List of practice Questions

Forest of nephridia present in

Excretion in cockroach takes place by

Ethers are quite stable towards :

Enzymes with two sites are called

Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will:

Common feature in earthworm & cockroach is

Circinate vernation is present in

$CH _{3} COCH _{3}$ can be converted to $CH _{3} CH _{2} CH _{3}$ by the action of

Iron porphyrin occurs in :

Barr body are associated with

Azimuthal quantum number defines

At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^\circ$C ?

At the uppermost point of a projectile, its velocity and acceleration are at an angle of

Woolen clothes keep the body warm in winter. Air is a bad conductor of heat.

The two cotyledons in the seed are often referred to as the embryonic leaves. The embryo contains radicle and plumule.

The megaspore mother cell undergoes mitosis to produce four megaspores. Megaspore mother cells and the megaspores are both haploid.

The collenchyma is a thick walled living tissue. The collenchyma is thickened due to the deposition of pectin.

Systematics is the branch of biology that deals with classification of living organism. The aim of classification is to group the organisms in an orderly manner.

Stress is the internal force per unit area of a body. Rubber is more elastic than steel.

S.I. units are logical and coherent. S.I. system of units is a rationalised system.

Potassium and caesium are used in photoelectric cells. Potassium and caesium emit electrons on exposure to light.

Physical absorption of molecules takes place on surface only In this process, the bonds of the absorbed molecules are broken.

Phenol is a weaker acid than ethanol. Groups with $+M$ effect and $-I$ effect decrease acidity at $m$-position.

Lateral line system is found in fishes and aquatic larval amphibians. Lateral line system has receptors which are the clusters of sensory cells derived from ectoderm.

In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of oscillation of the balls (i.e. when they are in contact). Energy spent against friction does not follow the law of conservation of energy.