Question

11. Observe the figure and answer the following questions:
(a) In the figure mark granum, thylakoid and stroma.
(b) Which type of plastid is responsible for the colour of apple fruit?
(c) Is this structure found in animals? What is the function of this cell organelle?
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(d) Which cell organelle is said to be the largest in the cell?
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Answer 1

ANSWER

Grana and stroma are two structures of the chloroplast. Grana is the disk-like plates embedded in the stroma whereas stroma is the jelly-like colorless matrix of the chloroplast. A thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria. The space between thylakoid membrane is called thylakoid lumen. They are the site of light-dependent reactions of photosynthesis. Grana are connected by integral or stroma thylakoids, which joins the stacks together to make a single functional compartment.

Stromal thylakoids are also called as integral thylakoids.

So, the corect answer is " stromal thylakoid, grana thylakoid ".

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