Assertion $A$: Aquatic organisms do not experience mechanical shocks while swimming in water.
Reason $R$: Water is a liquid medium for swimming.
Which option is correct for Assertion $A$ and Reason $R$?

Give one example for each of the following:
$(i)$ Eurythermal plant species: $................$.
$(ii)$ $A$ hot water spring organism: $................$.
$(iii)$ An organism seen in deep ocean trenches: $................$.
$(iv)$ An organism seen in a compost pit: $................$.
$(v)$ $A$ parasitic angiosperm: $................$.
$(vi)$ $A$ stenothermal plant species: $................$.
$(vii)$ Soil organism: $................$.
$(viii)$ $A$ benthic animal: $................$.
$(ix)$ Antifreeze compound seen in Antarctic fish: $................$.
$(x)$ An organism which can conform: $................$.

Smaller animals tend to lose body heat very fast as compared to larger animals because they have

What is adaptation? Explain with examples how various organisms show adaptations to cope with specific environmental conditions.

Which of the following are the dominant plants of the cold desert?

The ecologically fixed and genetically irreversible species are called