Which of the following nerves arises from organ of Corti?
Olfactory nerve
Cochlear nerve
Abducens nerve
None of these
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.
Which of the following is the characteristic of PS-I?
It is active only upto 680 nm of light.
The reaction centre of PS- I is P680.
PS- I is reduced by the electrons released in photolysis of water.
PS-I is involved in non-cyclic photophosphorylation.
Which one feature is common to leech, cockroach and scorpion?
Nephridia
Ventral nerve cord
Cephalization
Antennae
What is diapedesis?
A kind of amoeboid movement.
The process of filtration of urea in kidney.
A type of locomotion found in Hydra
Migration of WBCs into the tissue spaces from blood capillaries
Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?
Morphine
Valium
Amphetamines
Hashish
Duodenum has characteristic Brunner's gland which secretes two hormones called
prolactin, parathormone
secretin, cholecystokinin
enterocrinin, duocrinin
gastrin, enterogastrone
The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and small bronchi are known as
squamous epithelium
columnar epithelium
ciliated epithelium
cuboidal epithelium
