Calciferol is

$A$ deficiency of which of the following causes continuous bleeding from an injured part of the body?

Match List-$I$ with List-$II$:

$A$. Trypsin	$I$. Intercellular ground substance
$B$. Morphine	$II$. Lectin
$C$. Concanavalin	$III$. Enzyme
$D$. Collagen	$IV$. Alkaloid

Choose the correct answer from the options given below:

Water is important for an animal's body in .........

Given below are two statements:
Statement $I$: Low temperature preserves the enzyme in a temporarily inactive state,whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement $II$: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme,it is known as a competitive inhibitor.
In the light of the above statements,choose the correct answer from the options given below:

The nitrogen content of urea is: (in $\%$)