Malpighian body or renal corpuscle is

The weight of a human kidney is approximately ....... grams.

The $pH$ value of human urine is:

In humans,the kidneys are of which type?

Draw a neat and labelled diagram of the human excretory system.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Nephrons are of two types: Cortical and Juxta-medullary,based on their relative position in the cortex and medulla.
Reason $R$: Juxta-medullary nephrons have a short loop of Henle,whereas cortical nephrons have a longer loop of Henle.
In the light of the above statements,choose the correct answer from the options given below: