Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Ivo:
--- Quote from: aangel42 on June 07, 2010, 07:19:13 pm ---Well the first is D...
And the third is B?
--- End quote ---
Why B? And the second is a bit weird.
aangel42:
--- Quote from: SNA on June 07, 2010, 07:22:44 pm ---without presence of sunlight,(usually at night) plant respire ,releasing co2.
--- End quote ---
Correction: plants always respire!!!
It involves the same equation as for humans (aerobic respiration = oxygen in, CO2 out)
Vin:
--- Quote from: Ivo on June 07, 2010, 07:21:03 pm ---Please can someone explain. I thought photosynthesis (plant nutrition) absorbs carbon dioxide and gives off oxygen. Why respiration?
--- End quote ---
Respiration uses O2 and gives off CO2, these.
ambitious94:
Heyy can anyone please help me out with June 09 Q 3)
How cum it's not B and it's D...doesnt the plant have just four stamen ..UGHHH... ???
I cant manage more than 37 :(
aangel42:
--- Quote from: Ivo on June 07, 2010, 07:24:51 pm ---Why B? And the second is a bit weird.
--- End quote ---
Yeah, exactly, I don't get the second at all, to be quite honest.
Ok, so I think it's B, because well major clue, is that heating is only occurring at A and B, so it has to be either one. When conducting a starch test, you must first boil the leaf in water to kill it (= liquid A is water) and then in alcohol, to dissolve the green chlorophyll so that the black coloring from when you put the iodine doesn't interfere and mix the colors up.
Another huge clue is the presence of the test tube, ethanol is a flammable liquid, so even if you have no idea about the starch test stages, you can just narrow it down to A and B, and guess with B since a test tube is present, so there's a higher chance that would be the answer.
Can anyone confirm this? And answer the second one?
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