Nutrition in Plants. Notes reorganized from LPK TB

1. Nutrition in plants (I) Chapter 7

8. Overall Equation for Photosynthesis 7.1 pg 120 Equation glucose Chlorophyll Word equation: Chemical equation:

9. Fate of glucose formed 7.1 pg 125-126 Fate of glucose Glucose Sucrose Energy Used Used Used Stored Starch Fats a.a Proteins Cellulose cell wall

12. Leaf Structure & Function 7.2 pg 128 Leaf Structure & function

14. External Structure of Leaf

15. Internal Structure of Leaf

16. Internal Structure of Leaf Mesophyll Palisade mesophyll Spongy mesophyll

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

27. Nutrition in plants (II) Chapter 7

29. Recap How do CO 2 & H 2 O enter the plant? pg132

30. Pathway of CO2 from atmosphere through Stomata to rest of the plant.

35. Suggested Table 3.6 18.0 16 18 20 100 5 7.9 39.3 39 39 40 75 4 12.1 60.3 63 58 60 50 3 16.9 84.7 85 89 80 25 2 20.9 104.3 110 103 100 10 1 Rate of bubbles/min Aver-age 3 rd reading 2 nd reading 1st reading Distance of light source from plant (cm) Set up

36. As distance increases, light intensity decreases.

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

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

47. Carbon dioxide concentration as a limiting factor D C