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stomata distribution in a dicot leaf
Title: stomata distribution in a dicot leaf
Category: Science & Technology / Biology
Details: Words: 1100 | Pages: 4.7 (approximately 235 words/page)
stomata distribution in a dicot leaf
Aim: To investigate and compare the distribution density of stomata in the upper and lower epidermis of a dicotyledonous leaf.
Stomata are the principle means of gas exchange in plants. Stomata are small pores they are controlled by guard cells which control the opening and closing of stomata. Stomata allow carbon dioxide to enter the plant, and allow water and excess oxygen to escape. About 90% of water is lost from the leaf during transpiration.
The …showed first 75 words of 1100 total…
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…showed last 75 words of 1100 total…stretching of the cell causes stomata to open.
There are factors that affect the opening and closing of stomata. The factors are:
(1) Light – stomata are open in light and closed in dark.
(2) Photosynthesis – when in carbon dioxide free air stomata open even in the dark. Increase in carbon dioxide concentration stomata close even in light.
(3) Temperature – above 25ºC stomata are closed.
(4) Transpiration – if losing more water through leaves than absorbing through roots the stomata close.
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