21.

Match the following columns and select the correct option.

Column I	Column II
A. Panthera tigris	(i) Mango
B. Magnifera indica	(ii) Common Indian frog
C. Musca domestica	(iii) Cockroach
D. Periplaneta americana	(iv) Tiger
E. Rana tigerina	(v) House fly

 

• A- (ii); B- (v); C- (i); D- (iii); E- (iv)

• A- (iv); B- (i); C- (v); D- (iii); E- (ii)

• A- (ii); B- (v); C- (iii); D- (i); E- (iv)

• A- (iv); B- (i); C- (v); D- (ii); E- (iii)

The first stable product of Calvin cycle is

• 3- phosphoglycerate

• 1, 3 biphosphoglycerate

• glyceralydehyde - 3 phosphate

• ribulose - 5 - phosphate

Assertion : Adrenaline is called an emergency hormone.

Reason : It acts on the cells of skeletal, cardiac, smooth muscles, blood vessels and fat cells

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

Assertion : Cork prevents the loss of water by evaporation.

Reason : Cork cells contain tannins.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : In cockroach respiratory gases directly comes in contact with the various organs of the body. 

Reason : Cockroaches do not have respiratory pigment.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : While on going down the loop of Henle, the filtrate becomes hypotonic.

Reason : The descending limb of loop of Henle is impermeable to both water and electrolytes.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : Shrinkage of the protoplast of a cell occurs under the influence of hypertonic solution.

Reason : Hypertonic solution causes plasmolysis.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : Bile is essential for the digestion of lipids.

Reason : Bile juice contains enzymes bilirubin and biliverdin.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of the assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Emphysema is a chronic disorder in which alveolar walls are damaged.

Reason : Emphysema is closely related to cigarette smoking.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Due to pollution atmospheric concentration of CO₂ is increasing which will be harmful for C₄ plants whereas productivity is going to increase for C₃ plants.

Reason : C4 plants have greater efficiency for CO₂ as CO₂ is fixed by PEP oxygenase.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.