Multiple choice

Which of the following layers of a leaf is not a photosynthetic tissue?

  1. Upper epidermis

  2. Palisade cells

  3. Spongy layers

  4. Lower epidermis
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A Correct answer
Explanation

This is a single layer of cells containing few or no chloroplasts. The cells are quite transparent and permit most of the light that strikes them,  to pass through, to the underlying cells. The upper surface is covered with a waxy, waterproof cuticle, which serves to reduce water loss,  from the leaf.

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