Growth regulators in plants can promote growth or inhibit it - Leaving Cert Biology - Question 8 - 2009
Question 8
Growth regulators in plants can promote growth or inhibit it.
(a) Give an example of each of the following:
(i) A growth regulator that promotes growth
(ii) A growth... show full transcript
Worked Solution & Example Answer:Growth regulators in plants can promote growth or inhibit it - Leaving Cert Biology - Question 8 - 2009
Step 1
A growth regulator that promotes growth
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Answer
An example of a growth regulator that promotes growth is Auxin (IAA or NAA), often used to stimulate cell elongation and growth in plants.
Step 2
A growth regulator that inhibits growth
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An example of a growth regulator that inhibits growth is Abscisic Acid, which plays a crucial role in preventing growth during stress conditions.
Step 3
Name the plant that you used
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The plant I used for the investigation is the common bean plant (Phaseolus vulgaris).
Step 4
Describe how you carried out the investigation
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The investigation was carried out by taking cuttings from the common bean plant and applying different concentrations of Auxin to separate groups of cuttings.
Preparation: Prepare two groups of cuttings with equal size and health.
Treatment: Apply different concentrations of Auxin to each group, ensuring to use a control group without any regulator.
Replication: Conduct the experiment in replicates for reliability.
Control: Maintain a consistent light and temperature condition for all groups
Observation: Observe the growth over a defined period, recording any changes.
Step 5
Give a safety precaution that you took while carrying out the investigation
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A safety precaution taken during the investigation was to wear gloves while handling the growth regulators to avoid any skin contact.
Step 6
State the results that you obtained
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The results indicated that the cuttings treated with Auxin showed improved growth rates compared to the control group, with noticeable differences in root length and leaf development. Additionally, higher concentrations generally resulted in more significant growth effects.
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