Grade 10 Difficult Level

1. 1. What do you call the condition of the atmosphere for a short period of time?

2. 2. What form of energy is shown by a candle flame?

3. 3. Who developed the planetary model of the atom?

4. 4. Exchange of air occurs in _____ which are also known as “air sacs”.

Which of the following organisms do NOT carry on photosynthesis?

• A. Plants                                                

• B. algae                  

• C. Some bacteria

• D. Animals