MCQ
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
- A$-160^oC$
- B$-120^oC$
- ✓$-196^oC$
- D$-80^oC$
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Lower in presence of another superior species
$I$. 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.