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Answer 1

Answer:

1.knee

2.thermocol

3.heating

4.eraser

5.air

6.32

7.respiration

8.sandy soil

Answer 2

Explanation:

1. Hinge joint is found in knee.

• Hinge joint is made up two or more bones, it is a type of synovial joint.

2. Select the one which is an insulator: thermocol

• Every option is a conductor of electricity, apart from thermocol, as it is a insulator.

3. Magnets lose their property on hammering.

• When magnets are beaten by hammer, they lose power so they are demagnetized.

4. Material that is not attracted by a magnet: eraser

• Magnets attract metals, materials made of copper, iron, etc.

5. Birds and insects fly due to the presence of air.

• Birds required air to fly and fast movement as they cannot flap their wings continuously.

6. Number of vertebrae in our backbone is 33.

• Vertebrae are the individual bones and combine and form our backbone.

7. Aquatic animals use dissolved oxygen for respiration.

• Aquatic animals breathe through lungs in water where oxygen is dissolved, oxygen is there always in water.

8. An example of an incandescent body is electric bulb.

• Incandescent bodies emits light when heated to a very high temperature.