Explain the terms "tenuinucellate" and "crassinucellate" ?
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In tenuinucellate ovules, most of the nucellus degenerates before the embryo sac reaches maturity whereas in case of crassinucellate ovules, the nucellus expands by cell division during embryo sac development, and the mature embryo sac is covered by enlarged nucellus.
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In botany, tenuinucellate is term used to refer the ovule in which there is no or only one layer of cells is present between the megasporophyte and epidermal cells during the early development of megasporophyte.
In contrast, crassinucellate refers to the ovule in which two or more layers of the cells is present between megasporophyte and epidermal cells during megasporophyte development.
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