Transpiration. Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). Also Refer: Photosynthesis. Structures within a leaf convert the energy in sunlight into chemical energy that the plant can use as food. Thus the light reflected in space from plants is low. A typical leaf shows three main parts: 1) petiole, 2) leaf base, and 3) leaf blade or lamina, each performing specific functions. It is the stalk that connects a leaf to the stem of the plant, it is made of complex conducting tissues called vascular tissues. As cactus leaves turned into cactus spines and lost their ability to photosynthesize, the plants had to find a new way to produce food. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. What do plant leaves do? Its main functions are photosynthesis and gas exchange. Parts of a Leaf Diagram. The epidermis aids in the regulation of gas exchange. Please update your bookmarks accordingly. This sending of water into the air also reduces the temperature. Since cacti have thick fleshy stems, these took over the job of photosynthesis. 1. A. The leaves perform the following functions: Photosynthesis. The function of leaves is to help the plant produce food by converting the energy in sunlight into chemical energy that the plant can eat. Leaf Structure and Function. We have moved all content for this concept to for better organization. Most leaves have stomata, which open and close.They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere. The process is called photosyn­thesis by which leaf manufactures food material in the presence of sunlight and green pigment- chlorophyll present in the leaf. The structures within the leaf convert the energy and make it possible for the plant to get food. Leaf pigments absorb light from the sun and store it in the form of chemical energy. The functions of modified leaves are not dealt as they carryon spe­cialised functions as discussed earlier. Petiole. It consists of the upper and lower epidermis, which are present on either side of the leaf. Most plants use their leaves to turn water, carbon dioxide, and light energy into the sugars their cells need to function. Photosynthesis is the primary function of leaves. Manufacture of food. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. Without sunlight and CO2, plants would be unable to photosynthesize, so there’s a good reason some plants go a bit crazy on leaf production! A leaf is an above-ground plant organ and it is green. Transpiration is the removal of excess water from the plants into the atmosphere. Describes the structure and function of leaves. Find out more about the role of leaves in this Bitesize Primary KS2 Science guide. The outermost layer of the leaf is the epidermis. 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