MCQ
Volcano eruption disturbs:
- ✓Phosphorus cycle
- BNitrogen cycle
- CCarbon cycle
- DSulphur cycle
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| Column $- I$ | Column $- II$ |
| $(a)$ Vertebrates | $(p)\; 359$ |
| $(b)$ Plants | $(q)\; 784$ |
| $(c)$ Indian invertebrate | $(r)\; 87$ |
| $(s)\; 338$ |
$I$. 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.