Question

18.what is process thephotosynthesis of a plant? Explain.​

Answer 1

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Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later is used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.

$\color{blue}{process of photosynthesis}$

• During the process of photosynthesis, carbon dioxide enters through the stomata, water is absorbed by the root hairs from the soil and is carried to the leaves through the xylem vessels. Chlorophyll absorbs the light energy from the sun to split water molecules into hydrogen and oxygen.
• The hydrogen from water molecules and carbon dioxide absorbed from the air are used in the production of glucose. Furthermore, oxygen is liberated out into the atmosphere through the leaves as a waste product.
• Glucose is a source of food for plants that provide energy for growth and development, while the rest is stored in the roots, leaves, and fruits for their later use.
• Pigments are other fundamental cellular components of photosynthesis. They are the molecules that impart colour and they absorb light at some specific wavelength and reflect back the unabsorbed light. All green plants mainly contain chlorophyll a, chlorophyll b and carotenoids which are present in the thylakoids of chloroplasts. It is primarily used to capture light energy. Chlorophyll-a is the main pigment.

The process of photosynthesis occurs in two stages:

Light-dependent reaction or light reaction

Light independent reaction or dark reaction