Sources of Light

What is an artificial source of light?

Most objects around us are sources of light.
 

We depend on light energy for our food.

Sunlight is the basic requirement of plants during _____.

Name the energy used by plants for photosynthesis.

Neena planted a sapling in a pot containing moist soil. She placed that pot in the dark. She watered the plant daily but it did not grow. Why did the plant not grow ?

The moon helps the plant to make their food.

Name the food made by a plant.

Plants change light energy into food energy.

Green plants make their food even at night.

Name the following with the help of missing letters from the bracket:

It needs water and makes its own food. It is _____.

What will happen if a green plant is kept in a closed, dark room for a long time?

The process through which a leaf prepares food.

How do plants get their food?

We can see objects because light travels _____.

The energy needed by leaves to make food is obtained from

The sun is a luminous object. 

The light travels with a lower speed in air than in water.

Identify the following picture. Answer the question that follow.

What type of energy does it provide?