Population density of terrestrial organisms is measured in terms of individuals per
$m^{3}$
$m^{4}$
$m$
$m^{2}$
The organism which are present in tropical regions called
What is a tree line ?
Salinity of the soil is often caused due to
One of the effects of dust is to cause
Assertion : Thick cuticle is mostly present in disease resistant plants.
Reason : Disease causing agents cannot grow on cuticle and cannot invade the cuticle.