Heat, Light, Electrical Energy

Q.

Name the gas/gases when an electric current is passed through water.

1. Hydrogen and oxygen

2. Oxygen and hydrogen

3. Hydrogen and chlorine

4. Chlorine and oxygen

Q.

How does increase or decrease in temperature affect photosynthesis?

Q.

What do you understand by the term “photo chemical reaction”.

Q.

Briefly explain how photo chemical reaction take place in the plants.

Q.

In modern matches, why do we need to rub the bulb on the matchbox?

1. Sulphur

2. Potassium Chlorate

3. Both Potassium Chlorate and Sulphur

4. Nitrogen

Q.

Photosynthesis takes place is the presence of :

1. electricity
2. sunlight
3. heat
4. negative catalyst

Q. Why photosynthesis is a chemical reaction?
[TEXTBOOK QUESTION -V(10)]