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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.
$(a)$ $C-$peptide is not present in mature insulin.
$(b)$ The insulin produced by $rDNA$ technology has $C-$peptide.
$(c)$ The pro-insulin has $C-$peptide.
$(d)$ $A-$peptide and $B-$peptide of insulin are interconnected by disulphide bridges.
Choose the correct answer from the options given below.