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NEET Biology Solved Question Paper 2007

Multiple Choice Questions

11.

Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport?

Cell membrane
Mitochondria
Dictyosome
Endoplasmic reticulum

12.

Thickening of arteries due to cholesterol deposition is

arteriosclerosis
rheumatic heart
blood pressure
cardiac arrest

13.

An example of competitive inhibition ofan enzyme is the inhibition of

succinic dehydrogenase by malonic acid
cytochrome oxidase by cyanide
hexokinase by glucose-6-phosphate
carbonic anhydrase by carbon dioxide

14.

Which of the following is the connecting link between glycolysis and Krebs cycle?

Acetyl Co- A
Oxalosuccinic acid
Pyruvic acid
Citric acid

15.

Which of the following contain $β$ -1, 4 linkage?

Maltose
Sucrose
Lactose
Fructose

16.

Which statement is true?

Adenine has 4 nitrogen atoms.
Cytosine has 3 nitrogen atoms
Guanosine has 3 nitrogen atoms
Uracil has 5 nitrogen atoms

17.
Which of the following helps in ascent of sap?

Root pressure

Transpiration

Capillarity

All of these

All of these

Water is mainly absorbed by roots which goes upwards so as to replace water loss in transpiration and to be used in photosynthesis. This upward movement of water from roots to leaves through stem against force of gravity is cal led ascent of sap.

There are many theories in order to understand the ascent of sap.

Root Pressure Theory- Root pressure is developed when rate of absorption is more than rate of transpiration and so water is pushed up in the tracheary elements.
Capillary Force Theory- According to this, xylem vessels act as minute capillaries and water rises in these capillaries due to capillary action or surface tension.
Transpiration Pull Theory- Due to water loss by transpiration suction pressure is increased and water is absorbed from adjacent xylem vessels of leaves and thus sap in under tension.