Explain the terms tenuinucellate and crassinucellate?

Answer:

There are two types of ovule based on the position of the sporogenous cell.

Tenuinucellate type

If the sporogenous cell is hypodermal with a single layer of nucellar tissue around it is called tenuinucellate type. Normally tenuinucellate ovules have very small nucellus.

crassinucellate type

Ovules with subhypodermal sporogenous cell is called crassinucellate type.

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