Assertion (A): Kidneys eliminate urea and water only during excretion.

Reason (R): Urea is the most poisonous, nitrogenous waste of the body, so it must be excreted out as early as possible.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Renal artery carries deoxygenated blood full of nitrogenous wastes.

Reason (R): Most of the arteries carry oxygenated blood, but there are exceptions.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Haematuria is the condition in which the blood passes with urine due to some infection in the urinary tract, kidney stones or tumour.

Reason (R): An excessive number of RBCs and haemoglobin is produced in the bone marrow. So these are excreted out through the urine.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Effectors are the part of our body which, on receiving stimulus, set up waves of impulses towards the central nervous system.

Reason (R): The specialized epithelial cells of certain organs are capable of receiving stimuli which can be light, sound, heat, pain, hunger, etc.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.