Who is known as the $ \text{Father of Embryology} $?

The theory of use and disuse was proposed by:

Obtaining silk from silkworms is called

Match the branches of Biology listed in column $I$ with the areas of study listed in column $II$. Choose the answer which gives the correct combination of alphabets of the two columns.

Column $I$ (Branches of Biology)	Column $II$ (Area of Study)
$A$. Helminthology	$p$. Study of insects
$B$. Entomology	$q$. Study of fungi
$C$. Ornithology	$r$. Study of algae
$D$. Phycology	$s$. Study of birds
	$t$. Study of worms

$DNA$ replication of semiconservative type was first demonstrated by

Non-poisonous leeches were used for preventing the clotting of blood in post-operative cases during $600$ $BC$ by