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CHEM AND BIO HELP AND TIPS HERE

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8T:
Hello again.
O/n 03 Link :http://www.freeexampapers.us/IGCSE/Biology/CIE/2003%20Nov/0610_w03_qp_1.pdf
No. 15 I dont get how water diffuses?I thought water molecules move by osmosis so any help?
 Ans: B

Raywin:

--- Quote from: 8T on June 07, 2010, 03:27:03 pm ---Hello again.
O/n 03 Link :http://www.freeexampapers.us/IGCSE/Biology/CIE/2003%20Nov/0610_w03_qp_1.pdf
No. 15 I dont get how water diffuses?I thought water molecules move by osmosis so any help?
 Ans: B

--- End quote ---

Water evaporates from the mesophyll cells surfaces then diffuses, as vapor, through the intercellular spaces before leaving the leaf through the stomata during TRANSPIRATION. So basically the water first evaporates and then in those spaces u see in the diagram in tht Q well it stays there as water vapor. and when the stomata opens, these water vapors diffuse out through the open stomata.   :) hope you got me. :) so yeah the ans is B.

Vin:

--- Quote from: 8T on June 07, 2010, 03:27:03 pm ---Hello again.
O/n 03 Link :http://www.freeexampapers.us/IGCSE/Biology/CIE/2003%20Nov/0610_w03_qp_1.pdf
No. 15 I dont get how water diffuses?I thought water molecules move by osmosis so any help?
 Ans: B

--- End quote ---

Water in liq. state move by osmosis, here its evaporates from the spongy mesophyll cells. Water is in gas state (vapor) and all gases diffuse, hence diffusion

mdwael:
Hey guys please help me I want the answers for 1994-2001  paper 1 bio its there in freeexampapers but its not opening can someone just go there and download it and send it to me on email mdwael@live.com the link is

http://www.freeexampapers.us/IGCSE/Biology/CIE/1993%20-%202003/Answers%20June%201993%20--%202003%20P1,%203,%20&%206.pdf

I will never forget this favour..Its my last exam tommorow, I want it to pass in peace

Raywin:

--- Quote from: aangel42 on June 07, 2010, 03:40:00 pm ---The surface waters of the ocean contain a population of microscopic plants (plankton).
Which factor would result in fewer of these plants?

A an increase in the population of microscopic animals
B greater concentration of mineral nutrients
C more light
D warmer ocean water

What's the answer and WHY?

--- End quote ---

Lol, easy.. ;D its A as microscopic animals will eat these plants.. they get reduced in numbers. :) the other three options will only benefit the plant see? :)

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