Question

Stroma is the chloroplast of higher plants contain
A. Photosynthetic enzymes
B. Ribosomes
C. Both A and B
D. Chlorophyll

Answer 1

Hint: Stroma is the part of subcellular organelle called a chloroplast. Chloroplast performs photosynthesis, which is the energy harvesting process that occurs in plants and some photosynthetic microbes, like cyanobacteria or blue-green algae.

Complete answer: Chloroplast is a green colour plastid, in which two different kinds of reactions take place in a different part of the cell, that named as the light reaction and dark reaction. Chloroplast consists of thylakoid, stroma, nucleoid and starch granule. Thylakoid is the part where the light-dependent reaction takes place and in stroma light-independent reaction takes place. In light-dependent reaction, the assimilatory product (ATP and NADPH) are formed in grana of thylakoids of a chloroplast, while in dark reaction energy is release form ATP (from during light reaction) derive the fixing of carbon from carbon dioxide molecule. In the stroma of chloroplast light-independent reaction enzymes are present for photosynthesis. As chloroplast is the organelle, which shows the endosymbiotic system and possesses its own genomic DNA which is used to make other protein molecules and use DNA for their replication to maintain the number of the chloroplast. So ribosomes are present in the chloroplast which is necessary for organelle use during protein formation. Chloroplast ribosomes are different from plant cell ribosomes. Chlorophyll is the green colour pigment found in the chloroplast, which is responsible for green colour and traping the radiant energy.
Hence, the correct option is A.

Note: Chlorophyll is the photosynthetic pigment that is an inorganic molecule that possesses magnesium ligand in its structure. Chlorophyll not only in chloroplast but also found in some primitive type organism like mesosomes of cyanobacteria. Several variants of chlorophyll are found that name chlorophyll a, b and c.