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 3. i. tavo tine iichla iv Chllo 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 photosynthesis? (e) Explain why leaves change color in the Fal. 4 In the Absorption Spectra of chlorophy'll A and B depicted below, explain the significance of the absorbance level between wavelengths of 500 600 nm. and a. 400 500 600 700

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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