Grana are

Which of the following molecules gets excited during photosynthesis?

Chlorophyll $a$ is the primary pigment for the light reaction. What are accessory pigments? What is their role in photosynthesis?

Chlorophyll converts

Provide the full forms of the following abbreviations:
$(1)$ $LHC$
$(2)$ $PS$

Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue regions of the spectrum of light?