MCQ
Intensely lactating mothers do not generally conceive due to the
- AHyper secretion of gonadotropins.
- ✓Suppression of gonadotropins.
- CSuppression of gametic transport.
- DSuppression of fertilisation.
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$A.$ Denaturation
$B.$ Annealing
$C.$ Extension
$I$. 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.