Question

From the following which organelle containing chlorophyll is?
A. Chloroplast
B. Endoplasmic reticulum
C. Nucleus
D. Mitochondria

Answer 1

Hint: Chlorophyll is a green-colored pigment that is found in green plants and some algae. This is a photosynthetic pigment. Many types of chlorophyll molecules are found that are Chl. A, Chl. B, Chl. C, and Chl. D. Chl. A is a main photosynthetic pigment. Chemically chlorophyll is an organic compound in which 4 pyrrole rings are found that are joined and form large porphyrin rings. In the middle of this ring, Mg-ion is found. A side chain is also attached to the ring that is called phytol.

Complete step by step answer: Chl. pigment is a universal pigment as it is found in the plant kingdom. Also, it is found in some photosynthetic bacteria. The structure of chlorophyll was first of all studied by Stahl and Fischer. In green plants chl. Is found in a membranous cell organelle that is the chloroplast. This is a double membranous organelle. This is a large structure having a size of 5-7 micrometer diameter and 1 micrometer thick. Inside the chloroplast, in the matrix, a dense protein substance is found that is called the stroma. The membrane system is also found in the chloroplast. There are two types of structures that are lamellae and grana. Granum is made by the arrangement of thylakoids like a stack of coins on each other. Thylakoids are disk-like structures made by membranes. Lumens of thylakoids are in contact with each other. Thylakoids are granular structures. Quantasome particles are found on these. Chl. Molecules are found in these particles. This is the unit where the light reaction of photosynthesis takes place in which solar energy is trapped.
Hence, the correct answer is Option A

Note: Chloroplast is a semiautonomous structure because it has its own DNA that is circular and can replicate itself. It completes all processes like translation and transcription. But some enzymes depend on nuclear DNA. Chl. Is also found in purple sulphur bacteria but not chloroplast is found in them. In bacteria, chromatophores are found.