The mass of living material at a trophic level at a particular time is called :

Multiple alleles are present :

Vertical distribution of different species occupying
different levels in a biotic community is known as:

In a ring girdled plant:

The chromosomes in which centromere is situated
close to one end are:

The structures that are formed by stacking of
organized flattened membranous sacs in the
chloroplasts are :