Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Raywin:
--- Quote from: ~VIN1094~ on June 07, 2010, 12:19:54 pm ---Hmm... I think I've solved this one somewhere.. which year?
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I did it long time ago, but I havent found it yet, i forgot the paper :/ but ill check which one it is and get back yeah.. :)
Airhead:
--- Quote from: aangel42 on June 07, 2010, 12:28:24 pm ---How do you guys copy a question onto this forum using .png or whatever? idk how to.. lol
Well, anyway, can someone help me out with M/J 2007 Q18?
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I think it's D. If humidity is low, the plant loses water. And if the light intensity is also low, the plant can't photosynthesize.
Vin:
easy, its C ofc. Temperature (by light intensity) increases, transpiration rate increases. Humidity low (less water mol. in amt. so water diffuses out)
Raywin:
--- Quote from: aangel42 on June 07, 2010, 12:34:24 pm ---It's not, it's C. idk why, I picked D too.
And this is all the examiner report says: "This proved to be one of the more difficult questions on the paper, though it was noticeable that it was the able candidates who reasoned their ways to the correct response. Evident errors were shown by over a third of the candidates who thought that high humidity would cause wilting, and by well over half of them that thought low light intensity might be responsible for the condition."
Anyone solved this before and know why it's C? Thanks :)
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See, humidity means a lot of water vapor is in the air around the plant. So, this reduces transpiration see? so thus, it will NOT wilt as transpiration is reduce. High light intensity will INCREASE transpiration. This could cause wilting as the plant might not be able to get as much water that is being lost to transpiration. Thus, the ans is C.
Raywin:
--- Quote from: aangel42 on June 07, 2010, 12:44:15 pm ---Thank you to Raywin and Vin for taking the time to answer.
But yeah if humidity is reduced, transpiration is increased, I got that.
BUT if light intensity is LOW, doesn't that mean the plant won't be able to photosynthesize, which means it will wilt? Which means D could be right too?
OR ohhhh wait, low light intensity = low sunlight = low photosynthesis = plant turns YELLOW, it doesn't necessarily have to wilt, right?
So does that mean that ONLY a decrease in water causes wilting?
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YES, photosynthesis will not make the plant wilt, its the water that flows through the stems that decide if the plant is wilting or not. :)
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