Which is the place where there is no sunlight?
Any were away from the sun or is an enclosed area. Like a cave or a house etc.
Sometimes people talk about a place in the sun, which is a place where they can enjoy the sunlight, as opposed to a dark and gloomy cave or other unpleasant place where there is a lack of sunlight. Metaphorically it refers to a good standard of living and a good social status. I need my place in the sun.
Because in a shaded area there is of coarse less sunlight so they leaves have to adapt and grow larger so it is easier for sunlight to hit them. Where as in a brighter are the leaves don't have to be so big because there is lots (even excess) sunlight for the leaves to pick up. Additional: leaves need sunlight for the photosynthesis process where they turn sunlight into energy (food for them).