There are organisms, which can prepare their food from carbon dioxide and water in the presence of sunlight and chlorophyll. Organisms, which can make their own food by the process of photosynthesis are known as autotrophs. Autotrophs require the presence of sunlight, chlorophyll, water and carbon dioxide to make their food. Example- all green plants are autotrophs.

Organisms that depend on plants or other animals for their food are called heterotrophs. Different types of heterotrophic nutrition are: saprotrophic, parasitic, symbiotic and holozoic. These organisms are incapable of performing photosynthesis, and thus, they are dependent on autotrophs. Example- Humans and animals.

It is a green coloured pigment present in leaves of plants. It helps in the process of photosynthesis by which green plants can make their own food. It is present inside a cell organelle known as chloroplast.

Every living organism obtained their energy from a different type of food sources. The organisms which are dependent on plants for their food are called herbivores. Example- Cow, Goat, Deer, Sheep, etc.

Living organisms (heterotrophs) obtained their nourishment from different sources. Those organisms which only eat the flesh of other animals are known as carnivores. They are also called meat-eaters. Example- Lion, Tiger, Wolf, etc.

Living organisms (heterotrophs) obtained their nourishment from different sources. Organisms which eat both plants and animals or food derived from them are called omnivores. Example- Humans, Crow and Cockroach.

During the various metabolic process, the exchange of gases occurs in plants; in these processes, stomata are very helpful. These are small openings present in leaves, which are responsible for the exchange of gases and water vapour with the atmosphere.

There are small openings present in leaves known as the stomata, which are responsible for the exchange of gases and water vapour with the atmosphere. The stomatal opening in leaves is guarded by two kidney-shaped cells known as guard cells. It regulates the opening and closing of the stomata.