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Some examples from this set of practice questions
1.
Name 3 plant hormones
Answer: Auxins, Gibberellins and Abscisic Acid
2.
What is the purpose of auxins
Answer: auxins bring about a bending reaction due to tropisms they promote cell division they are responsible for cell enlargement they are responsible for apical dominance they promote root development
3.
What is the purpose of gibberellins
Answer: Helps with seed germination Increases fruit size Promotes floral development Promotes sprouting of dormant buds Elongates the internodes of stems Stimulates root growth
4.
What is the purpose of abscisic acid
Answer: Promotes aging of leaves closes stomata in periods of drought Induces flowering Brings about dormancy in apical buds and slows germination
5.
Explain phototropism
Answer: The growth movement in response to the stimulus of light auxins are produced at the tip of the stem from where they move downwards evenly The even distribution of auxins brings about equal growth on all sides of the stem The stem grows straight upwards when the stems are exposed to a unilateral light, the brightly lit side suffers from a shortage of auxins because they are destroyed by the light or because they move to the darker side A high concentration of auxins promotes growth Thus an uneven distribution causes an uneven growth, with the darker side growing faster this causes the stem to bend towards the light
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