(a) Explain with the help of a graph, the population growth curve when resources are
(i) limiting and
(ii) not limiting.
(b) 'Nature has a carrying capacity for a species'.  Explain.

5

(a)

List the different ways by which organisms cope or manage with abiotic stresses in nature.  Explain any three ways listed.

5

(a)

List any three important characteristics of a population and explain.

5

(a)

Define commensalism.  Describe any four examples.

5

(a)

What is mutualism? Describe any four examples.

5

(a)

What is adaptation? Describe the adaptation of plant and animal in desert.

5

(a)

Ramesh visited a National Park on a school trip where he saw tiger eating a deer. He got disturbed and asked his teacher why is he doing so. His teacher replied that it is natural population controlling phenomenon.
(i) Which type of interspecific interaction is found between tiger and deer?
(ii) State the role of predators
(iii) What other type of population interaction are seen in nature?
(iv) State the values of Ramesh towards animals

5

(a)

(a) Name the two growth models that represent population growth and draw the respective growth curves they represent
(b) State the basis for the difference in the shape of these curves.
(c)Which one of the curves represents the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer

5

(a)

Neha's mother brought a big cactus plant from a nursery. She told Neha not to water the plant daily. Neha was confused. Explain the reason for not watering the plant daily and what will happen if she will water the plant daily? Do you know some animals who are also of the same nature?

5

(a)