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Module 4: Responding to the Environment
5.4.1 Plant Responses

(a) explain why plants need to respond to their environment in terms of the need to avoid predation and
abiotic stress
Like animals, plants must also need to respond to external stimuli. This is important to:
Avoid predation .
Avoid abiotic…

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Module 4: Responding to the Environment
Lateral Meristem In a cylinder near the outside of roots and Width of roots and shoots.
Intercalary Meristem Between nodes (where the leaves and buds Growth between the nodes ­
branch off the stem). length of shoots.
Auxins (such as IAA) are…

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Module 4: Responding to the Environment

(c) evaluate the experimental evidence for the role of auxins in the control of apical dominance and
gibberellin in the control of stem elongation
Apical Dominance:
Apical dominance ­ when a growing apical bud at the tip of the shoot inhibits growth of lateral…

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Module 4: Responding to the Environment

Further studies have shown that gibberellins cause growth in the internodes by stimulating cell elongation (by
loosening cell walls) and (by stimulating production of a protein that controls the cell cycle). Internodes of dwarf
peas have fewer cells and shorter cells than those of…


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