Leaves Pages 578; 595 - 597.

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Presentation transcript:

Leaves Pages 578; 595 - 597

A. Function 1. specialized organs that carry out photosynthesis  CO2 + H20 C6H12O6 + O2

B. Parts of the Leaf 2. Epidermis - single layer on 1. Cuticle - thin, waxy outer layer that prevents the loss of too much water the upper & lower surface of the leaf that functions in protection 2. Epidermis - single layer on

Parts of the Leaf 3. Mesophyll - area where there are cells with chloroplasts; area of photosynthesis 4. Vein - bundles of vascular tissues a. Xylem - transports water (food) b. Phloem - transports sugar

Parts of the Leaf 5. Stomata - tiny pores on the lower surface that allows carbon dioxide to enter and water & oxygen to exit the leaf during photosynthesis; allows oxygen to enter and water & carbon dioxide to exit the leaf during respiration

Parts of the Leaf 6. Guard Cells - opens & closes the stomata; regulates gas exchange and water loss stomata closed stomata open

* More than 90% of the water taken up by the roots are lost to the atmosphere as water vapor (through the stomata); this is called transpiration

cuticle upper epidermis lower epidermis guard cells stomata vascular tissues (xylem & phloem) mesophyll lower epidermis guard cells stomata

Leaf Adaptation: 1. Cactus: “thorns” are thin to photosynthetic reduce water loss; they are not 1. Cactus: “thorns” are thin to reduce water loss 2. Pine Needles: thin and waxy to collect sunlight (tropical) 3. Broadleaf: large, flat leaves to

Leaf Adaptation: 4. Carnivorous: a. pitcher plant: leaves are shaped enzymes contains rainwater and digestive to “funnel” insects; the “pitcher” a. pitcher plant: leaves are shaped

Pitcher Plant

Pitcher Plant

Leaf Adaptation: b. sundew: leaves have sticky digestive enzymes secretions (which trap insects) and b. sundew: leaves have sticky

sundew

Leaf Adaptation: c. Venus Flytrap: leaf blades release digestive enzymes trap the animals inside and are hinged; they fold up & and c. Venus Flytrap: leaf blades

Venus Fly Trap

Venus Fly Trap

Leaf Adaptation: 5. Chemical Defenses: chemicals insects (ex. nicotine) growth and development of 5. Chemical Defenses: chemicals on leaves that kill or disrupt the