Which biome is characterized by moderate rainfall during summer?

In an ecological food chain,humans are ..........

Match the ecological terms given in Column $I$ with its correct explanation in Column $II$.

Column $I$ (Terms)	Column $II$ (Explanation)
$1$. Stratification	$a$. Horizontal distribution of different species
$2$. Zonation	$b$. Rate of generation of Biomass in an ecosystem
$3$. Productivity	$c$. Breakdown of detritus
$4$. Decomposition	$d$. Vertical distribution of different species

Choose the correct option.

Study the diagram carefully and fill in the blanks. Choose the correct option for $A, B, C, D$ and $E$.

Choose the correct sequence of transitional communities in Xerarch succession.

Sometimes,due to biotic or abiotic factors,the climax community remains in a particular seral stage (pre-climax) without reaching the final climax. Do you agree with this statement? If yes,provide a suitable example.