Chlorophyll molecules are the most abundant pigments in plants that are responsi

Question

Chlorophyll molecules are the most abundant pigments in plants that are responsible for collecting light for photosynthesis. Which of the following statements is not true?

1) The two main forms of chlorophyll are chlorophyll a and b.
2) These molecules resemble the protoporphyrins in hemoglobin and myoglobin, except these contain Fe+2 rather than Mg+2.
3) They require the presence of accessory pigments such as beta-carotene and lutein in order to function.
4) They absorb light in the blue and red region of the visible spectrum, which is why they appear green.

a) Statements 1, 2, and 4 are true

b) Statements 2, 3, and 4 are true.

c) Statements 1, 2, and 3 are true.

d) All of the listed statements are true.

Explanation / Answer

Answer is option (b)

Only statement one is correct. There are various types of chlorophyll structures, but plants contain chlorophyll a and b. T

All other three statements are not true.

Green light is not absorbed but reflected, making the plant appear green.

Chlorophyll has magnesium as its central metal ion, and the large organic molecule to which it bonds is known as a porphyrin. The porphyrin contains four nitrogen atoms bonded to the magnesium ion in a square planar arrangement. Chlorophyll occurs in a variety of forms.

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