State two functions of placenta.

Define dialysis.

Name two types of passive transport.

The diagram below represents an experiment to demonstrate a particular aspect of a physiological process in plants. Study the diagram and answer the questions that follows.

(a) What is the aim of the experiment?

(b) What is the chemical substance named X in the diagram? What will be the effect of treatment with the solution of substance X?

(c) Out of the parts mentioned A and B, which will show blue-black colour in the presence of X. Why?