1. What is meant by hydrosphere?

Ans. Every kind of collection of water on the surface of the earth is called a hydrosphere.

2. What is the device that can help blind people read newspapers and books?

Ans. Optophone is a device that can help blind people read newspapers and books.

3. What causes irritation after an ant bite?

Ans. Ant stings contain Formic acid that causes irritation.

4. How many bones are there in the human body from elbow to wrist?

Ans. The human body has two bones from the elbow to the wrist.

5. How many bones are there in a human hand?

Ans. The human body has a total of 27 bones in one hand.

6. Which part of the body of a human has the most bones?

Ans. The human body has the most bones in the hand.

7. How many bones are there in the human face?

Ans. There are a total of two bones in the human face.

8. What is the name of the person who invented the loudspeaker?

Ans. The loudspeaker was invented by Rice Kellogg in 1924.

9. What is the main food of fish?

Ans. The main food of fish is plankton which grows naturally in water.

10. What kind of creature is the one whose legs reappear after being cut off?

Ans. Starfish is a living creature whose legs reappear after being amputated.

11. Which is the fish that has both eyes on the right side?

Ans. The placenta is the fish that has both eyes on the right side.

12. What is an animal that hunts with its teeth but swallows food without chewing with its teeth?

Ans. The fish hunts with its teeth but swallows its prey without chewing with its teeth.

13. What is it that helps a fish swim?

Ans. Fins help the fish swim.

14. What is the name of this fish which is two to three feet long?

Ans. Rahu fish. Fish are cold-blooded.