21.

The yellow colour of urine is due to the presence of

• urea

• uric acid

• urochrome

• bilirubin

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 nerve is purely motor nerve?

• vagus

• facial

• abducens

• trigeminal

Which of the following part of a neuron is covered by fatty sheath ?

• axon

• cyton

• dendrite

• node of Ranvier

A fruit developed from a condensed inflorescence is :

• simple fruit

• aggregate fruit

• composite fruit

• etaerio

The stage of cell cycle when cell has undergone differentiation is :

• G₀

• G₁

• G₃

• G₄

Principle protein of cillia and flagella is :

• globulin

• fibrin

• flagellin

• tubulin

Photosynthetic bacteria have :

• pigment system I (only one pigment system)

• pigment system II

• both (a) and (b)

• some other type

DNA/chromosome replication takes place during:

• G₁- phase

• G₂- phase

• S- phase

• Prophase

Active transport occurs :

• against concentration gradient and requires ATP

• against concentration gradient and does not require ATP

• along concentration gradient but require ATP

• along concentration gradient but does not require ATP