The world's most problematic aquatic weed is

In an ecosystem,the insectivorous plants are placed in

In a typical terrestrial ecosystem,which of the following statements regarding population size is correct?

$A$: Niche becomes general and broader during biotic succession.
$R$: Species diversity increases but organic matter is decreased.

$A$ food chain consists of:

What will happen to an ecosystem if:
$(a)$ All producers are removed;
$(b)$ All organisms of herbivore level are eliminated; and
$(c)$ All top carnivore population is removed?