Unit 4 Homeworks

B4b H Farmer Joe is an award winning horticulturalist and he wants to increase the production of his prize winning rose collection. Explain what factors he needs to control, and how each of these will improve his yield

B4b H answer co2, light, temperature. explanation of how each these factors increase the rate of photosynthesis. Could inlcude graphs to show effect of limiting factors on rate of photosynthesis.

B4b F Farmer Joe is an award winning horticulturalist and he wants to increase the production of his prize winning rose collection. Describe what factors he needs to control, and how each of these will improve his yield

B4b F CO2 light temperature. Description of how these increase the rate

B4c H Provide pupils with a picture of cactus and water lily. Assess how the cellular structure and adaptations of each plant match it's photosynthetic function.

B4c H answer Describe how the broad leaf of the Water lily and the narrowed leaf/spines of a cactus increase rate of photosynthesis and reduce water loss. [1]Explain how the cellular structure of a leaf is adapted for photosynthesis. [1] A detailed explanation of how each part is adapted: Epidermis- Transparent- allows light to enter the leaf for the light dependent reaction palisade layer at the top containing most ofthe chloroplasts and explanation why air spaces in the spongy mesophyll allowdiffusion between stomata andphotosynthesising cells internal surface area/volume ratio verylarge. [3-4]. Out line of the importance of these parts in the two processes of photosynthesis [5/6]

B4c F Illustrate the structure of a leaf, and explain how the different parts are adapted for efficint photosynthesis.

B4c F answers Name and locate the parts of a leaf: cuticle upper and lower epidermis palisade and spongy mesophyll layers stomata and guard cells vascular bundleExplain how leaves are adapted for efficientphotosynthesis: broad so large surface area thin so short distance for gases to diffuse contain chlorophyll and other pigments toabsorb light from different parts of spectrum have a network of vascular bundles forsupport and transport guard cells which open and close the stomata

B4d H Using the terms flaccid, lysis, plasmolysed, crenation and turgid. Explain how Osmosis causes cells to change shape

B4d H answers Turgid/turgor pressure of water on inelastic cell wall. Definition of osmosis, flaccid/crenation/plasmolysis due to loss of water. lysis too much water in animal cell. mark for the keywords used correctly then 1 SPAG.

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