STD 12 - 2. human reproduction — BIOLOGY STD 12 Science — Question

$I.$ sample $DNA$ is cut into fragments

$II.$ restriction endonucleases

$III.$ agarose gel

$IV.$ ethidium bromide

$V.$ UV-radiation

$VI.$ elution

Mark the correct sequence of their use

$I$. 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.