D.

Migration of WBCs into the tissue spaces from blood capillaries

WBCs can change their shape like amoeba and are thus, capable of amoeboid movement. This enables them to squeeze out of blood capillaries into the tissues. This process is called diapedesis.

B.

Valium

Valium is a benzodiazephine (sedative) that gives a feeling of relaxation, calmness or drowsiness in the body.

Morphine is the main opium alkaloid that depresses respiratory centre and contributes to the fall in blood pressure.

Amphetamines are synthetic drugs and are stimulant in nature.

Hashish is a hallucinogen.

B.

Cochlear nerve

The organ of Corti consists of outer hair cells, inner hair cells, inner pillar cells, outer pillar cells, tunnel of Corti, phalangeal cells (cells of Deiters), cells of Hensen and cells of Claudius. The sensory hair project from the outer ends of the hair cells into the scala media, while from the inner end of the cells nerve fibres arise, which unite to form the cochlear nerve.

C.

Entamoeba

Entamoeba histolytica is a monogenetic parasite, i.e., living in a single host, in the large intestine of humans. It causes amoebiasis or amoebic dysentery.

B.

Ventral nerve cord

The ventral nerve cord is a cord of nervous tissue that runs the length of the animal in the lower part of its body. It is the charcateristic of lower chordates like leech, cockroach and scorpion.