Assertion (A):	Camel can go without water for long periods.
Reason (R):	Camels stores water in the pouches of their rumen and fat in their hump.

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False and (R) is False.

Assertion   :       Renal threshold of glucose is said to be 180 mg per 100 ml.

Reason      :       Glucose starts appearing in the urine when its blood level exceed 180 mg per 100 ml of blood.

Assertion   :       Earthworms excrete both ammonia and urea.

Reason      :       Excretion in earthworm depends on the environment.

Assertion   :       If human urine is allowed to stand for some time, it smells strongly of ammonia.

Reason      :       Main constituent of human urine is Ammonia.

Assertion   :       Birds can considerably reduce water loss in the urine.

Reason      :       Birds store urine along with faeces in the cloaca.

Assertion   :       The glomerular filtrate resembles the protein free plasma in composition and osmotic pressure.

Reason      :       The glomerular capillary wall and inner membrance of Bowman’s capsule are impermeable to large molecules.

Assertion             :       Kidneys maintain the osmotic concentration of the blood.

Reason      :       Kidneys eliminate either hypotonic or hypertonic urine according to the need of the body.

Assertion    :       During micturition, urine is prevented from flowing back into the ureters.

Reason      :       Urethral sphincters relax during micturition.

Assertion   :       Secreting hypotonic urine is effective in reducing urinary loss of water.

Reason      :       Hypotonic urine is more concentrated and higher in osmotic pressure than the blood.

Assertion   :       In birds and reptiles, main excretory product is the combined form of urine and faeces.

Reason      :       Birds and reptiles have no separate chamber for excretion of urine and faeces.