explain each of the following :
A) diffusion happens faster when the tempreature rises .
B)oxygen diffuses out of a plant leaf during daylight hours .
C)water molecules can pass through visking tubing but starch molcules cannot
D)an animal cell brusts if placed in pure water .
E)if a plant is short of water its leaves lose their firemness and the plant wilts
Answers
Answer:
Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion.Therefore, net gaseous exchange during day time is, oxygen diffuses out and carbon dioxide diffuses in. During night time no photosynthesis occurs in the leaves. Therefore, in the process of respiration oxygen diffuses into leaves from the air and carbon dioxide diffuses out in the air.When we put animal cells into pure, fresh water (H2O) , water enters the cells as a result of osmosis, and making the cell expand. ... Since animal cells do not have a cell wall, when too much of this water enters to make the concentration of water on both sides even, the animal cell may eventually burst, and die out.This continual flow of water and nutrients keeps the plant's cells firm, if the cells become short of water they lose firmness and the plant starts to wilt. We can demonstrate transpiration by placing white flowers in coloured water, the water travels up the stem to the petals which become coloured like the water.
Answer:
A) diffusion happens faster when the tempreature rises .
Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion.
B)oxygen diffuses out of a plant leaf during daylight hours .
Because of this, net gaseous exchange in the leaves of a plant is: During day time, oxygen is produced in the leaves. This is because photosynthesis occurs during the day. So leaves use some of this oxygen for respiration and rest of it is diffused out in the air.
C)water molecules can pass through visking tubing but starch molcules cannot .
Visking tubing is an artificial partially permeable membrane : smaller molecules like water and glucose pass through its microscopic holes. larger molecules like starch and sucrose cannot pass through .
D)an animal cell brusts if placed in pure water .
Tapwater and pure water are hypotonic. A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst. Plant cells have a cell wall around the outside than stops them from bursting, so a plant cell will swell up in a hypotonic solution, but will not burst .
E)if a plant is short of water its leaves lose their firemness and the plant wilts .
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Explanation: