GCSE EDEXCEL BIOLOGY TRANSPORT IN PLANTS

GCSE EDEXCEL BIOLOGY TRANSPORT IN PLANTS

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  • Created on: 01-03-10 00:49
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Transport in Plants
Water is lost through the pores which are called stomata. The water evaporates
which is known as transpiration. These pores open during the day to allow gas exchange for
photosynthesis; but water is also lost.
Things effecting transpiration
Temperature ­ The hotter it is, the quicker the rate of transpiration.
Light Intensity ­ If there is a lot of light the pore open for photosynthesis therefore quicker rate.
Humidity ­ If the air is humid there is moisture in the air therefore hard to evaporate.
Wind Speed ­ Wind increases the rate too. If it's humid the wind blows away the moisture in the air,
replacing it with dry air.
Way to reduce water loss
1. Some plants have tiny hairs on their leaf. This way the leaf creates a microclimate around the
leaf so that when water is evaporated is keep some under the hairs so that the air is humid
therefore less water is lost.
2. Some leaves have needle like points. This reduces the surface area so that less water can be
evaporated.
3. Some leaves have a waxy layer. This way the water cannot escape from the leaf.
4. Some leaves can be folded. This way they also create a humid microclimate slowing down the
rate of water loss.

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