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Homework Assignment 46 | Class 7 BBC Compacta Solutions PDF Download


1 (a) Cubs of the polar bear are born blind.


1 (b) The whole family stays in a den when the cubs are born.


1 (c) When her cubs weigh about 10 to 15 kg, the mother breaks the entrance to the den.


1 (d) The family spends time nearby outside the den for about 12 to 15 days.


1 (e) A fully grown elephant may stand four metres high.


1 (f) The Indian elephant is more easily tamed and trained than the African one.


2 (a) Of all the land animals, the elephant is the most intelligent and the largest.


2 (b) In some ways, the elephant is the most powerful animal.


3 (a) Snakes are covered with scales of various colours.


3 (b) The snake is one reptile that has no legs.


3 (c) It has very strong muscles that help it move.


3 (d) Other animals move quite slowly compared to snakes.


3 (e) The snake has a long forked tongue and uses it to smell things.


4 (a) All the other colours can be produced by mixing the primary colours.


4 (b) The primary colours in paints and printing inks are blue, red, and yellow.


4 (c) The primary colours of light are different—red, blue, and green.


4 (d) Using these three colours, all the other colours can be obtained.


5 (a) A mineral is a substance that is found in nature.


5 (b) It is made up of substances that were never alive.


5 (c) It has the same chemical makeup wherever it is found.


5 (d) The atoms of a mineral are arranged in a regular pattern and form solid units called crystals.


6 (a) Thermal expansion of ocean water because of warming raises the global sea level.


6 (b) The health of corals is jeopardised by warm waters.


6 (c) Ocean warming is a serious risk to food security.

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