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Grade: IV, Unit- 6, , Science, The Green Plants

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III. Answer the following questions., 1. What are stomata? How do they help the plant?, The underside of a leaf contains millions of tiny openings. These tiny, openings are called stomata., The stomata let air flow in and out of the leaf., 2. Define photosynthesis. Name the raw materials needed by plants, for it., The process by which leaves use sunlight to convert water and carbon, dioxide into food is called photosynthesis., Plants use sunlight, water, and carbon dioxide present in the air as raw, materials to make their food., 3. How do green leaves get things needed for photosynthesis?,  Water is absorbed by the roots and carried through the stem to the, leaves.,  When light falls on the leaves, it is absorbed by chlorophyll.,  Carbon dioxide is taken in through stomata., 4. How would you test a leaf for starch?, Pluck a leaf from a plant that was out in the sun and boil it in water., Then dip it in spirit. Wash it in cold water., Now put a few drops of iodine solution on the leaf. The iodine solution, turns the colour of the leaf bluish black., 5. Describe how plants and animals are depend on each other., Green plants are the main producers of food. Animals depend on these, plants for their food. Besides, plants also give out oxygen, which is, needed by animals to breathe., Animals in return give out carbon dioxide, which is needed by the plants, for photosynthesis.