1. PLANT NUTRITION 1. How Plants make their own food 2. How plants get nutrients 3. Photosyntesis 4. The distribution of elaborated sap 5. Plant respiration 6. Growth, movement and the perception of time.

2. 1. How plants make their own food Plants and animals are all living things, butthey obtain food in different ways. Animals eat other living things, but plantsmake their own food. 3. 1. How plants make their own food. Plants need air, water and mineral salt tomake their food. 4. 1. How plants make their own food. They use sunlight as their source of energy. This process is called photosynthesis. 5. 1. How plants make their own food. All plants are Autotrophs. Autotrophs areorganisms that make their own food. 6. 2. How plants get nutrients. Water and mineral salts are very important forplant nutrition. Mineral salts from the soil dissolve in water. Plants absorb water from the soil trough theirtiny root hairs. 7. 2. How plants get nutrients. The mixture of water andmineral salts, called RawSap, travels up the stemto the leaves through longtubes, called XylemVessels. Carbon dioxide enters aplant throught tiny porescalled Stomata, situatedon the underside of theplants leaves.CLICK THE ARROW 8. 3. Photosynthesis. 9. 3. Photosynthesis. Photosynthesis is a complex chemical process. It enables plants to manufacture food fromwater, mineral salts, carbon dioxide andsunlight. 10. 3. Photosynthesis. Chlorophyll is a greensubstance which trapssunlight. It is found in specialorganelles calledchloroplasts which areinside plant cells. Cholorophyll givesplants their greencolour. 11. 3. Photosynthesis. Sunlight is essential forphotosynthesis, so theprocess can only take placeduring the day. In the leaves, the raw sapmixes with carbon dioxideand becomes elaboratedsap: the plants food. Plants release oxygen as awaste product ofphotosynthesis. 12. 3. Photosynthesis. 13. 3. Photosynthesis. 14. 4. The distribution of elaborated sap. Elaborated sap is made whenraw sap mixes with carbondioxide. This food is distributed fromthe leaves to all parts of theplant through tubes calledPhloem vessels. This distribution is veryimportant becausephotosynthesis does not takeplace in all parts of the plant. Phloem vessels are separatedfrom xylem vessels, so thatraw sap elaborated sap do notmix. 15. 4. The distribution of elaborated sap. 16. 5. Plant Respiration. Plants need to breathe. Theytake in oxygen from the airand give off carbon dioxide. Plants combine oxygen withnutrients to obtain energy.This gas exchange is calledRespiration. During photosynthesis, theopposite ocurs. Plants take incarbon dioxide and give offoxigen. However, plants produce moreoxygen than they can use. As aresult, forests are animportant source of oxygen. 17. 5. Plant Respiration. 18. 6. Growth, movement and the perception of time. All plants have sensitivity: they react tochanges in the enviroment. 19. 6. Growth, movement and theperception of time. Roots always grow downwards, andstems always grow upwards, even if theground is sloping. Stems and leaves grow towards light. Vines, such as grapevines, wrapthemselves round a support and growalong it. The mimosa plant is capable of rapidmovement: Its leaves close if you touchit. Plants can distinguis the seasons by thenumber of hours of daylight anddarkness. Days get longer and nights getshorter in spring when plants normallygrow flowers. 20. 6. Growth, movement and theperception of time. 21. ANY QUESTIONS???FINALLY,WE ARE GOINGTO SEE AVIDEO ABOUTPHOTOSYNTHESIS CLICK THE ARROW