The number of times an organism occurs within a given area of a habitat is referred to as

Which of the following pairs of organisms are photosynthetic?

The type of nutrition in which two organisms of different species live together and derive nutrients from each other is

The type of nutrition shown by spirogyra is

Animals are said to gregarious when

Raw materials required by green plants to manufacture their food are

The insect trapping movements of the leaves of the venus fly trap is a behavioural adaptation for

Which of the following is a behavioural adaptation that protects prey from predators?

The period of inactivity seen in some animals during long period of heat or drought is