IAA produces a phototropic response in plants
A) by promoting an increase in the number of cells in a section of stem or coleoptile.
B) only when present in high concentrations in a section of stem or coleoptile.
C) by promoting cell elongation in a section of stem or coleoptile.
D) by promoting an increase in the number of cells and an elongation of the cells of the stem or coleoptile.
E) by increasing cell division in the apical tip.
Correct Answer:
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Q8: Phototropism in plants is the
A) bending of
Q9: The plant hormone, indole-3-acetic acid (IAA) is
Q10: Amyloplasts contain
A) auxin.
B) plastids.
C) root cap cells.
D)
Q11: The compound known as 2,4-D
A) is a
Q12: In gravitropism, the plant root bends. This
Q14: IAA is thought to be involved in
Q15: The plant hormones known as cytokinins are
Q16: Synthetic growth retardants
A) reduce vegetative plant growth.
B)
Q17: In addition to stem elongation, gibberellins are
Q18: In barley, gibberellin is produced in the
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