True, because photosynthesis is important for the existence of life on the earth. Photosynthesis is important process as it is provides food to all living organisms and maintains CO₂ - O₂ balance of nature.

The following sketch shows that the plants are the ultimate source of food.

Plants prepare their own food by the process of photosynthesis. Leaves of the plants have green pigment called chlorophyll, which helps them to capture the energy of the sunlight. The plants synthesise their food from carbon dioxide and water in the presence of sunlight. This process is called photosynthesis. The reaction for the process of photosynthesis can be shown as follows:

During photosynthesis, food is synthesised and oxygen is released in the process.

The presence of starch, a carbohydrate in leaves can be tested by iodine test. Iodine turns starch solution into blue-black colour. Pour few drops of dilute iodine solution on a boiled leaf. The leaf becomes blue-black in colour which proves the presence of starch in it.

Differences between parasites and saprotrophs

The organisms need to take food to build their bodies, to grow, to repair damaged part of their bodies and to obtain the energy to carry out life processes. Food provide resistance to fight against diseases and protection from different infections.

Leaves are referred to as food factories of plants. This is because, leaves synthesise food by the process of photosynthesies.

Guard cells help in controlling the opening and closing of stomata for gaseous exchange.

Stomata are the tiny pores present on the surface of leaves through which gaseous exchange takes place in plants.

(a) Sunlight
(b) Carbon dioxide

The mode of nutrition in plant is autotrophic, i.e. they synthesise their own food.

In both the plants, shoot system and leaves are above ground. They prepare food through photosynthesis and transport it to the underground part for storage.

(a) This process is known as crop rotation. All the plants/crops grown in soil use the minerals present in soil for their own use. This continuous usage depletes the concentration of mineral in soil.
(b) After growing leguminous plants, the mineral content of soil is restored and enriched to new level. Yes, the benefit of leguminous plant is the re-enrichment of soil minerals.
(c) Asha is observant, sincere and interested in applying her knowledge to situations.

Animals like tiger, wolf, lion and leopard are carnivores and do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc., which are dependent on plants for food.
If there are no plants, herbivorous animals will not survive and ultimately animals like tiger, wolf, lion and leopard will have nothing to eat.

The process by which green plants can prepare their own food is called photosynthesis. Green plants possess chlorophyll in their leaf and utilises carbon dioxide (from air) water, minerals (from soil, through root) as raw material and sunlight as source of energy and convert light energy into chemical energy. The food thus synthesied is in the form of starch (carbohydrate). The overall reaction for photosynthesis can be given as follows: