Define the term ultrafiltration.

Name the mineral elements required for:

(a) Clotting of blood

(b) Synthesis of thyroxine

Why are RBCs efficient in their functions though they lack nucleus and mitochondria?

The diagram given below represents a stage in mitosis.

(a) Identify the stage given above.

(b) Give one reason to support your answer in (a).

(c) Mention the number of chromosomes given in the diagram.