovule divides into egg👎 and 2polar nuclei(2n).
1n enters egg👎 and become 2n.
another 1n enters 2polar nuclei(2n) and becomes 3n(since 1+2 = 3).
we call this 3n endosperm.
some books call 2polar nuclei in different names that i can't remember now.

 

[aranjuez]

Epicotyl is the "top" portion; becomes the shoot tip.

Cotyledon are the seed leaves. I don't care what Kaplan's course says. I have yet to hear that they provide some sort of source of food. They're produced by USING the "food" stored in the endosperm.

Hypocotyl is the "lower" portion, and becomes the shoot tips. This is lower down in the plant.

Just to clarify for the endosperm formation... there are two kinds of sperm nuclei: tube and generative. The generative splits into 2, one going for the egg and the other going for the 2 polar bodies, which makes the endosperm. Remember... generative.

aranjuez