The excretory material of bony fish is

• urea

• protein

• ammonia

• amino acid

The leucocytes contain which of the following in large quantity?

• Basophils

• Neutrophils

• Eosinophils

• Monocytes

During inspiration, the diaphragm

• expands

• shows no change

• contracts and flattens

• relaxes to become dome- shaped

The vacuole is lined by a membrane called

• tonoplast

• jacket

• cell membrane

• tonoplasm

The function of pineal body is to

• lighten the skin colours

• control sexual behaviour

• regulates the period of puberty

• All of the above

Which of the following is important for muscle contraction and nerve impulse transmission?

• Ca²⁺ ions

• Mg²⁺ ions

• Both (a) and (b)

• Fe²⁺ ions

Indusium is found in

• algae

• ferns

• moss

• Cycas

Contractile vacuole in protozoan Amoeba is meant for

• respiration

• excretion

• locomotion

• osmoregulation

Kupffer cells are present in

• liver

• small intestine

• pancreas

• thyroid gland

Which one is component of Ornithine cycle?

• Ornithine, citrulline and alanine

• Ornithine, citrulline and arginine

• Amino acid are not used

• Ornithine, citrulline and fumaric acid