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Thursday, September 15, 2005

Addiction causes serious damage. Example, lung cancer due to smoking.

Differences of the palisade layer and the spongy mesophyll layer:

- Cells in the palisade layer are elongated and this increases its surface area for increased absorption of light energy. However, cells in the spongy mesophyll layer are usually irregular in shape, some being almost circular.

- More chloroplasts are found in cells of the palisade layer than the spongy mesophyll layer. (This is because the palisade layer is situated close to the epidermis of the leaf whereby high amounts of light energy can be obtained.)

- Minute spaces are present in the spongy mesophyll layer but not in the palisade layer. (This allows efficient gasesous exchange to take place.)

- Cells in the palisade are arranged in an orderly manner and closely packed but in the spongy mesophyll layer, cells are loosely arranged with no order of arrangement.


Yeah...