C.

Both (a) and (b)

Respiration in Ascaris is both anaerobic and aerobic. It occurs in different conditions.

In the process of anaerobic respiration, glycogen undergoes glycolysis to yield carbon dioxide, fatty acids and energy. The main fatty acids which are produced include valerianic butyric and caproic acids. These are excreted through cuticle and these impart a characteristic smell like that of a canned pineapple.

D.

absent

Hemolymph is colourless because there are no blood cells or respiratory pigment. The cockroaches lack respiratory pigment.

Hemocyanin is a protein which carries the oxygen in the arthropods.

Haemozoin is a disposal product formed from the digestion of blood by some blood- feeding parasites.

Haemoglobin is a red protein responsible for transporting oxygen in the blood of vertebrates.

B.

secretory organ

Golgi bodies are secretory organ of the cell. In golgi apparatus, protein glycosylation takes place. 

B.

around the contractile vacuole

In Amoeba lobose type of pseudopodia with hyaline caps are present.

A.

Bone

Bones are covered with calcium phosphate, which provide strength and hardness to them.