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State two ways in which growth regulators in plants are similar to hormones in animals - Leaving Cert Biology - Question c - 2013
Question c
State two ways in which growth regulators in plants are similar to hormones in animals. Name a plant growth regulator that promotes growth and give a precise locati... show full transcript
Worked Solution & Example Answer:State two ways in which growth regulators in plants are similar to hormones in animals - Leaving Cert Biology - Question c - 2013
Step 1
State two ways in which growth regulators in plants are similar to hormones in animals.
Answer
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Chemical Nature: Both growth regulators and hormones are chemical substances that are produced in one part of the organism and affect another part.
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Transport Mechanism: They are transported slowly through vascular tissues; in plants, via phloem or xylem, while hormones in animals are transported in the bloodstream.
Step 2
Name a plant growth regulator that promotes growth and give a precise location for a site of action.
Answer
One plant growth regulator that promotes growth is Indole-3-acetic acid (IAA), which acts at the tip of the shoot or root, specifically in the meristematic zone or the zone of elongation.
Step 3
Step 4
Outline two uses of growth promoters in horticulture.
Answer
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Encouraging Rooting in Cuttings: Growth promoters can be used to enhance rooting in plant cuttings, facilitating plant propagation.
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Promoting Weed Management: Some growth promoters act as weed killers or help in producing seedless fruits and assist in micro-propagation and tissue culture.
Step 5