21. Leaf Structural adaptations to Function 7.2 pg 133 Leaf Structure to function Xylem transports water; phloem transports sugar Veins with xylem & phloem Rapid diffusion of gases Many intercellular air spaces More sunlight reaches top half of leaf More chloroplasts in upper palisade tissue Absorbs, converts light chemical energy stored in glucose chloroplasts Gaseous exchange Stomata Reduce water loss due to evaporation Waxy cuticle Max absorption & penetration of light to reach mesophyll Max diffusion for CO2 Thin lamina Position leaf for max light absorption Petiole (leaf stalk) Function Structure
37. 0 B ▲ Fig 1 Effect of increasing light intensity on the rate of photosynthesis at 0.03% CO2 at 20°C From A to B, even though light intensity increases, rate of photosynthesis remains constant. Light intensity is no longer a limiting factor. From 0 to A, as light intensity increases, rate of photosynthesis increases. Light intensity is a limiting factor during this stage A
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42. If there is not enough chairs , time taken will be longer.
43. If there are many chairs – time taken would still be the same as in the case of having 5 chairs only.
44. 0 B ▲ Fig 1 Effect of increasing light intensity on the rate of photosynthesis at 0.03% CO2 at 20°C From A to B, even though light intensity increases, rate of photosynthesis remains constant. Light intensity is no longer a limiting factor. From 0 to A, as light intensity increases, rate of photosynthesis increases. Light intensity is a limiting factor during this stage A Light intensity as a limiting factor
45. Effect of increasing temperature on the rate of photosynthesis Increasing light intensity (photons/m/s) Rate of photosynthesis (bubbles/min) Temperature as a limiting factor F E