BIO120H1 Lecture : lecture note

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turquoisekangaroo317

10 Jan 2011

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BIO120H1 Full Course Notes

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Slide 17- a plants a relationship with animals is completely different from the relationship animals hre with plants, because plants make their own food. 18- having big thin flats is a good thing, for harvesting light and pulling out. 19- when the stomta are open, only then can plants phtosynthesize. 20- if aplant is in danger of overheating, it opens its stomata. 26- variation in leaf shape middle on has cut out from the side, and the first leaf has cuts that are deep called sines. Shedding heat to revent overheating, its so plants can get rid of extra heat. 30- laminar flow also effects animals the rabbits ears in the second picture, interrupt air flow, and so eddies is formed. 33 + 34- most common plants, doing a couple of things to prevent water loss. But does produce leave, but they are tiny ( called microphylyy). This is an example of adaptaion, so that the leaves don"t overheat.

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2. There are two types of plants, C3 and C4. C3 plants use the Calvin Cycle to generate sugar. C4 plants use phosphoenol pyruvate to make malate and oxaloacetate which will eventually be used to make sugar. Both types of plants have stomatas (openings on leaves that can be opened and closed) for CO2 entry. In addition, water is also lost through the stomata. C3 plants are only able to synthesize sugar at relatively high CO2 levels because photosynthesis will stop when CO2 production from the mitochondria equals the use of CO2 in the chloroplasts. C4 plants are able to continue photosynthesis even at low CO2 levels. (1) Why are C4 plants able to survive in hot, dry conditions when C3 plants are not? (2) Plants can develop cancer but it is usually from an infection not from the ionizing rays of the sun. What part of the photosynthesis pathway do you think protects the plant form sun damage?

Using Glucose as the carbohydrate, explain the relationship between photosynthesis and cellular respiration. How do plants use the products of photosynthesis ?

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Why is photosynthesis so crucial to life on earth?

A. Photosynthetic organisms are consumers; without them, there would be too many producers. B. Photosynthesis allows plants to survive on land; without it, life would be restricted to aqueous environments. C. Photosynthesis uses up excess sunlight; without it, the earth would overheat from too much sunlight. D. Photosynthesis creates the food humans and other animals eat and the oxygen they breathe

BIO120H1 Lecture : lecture note

BIO120H1 Full Course Notes

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