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3. How would you test the presence of starch in leaves?
4. Give a brief description of the process of synthesis of food in green plants.
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Answers
Answer:
boil leaf in alcohol and add iodine solutions too it if it turns to blue black colour it contains starch if not it doesn't contain
Explanation:
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Answer:
3) We will take Iodine solution and pour it on the leaf, the leaf will turn blueish.
This confirms the presence of starch.
4)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.
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