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12.2 Leaves Pages 546-551. Tea leaves Camellia sinsensis.

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Presentation on theme: "12.2 Leaves Pages 546-551. Tea leaves Camellia sinsensis."— Presentation transcript:

1 12.2 Leaves Pages 546-551

2 Tea leaves Camellia sinsensis

3 Leaves Site of : Photosynthesis Gas exchange Storage Protection from predators

4 Photosynthesis Glucose is used for fuelling cellular processes and as a building block for structural materials (cellulose)

5 Photosynthesis Oxygen is produced, required by all organisms for cellular respiration

6 Photosynthesis Carbon dioxide is a greenhouse gas, so photosynthesis reduces carbon dioxide in the atmosphere

7 chloroplasts Organelles in plants, site of photosynthesis

8 Photopigments Pigments absorb certain wavelengths of light and reflect others Chlorophyll absorbs red and blue light and reflects green light

9 Accessory pigments Accessory pigments absorb different colours of light

10 Protection Shape. For example: sharp spines in cacti Surface hairs. Toxins or bad-tasting chemicals to deter herbivores

11 Structure of Leaves Blade…flat part of the leaf Petiole…stalk-like structure attaches leaf to stem Simple leaf or compound leaf

12 Veins Venation is the pattern of veins Parallel veins are seen in monocots Branching veins are seen in eudicots

13 Internal Leaf Structure

14 Layers Waxy cuticle- prevents water loss -acts as a barrier for bacteria, mould and insects

15 Epidermis Transparent cells Single layer of cells No photosynthesis

16 Mesophyll Chloroplasts are found in mesophyll cells Palisade…elongated, tightly packed, contain many chloroplasts Spongy…loosely packed, large air spaces

17 Stoma (or stomata) Tiny pores through which gases move Guard cells control the opening and closing of the stomata

18 Specialized Leaves Storage of water and carbohydrates. example: onions

19 Storing water for example: aloe vera

20 Protection CactiTobacco

21 Protection against freezing Conifers have needle-shaped leaves that shed easily, have thick waxy cuticles, sunken stomata, and may contain antifreeze chemicals.

22 Human uses for leaves Teas Herbs and spices Food wraps (cabbage, grape, banana or bamboo leaves)

23 Dark leafy greens Contain Ca, Mg, K and Fe Vitamins B, C, E, and K Beta-carotene, omega-3 fats etc.

24 Other uses for leaves Waxes Religious ceremonies Construction materials

25 Drugs Digitalis is used to treat heart disease

26 Vincristine and vinblastine Treats childhood leukemia and Hodgkin’s disease.

27 Psychotropic Drugs Alter perception, emotion or behaviour THC tetrahydrocannabinol Coca …cocaine

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