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PHOTOSYNTHESIS & AUTUMN LEAVES

PHOTOSYNTHESIS & AUTUMN LEAVES. Middle School Science Mrs. Figoten. DO LEAVES ON TREES IN ALL BIOMES CHANGE COLOR?. Leaves change c o l o r seasonally only in deciduous forests. Warm summers & cold winters 50+ cm precipitation/yr Trees shed leaves yearly. WHY ONLY IN.

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PHOTOSYNTHESIS & AUTUMN LEAVES

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  1. PHOTOSYNTHESIS & AUTUMN LEAVES Middle School Science Mrs. Figoten

  2. DO LEAVES ON TREES IN ALL BIOMES CHANGE COLOR? Leaves change color seasonally only in deciduous forests.

  3. Warm summers & cold winters 50+ cm precipitation/yr Trees shed leaves yearly WHY ONLY IN DECIDUOUS FORESTS?

  4. AUTUMNLEAFCHANGES What signals leaves to change color in autumn? • Earth’s tilt changes in Northern Hemisphere • Less daylight,cooler temperatures

  5. AUTUMNLEAFCHANGES What causesleafcolor? • 3 pigments in each leaf- the amount in each leaf varies • Chlorophyll • Carotene • Anthocyanin

  6. LEAF PIGMENT: CHLOROPHYLL • Leaf appears green • Present in leaf membrane • Needs sunlight in order to make food for tree through photosynthesis

  7. LEAF PIGMENT: CAROTENE • Leaf appears yellow • Remains in leaf membrane as chlorophyll disappears • Helps with photosynthesis • Birch & Hickory leaves have lots of carotene

  8. LEAF PIGMENT: ANTHOCYANIN • Leaf appears red/purple • Present in cell sap • Reacts with sugar from photosynthesis • In some trees, sugar in leaves increasesin autumn • Red Maple, Red Oak & Sumac leaves have lots of anthocyanin

  9. WHAT IS PHOTOSYNTHESIS?

  10. WHAT DO PLANTS NEED FOR PHOTOSYNTHESIS?

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  12. DOES ANYTHING ELSE MAKE ITS OWN FOOD USING PHOTOSYNTHESIS?

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