(a)
(i) What is a tropism?
Growth of a plant in response to a stimulus - Leaving Cert Biology - Question 9 - 2010
Question 9
(a)
(i) What is a tropism?
Growth of a plant in response to a stimulus.
(ii) What is a plant growth regulator?
A substance that controls the growth of a plant... show full transcript
Worked Solution & Example Answer:(a)
(i) What is a tropism?
Growth of a plant in response to a stimulus - Leaving Cert Biology - Question 9 - 2010
Step 1
What is a tropism?
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Answer
A tropism is the growth movement of a plant in response to a stimulus, such as light or gravity. For example, phototropism is the movement towards light, while gravitropism involves growth in response to gravitational forces.
Step 2
What is a plant growth regulator?
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Answer
A plant growth regulator is a chemical substance that influences the growth processes of plants. These regulators can promote or inhibit growth and are often used to regulate physiological processes in plant development.
Step 3
What plant tissue did you use?
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Answer
For the investigation, I used an appropriate plant tissue such as the tips of pea seedlings or leaf segments of bean plants.
Step 4
Describe how you carried out the investigation.
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Answer
To carry out the investigation, I placed the selected plant tissue in a control setup and a treatment setup containing varying concentrations of IAA. I left the tissues in the solutions for approximately two days. After this period, I measured the growth of the tissues by observing changes in length or other growth indicators. Each treatment was replicated to ensure reliability of the results.
Step 5
Describe the control that you used.
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The control used in the experiment consisted of plant tissues treated with water, having no IAA. This allowed for comparison against the tissues exposed to the growth regulator.
Step 6
Compare the results that you obtained in the experiment and in the control.
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Answer
The results from the experiment indicated that the plant tissues exposed to IAA showed enhanced growth compared to the control group. The control tissues experienced minimal growth, confirming the effectiveness of IAA in promoting plant growth.
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