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Each relationship: 1 Mark
1. Climate plays an important role in the life of living organisms. It is the weather conditionin an area over a long period of time.
2. It brings about certain changes in theshape, structure and function of the animal body so that it can live and survive in those climaticconditions. Hence organisms will adaptto those climatic conditions.
3. These features and habitats help animals to adapt to their surroundings whichresults inthe process of evolution, which is the heritable characteristics of biological populations over sucessive generations.

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Definition: 1 Mark
Structure: 1 Mark
Rainfall is measured by an instrument called the rain gauge.
It has a well-defined structure. It basically consists of a measuring cylinder with a funnel on the top to collect rainwater.

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Statement: 1 Mark
Explanation: 2 Marks
Yes, all the changes in the weather are caused by the Sun.
1) The Sun is a huge sphere of hot gasesat a very high temperature. Even thoughthe distance between the Sun and the Earth is very large, the energy sent out by the Sun is the source of all the heat and light on the earth. So the Sun isthe primary source of energy that causes changes in the weather.
2) Energy absorbed and reflectedby the Earth's surface, oceans and the atmosphere play an important rolein determining the weatherat any place.

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Each point: 1 Mark
1. The seasonal movement of animals from one place to anotherto avoid harsh climatic conditions is known as migration.
2. Birds travel long distances to avoid harsh, cold weathers and it is necessary to protect them.
3. They travel in search of food as well. Certain kinds of butterflies also show migratory behavior.

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Each point: 1 Mark
1. They use theirtrunk as nose because of which they have a strong sense of smell. The trunk is also used for picking up food.
2.Large ears help them in hearing even very soft sounds. They also help the elephant to keep cool in the hot and humid climate of the rainforest.
3. They have thick padded feet which help them in moving silently.

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Each point : 1 Mark
1. Polar bears have white fur so that they are not easily visible in the snowy white background. It protects them fromtheir predators. It also helps them in catching their prey.
2.To protect them from extreme cold, they have two thick layers of fur. They also have a layer of fat under their skin.
3.Its paws are wide and large, which help it not only to swim well but also walk with ease in the snow.
4.It has a strong sense of smell so that it can catch its prey for food.
5. It has long, curved and sharp claws which help it to walk on ice.

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Each point: 1 Mark
Tropical rain forests have a large population of animals because:
1. The tropical rain forests have favourable climatic conditions for animals.
2. The tropical rain forest has plenty of different types of easily available food.
3.The canopy offers shelter and hiding places, providing for interaction between different species.

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Definition: 1 Mark
Elements:1 Mark
Weather is the state of the atmosphere at a particular place over a short period of time.
Temperature, humidity, rainfall, wind-speed etc. are the elements which determine the weather of a place.

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Each point:0.5 Mark
The climate at any place is affected by the following factors:
1. Distance from the equator.
2. Height above the sea level.
3. Ocean currents.
4. Direction of prevailing winds.

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Each point: 1 Mark
1. Tropical rainforests lie between the Tropic of Cancer and the Tropic of Capricorn, or 1,400 miles north and south of the Equator.
2. The rainfall in this area is distributed throughout the year, about 6-33 feet a year.
3. It remains frost free and warm all year long, with temperatures between 70° and 85°F with very little daily fluctuation.
4. Tropical rainforests are found in Western Ghats and Assam in India, Southeast Asia, Central America and Central Africa. Because of continuous warmth and rain, this region supports wide variety of plants and animals.
5. The major types of animals living in the rainforests are monkeys, apes, gorillas, lions, tigers, elephants, leopards, lizards, snakes, birds and insects.