A plant develops one branch with leaves that are only palegreen or white compared to dark green leaves on other branches.Both type of branches produce flowers that can produce seeds. Suggesst any 3 explanations & experiments to confirm or exclude them.
Hello Arya!
The pigment that gives green color to the leaves is chorophyll. There are different types of chlorophyll among which chlorophyll A and Chlorophyll B are the most important ones. Cholorophyll A absorbs radiations from sun in the shorter wavelength region-blue and violet whereas cholorophyll absorbs in red and blue region, giving it more darker green color than the other.
The possible explanation why some leaves are darker than other branch leaves is:
The leaves that are darker must have more chlorophyll B pigments than the lighter green leaves branch . This is to adapt to varying amount of sunlight availability. The darker leaves must be shady region while the lighter leaves are exposed to more sunlight.
One experiment that can be done is:
Take 2 similar green plants. Place one of them in shade and the other in sunlight. Let them grow in the respective environments some days. You can notice later that the plant in shade has darker leaves than the other. Take out leaves of both the plants and test for chlorophyll A and B using spectrometry technique. The results show that there is more content of chlorophyll B in darker leaves.
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