Question

Can light reactions occur in the dark?

Answer 1

No

Explanation:

Light dependent reactions(taking place in thylakoid discs)of photosynthesis can't take place in absence of light.
The reason for this is that; during light reactions, the sunlight energy is the basic source which is absorbed by carotenoids and chlorophyll b(accessory pigments) and is converted into chemical energy`(ATP and NADPH`) by the chlorophyll a molecules in the reaction center.
Just like this:

`"Sunlight energy"` `to` `"carotenoids"` `to` `"chlorophyll b"` `to` `"chorophyll a"` `to` `"chemical energy"`

This chemical energy is then used by the dark reactions to produce sugars in the stroma of chloroplast.

Hope it helps...