Created by Ms Poh ZX GAME (5 min). Created by Ms Poh ZX Visit the following site: esactivities/plantsgrow.html

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Presentation transcript:

Created by Ms Poh ZX GAME (5 min)

Created by Ms Poh ZX Visit the following site: esactivities/plantsgrow.html esactivities/plantsgrow.html Be the first to grow a healthy plant!

Created by Ms Poh ZX Photosynthesis Carbon dioxide Water Oxygen Glucose (main product) Sunlight Water

Created by Ms Poh ZX Carbon dioxide + water Oxygen + glucose + water Sunlight Chlorophyll Raw materials Word Equation 6CO H 2 O 6O 2 + C 6 H 12 O 6 + 6H 2 O Sunlight Chlorophyll Raw materials Chemical Equation Photosynthesis Temperature

Created by Ms Poh ZX Photosynthesis is the process in which light energy absorbed by chlorophyll is transformed into chemical energy. The chemical energy is used to synthesise carbohydrates from water and carbon dioxide. Water and carbon dioxide are the raw materials for photosynthesis. Oxygen is released during the process.

Created by Ms Poh ZX Where does photosynthesis occur? In the chloroplast! Adapted from Detailed explanation:

Created by Ms Poh ZX Nutrition in Plants Objectives Identify carbon dioxide and water as raw materials that are necessary for photosynthesis. Represent the equation for photosynthesis in word and symbol form. State that photosynthesis takes place in chloroplast.

Created by Ms Poh ZX Nutrition in Plants Objectives Label the cross section of a dicotyledonous leaf. Describe the distribution of chloroplasts in the leaf Relate the distribution of chloroplasts to photosynthesis. Differentiate stomata and guard cells. Describe the distribution of stomata.

Created by Ms Poh ZX ACTIVITY (5 min)

Created by Ms Poh ZX External features of leaf that I have identified

Created by Ms Poh ZX Stem Petiole/ leaf stalk Lamina/ leaf blade Network of veins Adapted from Main Vein (mid-rib) External features of dicotyledonous leaf

Created by Ms Poh ZX External Feature Characteristics of feature Function Lamina (plural: laminae) Large flat surface as compared to volume To obtain maximum amount of sunlight for photosynthesis Large, thin lamina1)To allow carbon dioxide to reach inner leaf cells rapidly 2)To enable sunlight to reach all mesophyll cells PetioleHolds lamina away from stem To allow lamina obtain sufficient sunlight and air Note: Some leaves are without petiole. They have long laminae. VeinsContains xylem and phloem Xylem: To transport water and mineral salts Phloem: To transport food

Created by Ms Poh ZX Internal structures of dicotyledonous leaf Xylem Phloem

Created by Ms Poh ZX Internal structures of dicotyledonous leaf Click:

Created by Ms Poh ZX Vacuole Chloroplast Nucleus Only the mesophyll cells and guard cells have chloroplast. Main site of photosynthesis

Created by Ms Poh ZX Chloroplast Cell Wall (thicker near stoma) Stoma

Created by Ms Poh ZX Internal Structure Characteristics of structure Account for the structure CuticleTransparent Waxy Upper epidermis Absence of chloroplast Presence of stomata Palisade mesophyll layer Closely packed, long and cylindrical cells Right angle to epidermis Contains chloroplast Covered with thin film of water Cuticle Upper epidermis Palisade mesophyll

Created by Ms Poh ZX Cuticle Lower epidermis Spongy mesophyll Internal Structure Characteristics of structureAccount for the structure Spongy mesophyll layer Irregular shape cells with lots of intercellular air spaces Covered with thin film of water Contains fewer chloroplast then palisade layer Contains vascular tissues Lower epidermis Does not contain chloroplast More stomata than upper epidermis CuticleRefer to previous slide