Explain lock and key hypothesis. Give one experiment to support your answer.

Explain the lock and key hypothesis is of enzyme action.

Explain the lock and key hypothesis of enzyme action.

Explain lock and key theory of enzyme.

What are antihistamines? Do antihistamines work as antacids? Give proper explanation in support of your answer.

Two unbiased dice are thrown .Let A be the event that the sum of the digits shown on the two dice is 5 and B be the event that at least one of the dice shows up a 5. Are the two events i. mutually exclusice? (ii) exhaustive? Give arguments in support of your answer.

Three different numbers a, b, c are both in A.P. G.P. - is it possible ? Give reasons in support of your answer.

when are two objects just resolved? Explain. How can the resolving power of a compound microscope be increased? Use relevant formula to support your answer.

How will be resolving power of a microscope be changed, if -(a) the wavelength of the incident light decreases (b) diameter of the objective lens decreases? Give reasons, in support of your answer.

What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.