NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


ADH controls water permeability of

  • collecting tube

  • distal convoluted tubule

  • proximal convoluted tubule

  • bowman's capsule


distal convoluted tubule

ADH or vasopressin is effective in reabsorption of water by changing permeability of DCT (distal collecting tubules) or collecting ducts.


Flying fish is

  • Torpedo

  • Scoliodon

  • Anguilla

  • Exocoetus



Flying fish (Exocoetus) is a carnivorous fish. It is known as flying fish because it can leap into air by powerful tail and remain in air due to gliding slowly by means of large pectoral fins.


Which one is uricotelic ?

  • Frog and toads

  • Lizards and birds/cockroach

  • Cattle, monkey and man

  • Molluscs and teleost fishes


Lizards and birds/cockroach

Uricotelic organisms are the organism that excrete nitrogen mostly in the form of uric acid. Animals that live in dry (arid) conditions are uricotelic. Uric acid is the main excretory nitrogenous product, discharge in solid form in uricotelic animals. Eg, Cartilaginous fishe, bony fish, amphibians and mammals.


Apis dorsata refers to

  • rock bee

  • little bee

  • Indian bee

  • European bee


rock bee

Apis dorsata is the scientific name of rock bee. It is found in the region of South and Southeast Asia. It is around 17- 20 mm long. Nests are mainly built in exposed places such as on tree limbs, buildings etc.


Salamandra atra is

  • ovoviviparous

  • oviparous

  • sexuaily sterile

  • parthenogenetic



The Salamandra atra is ovoviviparous. The male discharge sperms in a capsule known as spermatophore. It is picked up by a female to fertilize her eggs internally. The female give birth to larvae and develops completely in water.


During the conduction of nerve impulse, the action potential is the result of movement of

  • Na+ from intracellular fluid to extracellular fluid

  • Na+ from extracellular fluid to intracellular fluid

  • Na+ towards both directions

  • None of the above


Na+ from extracellular fluid to intracellular fluid

Nerve impulse is a wave of bioelectric disturbance that passes along a nerve during conduction of an excitation. The electrochemical potential developed during depolarisation is called action potential during which Na+ from extracellular fluid move the intracellular fluid.


Vitamin essential for proper functioning of liver and clotting of blood is

  • Vitamin- K

  • Vitamin- A

  • Vitamin- E

  • Vitamin- B12


Vitamin- K

Vitamin-K is essential for proper functioning of liver and clotting of blood, while vitamin- A is essential for eyes, vitamin- C for skin and vitamin- B12 for haemoglobin.


Which of the following is not a character of Chordata?

  • Dorsal tubular nerve cord

  • Pharyngeal gill slits

  • Presence of notochord

  • Presence of spinal cord


Presence of spinal cord

Presence of spinal cord is not a characteristic feature of all chordates.


The sliding filament theory of muscle contraction was proposed by

  • A.F. Huxley and A.P. Pullman

  • A.F. Huxley and H.E. Huxley

  • B. Pullman and A.F. Huxley

  • A. Pullman and E. Pullman


A.F. Huxley and H.E. Huxley

A.F. Huxley and H.E. Huxley elucidated the mechanism of contraction and relaxation of straited muscle fibres. They proposed that the shortening of fibrils in contraction is brought about by sliding movement of actin filaments over myosin filaments.


Which are the longest cells in the body of man ?

  • Muscle cells of legs

  • Bone cells

  • Nerve cells

  • None of the above


Nerve cells

The longest cell in human body is neurons or nerve cells. They are located in the base of spinal cord.