Nutrition in plants

Name: __________________ Topic: Nutrition in plants Concepts Summary Notes Nan Hua High School Biology 1 LO: Identify and label the cellular and tissue structure of a dicotyledonous leaf, as seen in transverse section using the light microscope and describe the significance of these features in terms of their functions, such as the • distribution of chloroplasts in photosynthesis • stomata and mesophyll cells in gaseous exchange • vascular bundles in transport Internal leaf Structure

Name: __________________ Topic: Nutrition in plants Concepts Summary Notes Nan Hua High School Biology 2 Structure Function Upper epidermis ● Contains cuticle (waxy layer that reduces excessive evaporation of water) ● Single, protective layer of cells ● Transparent to allow light to pass through to reach the mesophyll cells ● No chloroplasts Palisade Mesophyll cells ● Closely packed, large number of chloroplasts to absorb maximum light energy for photosynthesis. Spongy Mesophyll cells ● Lesser chloroplasts for photosynthesis ● Loosely packed with intercellular air spaces to facilitate diffusion of carbon dioxide and water vapour ● Surface covered with layer of moisture to allow carbon dioxide to dissolve first before diffusing into cells Vascular bundles (xylem + phloem) Xylem ● Transports water and minerals salts from roots to leaves ● Strengthens leaf to prevent tearing Phloem ● Transports sucrose and amino acids from leaves to other parts of plant (Translocation) Lower epidermis ● Single, protective layer of cells ● Presence of stomata for gaseous exchange Guard Cells ● Regulate the opening and closing of the stomata ● Contain chloroplasts for photosynthesis

Name: __________________ Topic: Nutrition in plants Concepts Summary Notes Nan Hua High School Biology 3 LO: State the equation, in words and symbols, for photosynthesis Word Equation: carbon dioxide + water glucose + oxygen Chemical Equation: 6CO2 + 6H2O C6H12O6 + 6O2 • Rate of respiration in plants is taken to be constant. • When rate of photosynthesis is higher than rate of respiration, net carbon dioxide is taken in. • When rate of photosynthesis is lower than rate of respiration, net carbon dioxide is given out. light energy → chlorophyll light energy → chlorophyll

Name: __________________