21.

Which of the following are uricotelic animals?

• Rohu and frog

• Camel and frog

• Lizard and crow

• Earthworm and eagle

The vitamin nicotinamicle can be synthesized in our body from

• tyrosine

• tryptophan

• valine

• phenylalanine

Which of the following would not give Fehling's test ?

• Glucose

• Sucrose

• Fructose

• Lactose

Assertion : Study of biology requires basic knowledge of chemistry and physics.

Reason : Living organisms are made up of atoms and molecules which follow chemical and physical laws.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : Living organisms are regarded as closed systems.

Reason : Energy of living organisms cannot be lost or gained from the environment.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : Death is regarded as the most important regulatory process on earth. 

Reason : It avoids overcrowding, caused continuous reproduction.

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

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

• If assertion is true but reason is false

• If both the assertion and reason are false

Assertion: WBCs accumulate at the site of wounds by diapedesis.

Reason : It is the squeezing of leucocytes from
the endothelium.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion: Specialization ofcells is advantageous for the organism.

Reason : It increases the operational efficiency of an organism.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : The imbalance in the concentration of Na⁺, K⁺ and proteins generates the resting potential.

Reason : To maintain the unequal distribution of Na⁺ and K⁺, the neurons use electrical energy.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : The regulation of RBC production is accompanied by the kidneys.

Reason : Erythropoietin hormone circulates to the red bone marrow, where it increases stem cell mitosis and speeds up the development of RBCs.

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

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

• If assertion is true but reason is false.

• If both the assertion and reason are false.