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chlorophyll
The mesophyll has two layers. The outermost layer is the palisade layer that is made of tightly packed chloroplasts, and the innermost layer is the "spongy layer" that has air between its cells.
Palisade
The upper leaf cells are tightly packed to trap the energy in sunlight.From: -Pearson Education,Inc.
Tightly packed cells
chlorophyll
Packing palisade cells tightly together means that the maximum amount of light can be intercepted. If there are big gaps between the cells then more of the light hitting the leaf will just pass straight through. Tightly packed palisade cells is one way in which leaves are adapted for photosynthesis.
The mesophyll has two layers. The outermost layer is the palisade layer that is made of tightly packed chloroplasts, and the innermost layer is the "spongy layer" that has air between its cells.
Palisade
The upper leaf cells are tightly packed to trap the energy in sunlight.From: -Pearson Education,Inc.
Tightly packed cells
The palisade layer of cells is tightly packed, like a brick wall, and contains the greatest concentration of chloroplasts in the leaf. The spongy mesophyll is loosely packed, containing many air spaces between the cells. The mesophyll contains vascular bundles and fewer chloroplasts than the palisade. Simply put, the palisade's main purpose is photosynthesis, and the spongy's gas exchange.
Feature
Palisade Packing palisade cells tightly together means that the maximum amount of light can be intercepted. If there are big gaps between the cells then more of the light hitting the leaf will just pass straight through. Tightly packed palisade cells is one way in which leaves are adapted for photosynthesis.
Leaves
In leaves, photosynthesis occurs usually in chloroplasts of mesophyll cells.
The leaves are the only cells which contain chloroplasts, as an objective of the leaf is to absorb sunlight, which is exactly what the chloroplasts, or more specifically the chlorophyll in the chloroplasts do. The chloroplasts themselves are the organelles in which photosynthesis takes place.