MCQ
Who proved first time that $DNA$ is a genetic material
- AJacob and Monad
- BAvery, Mcleod and McCarthy
- ✓Griffith
- DHarshey and Chase
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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.