PLANT NUTRITION How do plants eat?.

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Presentation transcript:

PLANT NUTRITION How do plants eat?

Some basic plant functions: Make food using raw material raw material: carbon dioxide, sunlight, nutrients in soil Takes in water through roots The water leaves through the leaves

What plants need to eat Water Carbon dioxide Microorganisms help reactant in photosynthesis Carbon dioxide Microorganisms help they fix essential elements in the soil Sunlight provides energy for photosynthesis

Photosynthesis “photo” means light synthesis: putting something together use light –from the sun– to convert carbon dioxide and water into oxygen and carbohydrates http://telstar.ote.cmu.edu/environ/m3/s4/cycleCarbon.shtml

How do the reactants get in the plant? Stoma (plural: stomata): tiny openings in leaves that lets raw materials in open during the day closed at night more than 90% of water taken in is lost through stomata every day. http://fig.cox.miami.edu/~tkoop/spring00/stomata.jpg

Chlorophyll: solar cells chlorophyll pigments in chloroplasts: absorbs light energy cause for green coloration of plants Chloroplasts in spinach leaf http://www.gettysburg.edu/~rcavalie/em/tem_pics.html General structure of chloroplast http://www.stemnet.nf.ca/~dpower/cell/chloro2.jpg

What happens next? Water: absorbed through roots, travels to leaves Carbon dioxide: absorbed through stomata Light energy: absorbed by chlorophll Water & carbon dioxide move to chloroplasts where the reaction takes place.

What happens to the products of photosynthesis? Carbohydrates: broken down inside plant to provide energy to carry out plant functions. stored in cells for later use Oxygen: released through stomata into atmosphere

Photosynthesis as a process http://www.cyber-sisters.org/images/photosynthesis.jpg

Microorganisms help too Microorganisms in the soil fix essential nutrients so plants can use them Without their help, nitrogen would be totally unavailable for us to use Nitrogen fact: Nitrogen makes up 78% of Earth’s atmosphere

Are plants important? Safe level of oxygen in the atmosphere for humans: 18-25% Level of oxygen in the atmosphere today: 21% All thanks to the photosynthesis