2. Dogs give birth to puppies; cats give birth to kittens. This process by which animals produce other animals of their kind is called ___________.

3. What kind of exercise helps the heart and lungs?

4. If you are exposed to garbage, what kind of illness would you probably get?

5. Which of these minerals is needed by your bones?

6. It allows you to bend your knees.

7. How many bones are in the adult human body?

8. What process does an animal undergo when the sperm and egg cells unite?

9. What do you call the spines and thorns of some plants which they use to protect themselves from danger?

10. When does evaporation take place?

AVERAGE ROUND

1. The contraction and relaxation of muscles cause bone movement. A pair of muscles work against each other. While one contracts the other relaxes. What happens to the muscles when it contracts?

AVERAGE ROUND

2. What is the main cause of tides?

AVERAGE ROUND

3. What kind of disease is given by mice?

AVERAGE ROUND

4. Man interferes with the balance of nature when he _______.

AVERAGE ROUND

5. In which liquid is nail polish soluble?

DIFFICULT ROUND

1. What do you call the imaginary line on which the Earth turns and which runs from pole to pole?

DIFFICULT ROUND

2. What is the hardest natural substance on earth?

DIFFICULT ROUND

3. What is a material that will not carry an electrical charge called?

DIFFICULT ROUND

4. How many teeth does an adult human have?

DIFFICULT ROUND

5. What is the most abundant gas in the Earth’s atmosphere?