CBSE Class 10 Answered
photosynthesis (stomata)
Asked by gunjansingh | 25 Jan, 2010, 05:11: PM
Expert Answer
Stomata are mostly found in the lower part of the leaf as an adaptation to prevent excess water loss. Dicot leaves are held horizontally and hence upper epidermis is directly illuminated. The stomata must be open during the daylight hours to let oxygen and carbon dioxide pass through. While they are open, water vapor escapes into the atmosphere (transpiration). If the stomata are on the lower surface, they are not directly exposed to the sun, and they are a little more protected from breeze - both of which lessen the amount of transpiration (water evaporation) that occurs.
Answered by | 28 Jan, 2010, 08:45: AM
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