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Growth regulators are important substances found in plants - Leaving Cert Biology - Question 13 - 2016
Question 13
Growth regulators are important substances found in plants. They play a role in responses to environmental factors. (i) What name is given to the regions of plants ... show full transcript
Worked Solution & Example Answer:Growth regulators are important substances found in plants - Leaving Cert Biology - Question 13 - 2016
Step 1
What name is given to the regions of plants which secrete growth regulators?
Answer
The regions of plants that secrete growth regulators are known as apical meristems. These are specific areas located at the tips of roots and stems that are responsible for the growth and development of the plant.
Step 2
Give an example of a growth regulator which has a negative effect on plant growth.
Answer
An example of a growth regulator that has a negative effect on plant growth is ethylene. This regulator can promote processes such as ripening in fruit, which can lead to premature aging and decline in plant health.
Step 3
Explain the term thigmotropism.
Answer
Thigmotropism refers to the growth response of a plant to touch. This phenomenon occurs when a plant grows towards or away from a touch stimulus. An example of this is seen in climbing plants, such as vines, which wrap around supports as they grow in response to tactile cues.