Which of the following statements are correct?
(i) Renal vein takes blood away from kidney.
(ii) Urine gets dilute in ascending limb of loop of Henle.
(iii) Podocytes occur in inner wall of Bowman's capsule.
(iv) Ultrafiltrate/nephric filtrate is plasma minus proteins.

The correct option is D (i), (ii), (iii), and (iv)
(i) A kidney receives the blood by a renal artery that arises from the dorsal aorta. All the capillary network s return blood containing useful materials to the renal venules which join to form a renal vein that opens into the inferior vena cava.

(ii) The ascending limb is impermeable to water along its entire length. The filtrate becomes hypotonic to plasma due to loss of inorganic ions and passes into the DCT.

(iii) The Bowman's capsule is a large, double-walled cup. The podocytes forming the inner wall of the Bowman's capsule has gaps, the slit- pores, between them.

(iv) The separation of small molecules and ions from large molecules and cells in the blood is termed ultrafiltration. It contains sodium, potassium and chloride ions, glucose, amino acids and a large amount of water.

So, the correct answer is '(i), (ii), (iii), and (iv)'.