In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the
A) stomata.
B) thylakoid.
C) matrix.
D) stroma.
The correct answer and explanation is :
The correct answer is D) stroma.
Explanation:
In chloroplasts, the process of photosynthesis takes place, converting light energy into chemical energy in the form of sugars. The chloroplasts have two main parts: the thylakoid membranes and the stroma.
The stroma is the thick fluid found inside the chloroplast, surrounding the thylakoids. This area is critical for the Calvin cycle (also known as the light-independent reactions), which is where sugars are synthesized. The stroma contains enzymes, DNA, ribosomes, and other molecules essential for this process. During photosynthesis, carbon dioxide (CO2) is fixed in the stroma, and the energy captured by chlorophyll in the thylakoid membranes is used to produce glucose and other sugars through a series of chemical reactions.
The thylakoids are membrane-bound structures within the chloroplast that house the light-dependent reactions of photosynthesis. These reactions convert solar energy into ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are then used in the stroma to help drive the production of sugars. The matrix refers to the inner space of the mitochondria, not the chloroplasts, so it is not the correct answer in this context. Similarly, stomata are tiny pores on the surface of leaves that allow gases like CO2 and oxygen to pass in and out, but they are not involved in the production of sugars inside the chloroplast.
Thus, the stroma is the correct compartment where sugars are synthesized in chloroplasts. It is in this fluid-filled space that the Calvin cycle occurs, where the ATP and NADPH produced in the thylakoid membranes are used to convert CO2 into glucose, which the plant can store or use for energy. This process is vital for the plant’s survival and growth.