NEET Biology Solved Question Paper 2007

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

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.

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 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.

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.

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-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.

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

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.

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