Multiple choice

__________ are flat leaves without an upper or lower surface.

  1. Isobilateral leaves

  2. Needle like leaves

  3. Grooved leaves

  4. Divided leaves
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A Correct answer
Explanation

Isobilateral leaves, which are flat leaves without an upper or lower surface. Ordinary (dorsiventral) plant leaves have an upper, harder surface which faces the sun, and a lower shade-surface where most of the carbon dioxide and water vapour exchange takes place. Isobilateral leaves exchange carbon and water equally through both surfaces, but at a lower rate than dorsiventral leaves.

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