NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Which one of the following is a sesamoid bone?

  • Pelvis

  • Patella

  • Pterygoid

  • Pectoral girdle



Patella is a sesamoid bone. Sesamoid bones are small rounded masses of bones formed in tendons at the joints where they are subjected to great pressure.


Which of the following nerves arises from organ of Corti?

  • Olfactory nerve

  • Cochlear nerve

  • Abducens nerve

  • None of these


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.


PS-I is involved in non-cyclic photophosphorylation.

Photosystem- I is found in the non appressed part of grana thylakoids as well as stroma thylakoids. Chlorophyll : carotenoid content is high. Its photocenter is P700. This photosystem receives electrons from Photosystem II. It is involved in both cyclic and non- cyclic photophosphorylation.


Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?

  • Morphine

  • Valium

  • Amphetamines

  • Hashish



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.


Duodenum has characteristic Brunner's gland which secretes two hormones called

  • prolactin, parathormone

  • secretin, cholecystokinin

  • enterocrinin, duocrinin

  • gastrin, enterogastrone


secretin, cholecystokinin

Secretin and cholecystokinin are secreted by Brunner's gland located in duodenum. Secretin causes the pancreas to secrete alkaline pancreatic juice and stimulates bile production in the liver. Cholecystokinin induces the gall bladder to contract and eject bile into the intestine and stimulates the pancreas to secrete its digestive enzymes.


Respiration is controlled by

  • medulla oblongata

  • cerebellum

  • hypothalamus

  • cerebrum


medulla oblongata

Medulla oblongata is the primary respiratory control center. Its main function is to send signals to the muscles that control respiration to cause breathing to occur.


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


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.


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


ciliated epithelium

Ciliated epithelium is a region of epithelium consisting of columnar or cuboidal cells bearing hairlike appendages that are capable of beating rapidly. It performs the functions of moving particles of fluids over the epithelial surface.

Cuboidal epithelium is found in ducts of glands and tubular parts of nephrons in kidney.

Columnar ciliated epithelium occurs in fallopian tubules, nasal passages, bronchioles, small bronchi and buccopharyngeal cavity of frog.


Which one feature is common to leech, cockroach and scorpion?

  • Nephridia

  • Ventral nerve cord

  • Cephalization

  • Antennae


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.


Intermediate host is absent in the infection of

  • Plamosdium

  • Trypanosoma

  • Entamoeba

  • Filarial worm



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.