The plants $Prosopis$ (Khejri),$Acacia$ (Babul),and $Capparis$ (Kair) are representative of which tropical biome?

How many of the following statements are correct about niche?
$i$. It denotes the functional role played by an organism.
$ii$. It deals with the flow of energy from one organism to another.
$iii$. As soon as a niche is left vacant,other organisms fill that position.
$iv$. The same niche is shared by two or more species.
$v$. Organisms living in the same habitat differ in their niches.

$A$: Aquatic organisms do not experience mechanical shocks while swimming in water.
$R$: Water is a liquid medium for swimming.

Which of the following organisms do not enter a state of dormancy to escape environmental stress?

The upper part of sea water mainly contains

Lianas occur more commonly in