Which is incorrect statement?

$I$. 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.

• A

  $I$, $II$ are incorrect but $III$, $IV$ are correct

• B

  $III$, $IV$ are incorrect but $I$, $II$ are correct

• C

  $I$, $III$ are incorrect but $II$, $IV$ are correct

• D

  $II$, $IV$ are correct but $I$, $III$ are incorrect