Answer :

The light reactions of photosynthesis supply the Calvin cycle with (d) ATP and NADPH.

Light reactions are photochemical reactions which are directly driven by light. They are responsible for the synthesis of ATP as well as NADPH.

Light reactions take place in the membranous system that is present  within the chloroplasts. The membrane system consists of grana, the stromal lamellae and the matrix stroma.

The products of light reaction include ATP, NADPH as well as O₂. However, ATP as well as NADPH are used in driving the processes which result in the production of sugars, whereas O₂ diffuses out of the chloroplast.

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