Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Amount of oxygen supplied by 100 mL arterial blood while passing through the tissues is

  • 0.4 - 0.6 mL

  • 4 - 6mL

  • 14 - 15 mL

  • 19 - 20 mL


22.

Cholecystokinin stimulates the secretion of

  • bile

  • gastric juice

  • pancreatic juice

  • succus entericus


23.

In a normal adult human, the average cardiac output (stroke volume) is

  • 47 mL

  • 70 mL

  • 5 L

  • 3.3 L


24.

Bone is mainly composed of

  • iron and phosphorus

  • sulphur and calcium

  • calcium and phosphorus

  • calcium and magnesium


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25.

Which one of the following is incorrect for Atherosclerosis?

  • Constriction of arterial luman reduces the blood flow

  • Loss of dilatation ability of the arterial wall and its rupture

  • Cholesterol deposition at the inner wall of the artery

  • Proliferation of the vascular muscles


B.

Loss of dilatation ability of the arterial wall and its rupture

Atherosclerosis is a condition of wall thickening and narrowing of lumen of medium and large arteries due to formation of atheromas or plaques of cholesterol of at their inner wall. The smooth muscles also proliferate probably caused by release of Platelet Derived Growth Factor (PDGF). Atherosclerosis leads to hypertension, reduced blood supply, angina, heart attack or stroke etc.


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26.

Which one of the following statement is incorrect?

  • Glucagon is secreted by pancreas

  • Androgen is produced by ovary

  • Thyroxine is secreted by thyroid

  • Oxytocin is secreted by pituitary


27.

Juxtaglomerular apparatus is made up of

  • juxtaglomerular cell, macula densa and lacis cell

  • juxtaglomerular cell, Purkinje cell and chied cell

  • juxtaglomerular cell, lads cell and myoepithelial cell

  • juxtaglomerular cell, macula densa and Argentaffin cell


28.

Which vitamin helps in blood coagulation?

  • Vitamin- K

  • Vitamin- C

  • Vitamin- A

  • Vitamin- D


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29.

Which one of the following is mainly responsible for the second heart sound?

  • Closure of atrioventricular valves

  • Opening of atrioventricular valves

  • Closure of semilunar valves

  • Thrust of blood on ventricular wall during atrial contraction


30.

Brunner's gland is present in

  • duodenum

  • jejunum

  • ileum

  • rectum


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