Excretion 1

1 . Towards the centre of the inner convex surface of the kidney is a notch called hilum through which ureter, blood vessels and nerves enter.

2. Each kidney of an adult human measures 10-12 cm in length with an average weight of 120- 170 g

3. Nephron is simple tubular structure .

4.Blood from the glomerulus is carried away by an afferent arteriole.

• 3 statement are correct

• 2 statement are incorrect

• 3 statement are incorrect

• 2 statement are correct

Which carries maximum amount of Urea?

• Renal artery

• Renal vein

• Hepatic vein

• Hepatic artery

Statement 1 - Ammonia is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions.

Statement 2 - Kidneys play a significant role in its removal.

• Both statement are true

• Both statement are not true

• Statement 1 is correct but Statement 2 is false

• Statement 2 is correct but Statement 1 is false

On an average, .....................ml of plasma is filtered by the kidneys per minute

• 5 L

• 1100 -1200 ml

• 1/5 of cardiac output

• 600 -660 ml

Which is not a part of filtration membrane ?

• Simple squamous epithelium of Glomerular capillary

• epithelium of Bowman’s capsule

• a basement membrane

• endothelium of Bowman's capsule

S 1 : Many bony fishes, aquatic amphibians and aquatic insects are ammonotelic in nature.

S 2: Ureotelism and uricotelism help in conservation of water and needed for terrestrial adaptation.

• S 1 is correct but

  S 2 is incorrect

• S 1 is incorrect but S 2 is correct

• Both statements are correct

• Both statements are incorrect

Which point is incorrect regarding Flame cells ?

• excretory organ in flatworms

• Helps in osmoregulation

• other name is Nephridia

• tubular structure

Assertion (A) - Glomerular filtration is considered as process of Ultrafiltration.

Reason (R) - Almost all the constituents of plasma except plasma proteins and Blood cells pass onto the lumen of the Bowman’s capsule.

• Both A and R are true and R is correct explanation of R

• Both A and R are true and R is not correct explanation of R

• Only A is true

• Only R is true

Statement 1: To maintain a desired osmolarity some amount of urea may be retained in the kidney matrix of some animals.

Statement 2: A fall in GFR can activate the JG cells to release rennin which can stimulate the glomerular blood flow and thereby the GFR back to normal.

• Statement 1 is correct but statement 2 is incorrect

• Statement 1 is incorrect but statement 2 is correct

• Both statements are correct

• Both statements are incorrect

Which segment is responsible for maximum water and ion reabsorption?

• DCT

• Collecting duct

• Henle's loop

• PCT