Which one of the following pigments does not occur in the chloroplast?

In the figure given below,the black line (upper) indicates the action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-$a$. Answer the following:
$(a)$ What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.
$(b)$ How can we derive an absorption spectrum for any substance?
$(c)$ If chlorophyll-$a$ is responsible for the light reaction of photosynthesis,why do the action spectrum and absorption spectrum not overlap?

What are the two peaks of light absorption of Chlorophyll $a$? The two peaks are near:

Which element is present in the center of the porphyrin ring of chlorophyll?

Which of the following are accessory pigments for photosynthesis?

In a chloroplast,chlorophyll is found in: