Revision 1

Q.1 Animals like a camel can survive in a desert. Which of these features in the camel helps them to survive in the desert?

• a) Hump of the camel produces food

• b) Long neck helps to store more water

• c) Long legs protect them from heat of the sand

• Thicker skin helps in the transpiration of more water

‘Plants show movement’. State yes/no. Justify your answer.

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‘Bacteria and fungi live in the soil and degrade the organic matter in the soil’.

From the above statement, identify the biotic and abiotic components

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Cactus in a desert lacks leaf. Instead of leaves, its thick stem is responsible for photosynthesis. Why are leaves absent in these plants?

• a) Leaves cause increased loss of water due to transpiration

• b) to save the plants from predators

• c) leaves would have wilted easily in the strong heat of the sun

• d) leaves are reduced to spines to protect from cold nights in the desert​

a) Snakes do not move in a straight line.Give a reason for your answer.

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In cockroaches, the body parts helping in movement are

• three pairs of legs and two pairs of wings

• (b) two pairs of legs and two pairs of wings

• c) two pairs of legs and three pairs of wings

• (d) none of these

How can fish swim around easily in the water?

• (a)Due to small-sized body

• (b)Due to streamlined body

• (c)Due to the presence of thin skin

• (d)Due to the presence of scales on their body

One of the following does not have a hinge joint

• jaw

• elbow

• Knee

• shoulder

The two bones of the lower arm are

• tibia and fibula
• femur and humerus
•  ulna and radius
• humerus and radius

Which of the following are ball and socket joints?---
A) elbow joint
B)shoulder joint
C) Knee joint
D)Hip joint

•  a) A and B  
• b) B and C
• c) A and C
• d) B and D