Question

The green pigments present in the plants which help in the synthesis of food is
(a) Chlorophyll
(b) Keratin
(c) Serotonin
(d) Haemoglobin

Answer 1

Hint: The green pigment found in plants which helps in the synthesis of food. In green plants, it occurs in membranous disc- like units called thylakoids in organelles termed as chloroplasts.

Complete answer:
Chlorophyll is the green pigment present in the plants that give the green colour to leaves. Chlorophyll is found in practically all photosynthetic organisms, including green plants, cyanobacteria, and algae.
- Chlorophyll is the most important class of pigments involved in photosynthesis i.e. the process by which light energy is transformed into chemical energy through the synthesis of organic compounds.
- It absorbs energy from the light which is then used to convert carbon dioxide to carbohydrates.
- Chlorophyll occurs in several different forms:
Chlorophylls a and b are the major types seen in higher plants and green algae;
Chlorophylls c and d are observed, often with a, in different algae;
Chlorophyll e is a rare type seen in some golden algae, and bacterio- chlorophyll occurs in certain bacteria.
- The chlorophyll molecule contains a central magnesium atom surrounded by a nitrogen-containing structure known as a porphyrin ring. It is attached to the ring is a long carbon-hydrogen side chain, known as a phytol chain.
- Chlorophyll is unusually similar in structure to haemoglobin found in the red blood cells of vertebrates.
So the correct option is “chlorophyll”.

Note:
Keratin is fibrous structural proteins found in structural material making up hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates. Serotonin is a chemical that is found in the human body and called happy chemical because it helps to wellbeing and happiness. Haemoglobin is a protein, found in the red blood cells, that attaches to oxygen in the blood and gives its red colour.