With regard to the experiment involving leaf extracts, (a) Name the 4 pigments i

Question

With regard to the experiment involving leaf extracts, (a) Name the 4 pigments in the leaf extract iv What are the factors that determine the rate of movement of the different pigments. (b) (c) Which of the 2 chlorophyll forms is more soluble in the solvent and what evidence supports your answer? (d) What is the function of the leaf pigments in photosymthesis? (e) Explain why leaves change color in the Fall. and the significance of the absorbance level between wavelengths of 500 600 nm. 4. In the Absorption Spectra of chlorophyll A and B depicted below, explain 700 400 500

Explanation / Answer

Four pigments in leaf extract are

Chlorophyll a

Chlorophyll b

Carotenoid

Xanthophyll

Rate of movement is determined by

1. Solubility of pigment in solvent

2. Molecular weight of and size of pigment

Xanthophyll and chlorophyll A are most soluble and they travel max distance on chromatography paper.

Pigments absorb sunlight to initiate the process of photosynthesis.

Leaf color change is due to interconversion of pigments and plastids from chloroplast to chromoplast.

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