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UNIT 2 The nutrition function PLANT NUTRITION PROCESSES Natural Science 2. Secondary Education.

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Presentation on theme: "UNIT 2 The nutrition function PLANT NUTRITION PROCESSES Natural Science 2. Secondary Education."— Presentation transcript:

1 UNIT 2 The nutrition function PLANT NUTRITION PROCESSES Natural Science 2. Secondary Education

2 1a The absorption of water and mineral salts 1. OBTAINING NUTRIENTS 1b Carbon dioxide (CO 2 ) absorption 1c Photosynthesis 2. RESPIRATION Click on each process to find out more UNIT 2 Plant nutrition processes 3. SUBSTANCE DISTRIBUTION 4. ELIMINATING WASTE MATTER Natural Science 2. Secondary Education

3 Plants absorb water containing dissolved mineral salts from the soil. This is done through cells located at the end of the roots, called root hairs. The mixture of water and minerals absorbed by the roots is called xylem sap. 1a. The absorption of water and mineral salts Water and mineral salts Root hairs Xylem sap Go back to the Start menu UNIT 2 Plant nutrition processes Natural Science 2. Secondary Education

4 Carbon dioxide enters the plant mainly through very small pores called stomata, which are found on the underside of the leaves. 1b. Carbon dioxide (CO 2 ) absorption Stoma Location of the stomata on the leaf UNIT 2 Plant nutrition processes Go back to the Start menu Natural Science 2. Secondary Education CO 2

5 Photosynthesis takes place in the chloroplasts, which are located in the green parts of a plant. The water and carbon dioxide absorbed by the plant reach the chloroplasts and, with the energy from sunlight, are transformed into carbohydrates. Oxygen is produced as a by-product. The carbohidrates mix with the water in the leaf and form phloem sap. 1c. Photosynthesis Solar energy Chloroplast Xylem sap Water and carbohydrates (phloem sap) H 2 O + CO 2 O2O2 UNIT 2 Plant nutrition processes Go back to the Start menu Natural Science 2. Secondary Education

6 2. Respiration Plants are constantly respiring. This process is carried out by the mitochondria. The plant absorbs oxygen through the stomata and the root hairs. This oxygen reaches the mitochondria, where it is used to get energy from carbohydrates. CO 2 and water are released. Oxygen Carbohydrates Energy Carbon dioxide Water UNIT 2 Plant nutrition processes Go back to the Start menu Natural Science 2. Secondary Education

7 3. Substance distribution Substances in the plant are transported through tube-shaped vessels which run along the stem, the branches and the leaf veins. Some vessels take the xylem sap from the roots to the green parts of the plant. Others distribute the phloem sap throughout the plant. Xylem sap Phloem sap UNIT 2 Plant nutrition processes Go back to the Start menu Natural Science 2. Secondary Education

8 4. Eliminating waste matter Plants eliminate waste in various ways: The oxygen from photosynthesis, the carbon dioxide from respiration and excess water are eliminated through the stomata. Plants store waste in the cells of old leaves and then they eliminate them. They can also release substances like latex and resin through cuts in the stem. Oxygen Carbon dioxide Stomata Water Old leavesCut UNIT 2 Plant nutrition processes Go back to the Start menu Natural Science 2. Secondary Education


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