MCQ
In Escherichia coli lac Operon is induced by:
- ALactose.
- BPromoter gene.
- Cβ-galactosidase.
- DI-gene.
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$I$. Each cell of sporogenous tissue in anther is capable of giving rise to microspore tetrad.
$II$. The pollen grain represent male gametophyte.
$III$. Pollen grains are usually triangular and $10-15 \mu m$ in diameter.
$IV$. Sporopollenin is one of the most resistance organic material which can be destroyed only by strong acids
and alkali.
| Column $- I$ | Column $- II$ |
| $(p)$ Intine | $(v)$ Long structure |
| $(q)$ Exine | $(w)$ Nutrition to pollengrain |
| $(r)$ Pollentube | $(x)$ Sporopollenin |
| $(s)$ Tapetum | $(y)$ Pectin, cellulose |
| $(z)$ Glycogen |