31.

Assertion : Histamine is involved in allergic and inflammatory reactions.

Reason : Histamine is a vasodilator.

• 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 number of cells in a multicellular organism is inversely proportional to the size of body.

Reason : All the cells in the biological world are of same size.

• 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 : Systematics is the branch of biology that deals with classification of living organism.

Reason : The aim of classification is to group the organisms in an orderly manner.

• 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 collenchyma is a thick walled living tissue.

Reason : The collenchyma is thickened due to the deposition of pectin.

• 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 : When six molecules ofcarbon dioxide participate in photosynthesis, 12 molecules of NADP and 18 ATP are used up, forming one hexose molecule. 

Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.

• 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.

Which of the following is a component of cell mediated immunity?

• B-cells

• $\mathrm{\alpha }$- cells

• T-cells

• Both (a) and (c)

Cyclosporine is used as

• clot buster

• immunosupppressant

• prophylactic for viruses

• prophylactic for marasmus

The cranial capacity was largest among the

• Peking man

• Java ape man

• African man

• Neanderthal man

A point mutation comprising the substitution of a purine by pyrimidine is called

• transition

• translocation

• deletion

• transversion

Frameshift mutation occurs when

• base is subsituted

• base is deleted or added

• anticodons are absent

• none of these