Multiple choice

Which among the following is the outer layer of the leaf?

  1. The epidermis

  2. Palisade layer

  3. Spongy layer

  4. Veins
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A Correct answer
Explanation

The epidermis is the outer layer of cells covering the leaf. It forms the boundary separating the plant's inner cells from the external world. The epidermis serves several functions: protection against water loss by way of transpiration, regulation of gas exchange, secretion of metabolic compounds, and (in some species) absorption of water.

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