Final answer:
The false statement is that 'A stroma contains a thylakoid.' The stroma is the fluid surrounding the thylakoid membranes in a chloroplast, while thylakoids are stacked into grana and contain chlorophyll for photosynthesis.
Step-by-step explanation:
A stroma contains a thylakoid. This statement is indeed false. To clarify, a chloroplast is an organelle found in plant and algal cells, which consists of the thylakoid membranes surrounded by a fluid called the stroma. Thylakoid membranes are where the light reactions of photosynthesis take place and contain chlorophyll, the green pigment vital for this process. The stroma, on the other hand, is the space outside the thylakoid membranes and is where the Calvin cycle takes place. Thylakoids are often organized into stacks called grana (singular, granum), and these stacks are surrounded by the stroma, not contained within it. Therefore, it is more accurate to state that a granum contains several thylakoids rather than a stroma contains a thylakoid.