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An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The...

      

An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The amount of water was determined in two hour intervals. The results are shown in the table below.
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(a) Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day.
(b) At what time of the day was the amount of water the same for transpiration and absorption.
(c) Account for the shape of the graph of
(i) Transpiration
(ii) Absorption
(d) What would happen to transpiration and absorption of water if the experiment was continued till 0050 hours.
(e) Name two factors that may affect transpiration and absorption at any given time.
(f) Explain how the factors you named in (e) above affect transpiration.

  

Answers


sharon
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(b) 17:00 – 19:00
(c) (i) 11:00 – 19:00 hours
- There was rapid increase in the rate of transpiration;
- This was due to high light intensity;
- Also due to high temperature;
(ii) 11:00 – 19:00 hours
- There was increase in the rate of absorption of water to replace water lost through transpiration;19:00 – 3:00 hours
- There was decrease in the rate of water absorption.
- This is because the rate of transpiration had declined;
(d) Both transpiration and absorption would decline;
(e) - Wind;
- Humidity;
- Atmospheric pressure;
- Temperature;
- Light;
(f) - Wind – The rate of transpiration is faster when it is windy and lower when air is still;
- Temperature – Rate of transpiration is high at high temperature and low at low temperature;
- Humidity – When humidity is low, the rate of transpiration is faster while the rate of transpiration is low when humidity
is high;
- Atmospheric pressure – The rate of transpiration is high when atmospheric pressure is low while at high atmospheric
pressure, the rate of transpiration is low;
- Light intensity – It affects photosynthetic rate hence opening and closing of stomata that allows for water loss;
sharon kalunda answered the question on May 28, 2019 at 05:32


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