Assertion If a particular crop is destroyed due to some disease, the herbivores in that area do not perish.
Reason Alternative pathways provided by the food web.

These questions consist of two statements each, printed as Assertion and Reason.While answering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:heart pace-maker is a life saving device when the normal heart rate of 72-80 drop to 30-40 due to disease or some other cause. Reason:The pace-maker electrically stimulates the contractile heart walls.

Assertion: Study of the family history about inheritance of a particular trait provides an alternative of control crosses. Reason: Control crosses that can br performed in pea plant are not possible in case of human beings.

Assertion : Some diseases that attack in childhood do not attack again. Reason : Memory cells play an important role.

Assertion : Some diseases that attack in childhood do not attack again. Reason : Memory cells play an important role.