Question

Chloroplast stroma contains
A. Chlorophyll
B. Light dependent reaction enzymes
C. Light independent reaction enzymes
D. Ribosomes

Answer 1

Hint:- Chloroplasts are double membrane bound organelles present in eukaryotic cells of plants. It helps in absorption of sunlight and utilising it to produce food with the help of water and carbon dioxide. This process is called photosynthesis.

Complete step-by-step solution:-As we know plants produce their own food through the process of photosynthesis. During photosynthesis, plants take up the water and carbon dioxide from the atmosphere through leaves and produce carbohydrates. Photosynthesis occurs in green parts of the plant where chloroplast is present. It has two steps of phases i.e. light reaction (light dependent) and carbon fixing reaction (light independent). For the light reaction, sunlight is directly absorbed and is an essential requirement to complete the reaction, while the light independent reaction depends upon the products produced from the light dependent reaction.
Enzymes are required to catalyse the light dependent reaction, which is present in the grana of the chloroplast. Grana are the piles of thylakoids. ATP and NADPH are formed by this reaction, which are used later in the light independent reaction. Similar to the light dependent reaction, light independent reaction (also called dark reaction) also requires enzymes to catalyse it. These enzymes are found in the stroma of the chloroplast. Thus the correct option is (C) Light independent reaction enzymes.

Note:-
Chlorophyll is the pigment present in the chloroplast that provides green colour. The pigment chlorophyll is present in the thylakoids.
The enzymes for light dependent reaction are present in the grana (thylakoids).
Ribosomes are structures present in association with chloroplasts and some other organelles as well. Their main function is to synthesise proteins.