# Changes on cells. - (Nov/12/2006 )

1. If chlorophyll does not take in green, can it use the energy of green light for photosynthesis? I know that green color absorbs other colors, but I don't understand the question. Does it mean' what color should the chlorophyll be if it is not green'?
2. Why does foliage turn red and yellow in the autumn?
3. Cells that carry on photosynthesis are held aloft in the air, so they obtain light and air. What does it mean that 'cells .... are held in the air'? makes no any sense?
4. My teacher told us the photosynthetic equation is:
sun +H2O+chlorophyll+CO2--->C6H12O6+O2+H2O ; but on my book, it says: energy+CO2+H2O--->C6H12O2+O2 why there is no 'chlorophyll' at the left side, and no H2O at the right side compared to my teacher's?
THanks for replies!

-MIA6-

Hope this link would help to solve your problem.

-K.B.-

QUOTE (MIA6 @ Nov 12 2006, 11:35 AM)
1. If chlorophyll does not take in green, can it use the energy of green light for photosynthesis? I know that green color absorbs other colors, but I don't understand the question. Does it mean' what color should the chlorophyll be if it is not green'?
2. Why does foliage turn red and yellow in the autumn?
3. Cells that carry on photosynthesis are held aloft in the air, so they obtain light and air. What does it mean that 'cells .... are held in the air'? makes no any sense?
4. My teacher told us the photosynthetic equation is:
sun +H2O+chlorophyll+CO2--->C6H12O6+O2+H2O ; but on my book, it says: energy+CO2+H2O--->C6H12O2+O2 why there is no 'chlorophyll' at the left side, and no H2O at the right side compared to my teacher's?
THanks for replies!

1) Chlorophyll present in leaves, absorbs Sun's energy in form of packages and this energy is carried (held) by biomolecules like NADPH and ATP which during the 'dark cycle' or Calvin's cycle converts carbon dioxide in a chemical reaction with water and converts it into energy-rich compound called Glucose - C6H12O6. The energy from ATP/NADPH is transferred to the sugar molecule - glucose - C6H12O6.
Some plants may have variegated leaves where there is little or no green pigment at all but red / purple. In such cases I assume, these pigments absorb Sun's energy at different level and carry on the food preparation.
2) I have vague answer but not clearly scientific - so maybe someone else can answer.
3) I don't know clearly but could be that more photosynthetically active cells are more towards the side of the leaf that face the Sun than towards the bottom of the leaf.
4) no comments!

-padma_dp-

First of all: any plant physiology text, indeed any high school science book, will tell you all the answers to these questions.
This link is a good place to start.

Green is reflected, blue light is main energy source for photosynthesis (think about energy of the colours)

Wastes and non-translocatable cmpds left in leaves. Give names for a good answer

cells are in the leaves, leaves are in the air, therefore cells are in the air

6CO2 +6H2O ---> C6H12O6 + 6O2... basic chemistry.

-bob1-

for 4 : chlorophylle is the enzyme and energy is cofactor

-fred_33-

1) red to near ir is the stimulating color for chlorophyll

2) chlorophyll breaks down leaving other pigments to dominate

4) (as fred said) the book gave the balanced equation with only the reactants and products, chlorophyll and light are the catalyst and energy source, and water is not a product of the reaction.

-mdfenko-