5. What role do leaves and roots of green plants play during photosynthesis?
Answers
Plants use their leaves to make food. During photosynthesis, plant leaves take in carbon dioxide from the atmosphere. Using the energy from sunlight, this is combined with water drawn up from the roots to make glucose. Oxygen is also produced in this chemical reaction and exits the leaves into the surrounding air.
Answer:
The process of making of food by green plants in the presence of sunlight and chlorophyll is known as photosynthesis. Photosynthesis is the combination of two words- Photo + Synthesis. ‘Photo’ means light and ‘Synthesis’ means to make.
Step-by-step explanation:
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Plant Nutrition
Photosynthesis
The process of making of food by green plants in the presence of sunlight and chlorophyll is known as photosynthesis. Photosynthesis is the combination of two words- Photo + Synthesis. ‘Photo’ means light and ‘Synthesis’ means to make.
Process of food making in green plants:
Green plants make their food themselves. Green leaves make food from Carbon dioxide and water in the presence of sunlight and chlorophyll.
Leaves have several tiny pore-like structures on the lower surface. These pores are called stomata. Leaves absorb carbon dioxide from air, through these pores. Water is transported to leaves through very thin pipelines from the roots. These pipelines are present throughout the plant, i.e. from roots to branches and leaves. These pipelines are known as Xylem. Xylem is a type of tissue. You will learn about tissues in your higher classes. Chlorophyll is a green pigment that is found in green leaves. Chlorophyll absorbs sunlight and gives energy. Chlotrophyll is inside chloroplast. Chloroplast is the site of photosynthesis. At the end of photosynthesis, carbohydrate and oxygen are formed. Carbohydrate is used as food and oxygen is emitted out to the atmosphere. This whole process of making food by plants is called photosynthesis.
The reaction that takes place in the process of photosynthesis can be written as:
6CO2 + 6H2O → C6H12O6 + 6O2
Carbohydrate is ultimately converted into starch and stored in leaves. From leaves, starch is transported to different parts of a plant. Starch is a type of carbohydrate.
Leaves are known as the kitchen or food factory of plants because photosynthesis takes place in leaves. Leaves look green because of the presence of chlorophyll.
Besides leaves, photosynthesis also takes place in other green parts of the plant, such as in green stems. Chlorophyll is necessary for photosynthesis, hence photosynthesis takes place only in green plants.