How does Monarch butterfly defend itself from predators? Explain.

2

(a)

Why are a fig tree and its partner wasp considered a good example of mutualism?

2

(a)

How do desert lizards cope with temperature variations in their environment? Explain.

2

(a)

Write the normal body temperature of humans.  How is it maintained during summers?

2

(a)

When is an organism called a 'conformer'? Explain with the help of an example.

2

(a)

Explain the response of all communities to environment over time.

2

(a)

How do seals adapt to their natural habitat? Explain.

2

(a)

Mention the changes the koel must have undergone in order to achieve brood parasitism, during the course of evolution.

2

(a)

How does the human body maintain a constant temperature both in summers and winners? Explain.

2

(a)

How do organisms which cannot migrate tend to overcome adverse environmental conditions?  Explain taking one example each from vertebrates and angiosperms, respectively.

2

(a)

Distinguish between ectotherms and endotherms.

2

(a)

Define population and community.

2

(a)

A population of 100 spotted deer was living without any carnivores in an enclosure of a few hectares of rich tropical forest land. Deer census was taken after a few years. Now study the graph given below and answer the questions that follow:

(a) Identify the curve that represents the deer population.
(b) Is it a realistic one? Justify.

2

(a)

Define heliophytes and sciophytes. Name plant from your locality that is either heliophyte or sciophyte.

2

(a)