Question

Green plants use _____ and ____ to make food. Fill in the blanks with suitable word.

Answer 1

Plants are mostly autotrophs, i.e., they prepare their own food through photosynthesis.
They require carbon dioxide, water, chlorophyll and sunlight for this process called photosynthesis.

Complete answer:
Green plants are also called Producers, because they can prepare their own food. For this, they need - water and nutrients from the soil, chlorophyll, sunlight, carbon dioxide, an optimal temperature and air.
Chlorophyll is a green pigment, and is present in all of the green plants. It provides green coloration to the plants.
It is required for photosynthesis, which is the process by which the light energy is converted into chemical energy.
It absorbs energy from the sunlight, and this energy is then used to convert carbon dioxide into carbohydrates.
This process’s by-product is the oxygen, which we breathe in to survive.
Roots of the plants absorb the water and minerals from the ground and the leaves absorb carbon dioxide from the atmosphere / air.
They then convert these ingredients into food by using the sunlight’s energy. This process is known as - photosynthesis. It literally means - to make out of light.
The foods produced are - starch as well as glucose.

So, to answer the question, we can say that the green plants use Chlorophyll and Sunlight to make food.

Note:

The process that creates the actual food for plants is known as a Dark Reaction, since it does not require light.
The light energy is converted into chemical energy, instead of being used directly. Out of all the light which falls on the leaves, only 5% is used for Photosynthesis. And only 30-50% of this energy is stored as chemical energy in the plant cells.