What are 'true breeding lines' that are used to study inheritance pattern of traits in plants?

Name any two types of cells that act as 'cellular barriers' to provide innate immunity in humans.

Give an example of an organism that enters 'diapause' and why.

How is 'stratification' represented in a forest ecosystem?

How does the gene 'I' control ABO blood groups in humans? Write the effect the gene has on the structure of red blood cells.

State the cause of accelerated eutrophication.

Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

Mention the type of host cells suitable for the gene guns to introduce an alien DNA.

Identify 'a' and 'b' in the figure given below representing proportionate number of major vertebrate taxa.

Write the name of the organism that is referred to as the 'Terror of Bengal'.