Which one of the following is correct regarding the excretion?

1. Large amount of water from renal filtrate is reabsorbed in DCT and a less amount is reabsorbed by PCT.

2. The descending limb of loop of Henle is almost impermeable to salts.

3. Malpighian corpuscle is found in medulla region of kidney

4. The colour of urine is pale yellow and is slightly alkaline in nature.

Which of the following process of urine formation takes place all along the renal tubule and collecting duct?

1. Ultrafiltration and tubular reabsorption

2. Ultrafiltration and tubular secretion

3. Tubular reabsorption and secretion

4. Anti-current mechanism and reabsorption

The production of urea and uric acid is because of

1. Conservation of water

2. Terrestrial adaptation

3. Terrestrial adaptation for conservation of water

4. Advancement of organism in comparison to all water animals

Kidney matrix retains some amount of urea to

1.Maintain a desired osmolarity

2.Maintain metabolism

3.Maintain balance of the body

4.Maintain micturition

Which of the following has not the protonephridia as an excretory organ?

1. Rotifers

2. Amphioxus

3. Planaria

4. Earthworm

Which of the following is not the primary function of protonephridia?

1. Ionic volume regulation

2. Fluid volume regulation

3. Osmoregulation

4. Excretion

If one goes from the outer side to the inside, which of the following parts comes first?

1. Hilum

2. Calyces

3. Pelvis

4. Cortex

Our excretory system has

1.Two million nephrons

2.One million nephrons

3.Two million neurons

4.One million neurons

The principal nitrogenous excretory compound in humans is synthesised.

1. in kidneys but eliminated mostly through liver

2. in kidneys as well as eliminated by kidneys

3. in liver and also eliminated by the same through bile

4. in the liver, but eliminated mostly through kidneys

Which one of the following statements in regard to excretion by the human kidneys is correct?