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bio please help i'm stuck ?!?
hi i'm stuck and i dont know how to answer these questions:
1) what is the advantage of having more chloroplasts in the palisade layer than the spongy layer?
2)name the substance that has more energy: a) carbon dioxide ,b) glucose and oxygen
3)state one unction of water in a leaf?
4) 2 speciemen tubes were set up and left for 1 hour . the plants in both tubes have been left in the dark for 24 hours. After one hour the nail in tube A (exposed to sunlight) had begun to rust , but the nail in tube B ( it's covered with a dark cover)did not rust.
a) explain why the nail in A has rusted , but the nail in B had not rusted.
b)state why the water was boiled before being used in the tubes?
please help im so stuck
thanx
1) The leaf consists of 3 layers: epidermal layer, palisade mesophyll cells, and the spongy mesophyll cells. the epidermal cells doesn't contain any chloroplasts so that maximum sunlight can penetrate through and reach the palisade mesophyll cells. The palisade mesophyll cells are densely packed with chloroplasts and arranged vertically to maximise sunlight absorption. Sunlight that manage to pass through the palisade mesophyll cells will be trapped by the spongy mesophyll cells.
2) Glucose. Glucose is oxidised to carbon dioxide and water to release energy of 38 ATP.
3) Water undergoes photolysis in the chloroplasts of the leaf. Water is split into hydrogen ions and hydroxide ions. The chlorophyll which has been excited by the sunlight releases electrons. The hydrogen ions receives an electron to form hydrogen atom. Hydrogen atom is needed to reduce carbon dioxide into glucose.
4) This experiment is quite illogical as rusting is a slow process. nonetheless, the concept tested is when exposed to light, the guard cells of the plant open up. Thus transpiration occurs. So water evaporates out from the stomata. Therefore, the tube A is saturated with water thus causing the iron nail to rust.
Boiled water does not contain air.
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