Download B3 - miss-lovell-presents

Orientation Responses
This worksheet covers:
 tropisms
 auxin
1. Describe the difference between innate and learned behaviour.
2. Explain tropic responses using an example to illustrate.
3. Explain the difference between a positive and negative tropism.
4. Complete the following table:
Tropism
Positive phototropism
Negative
phototropism
Positive geotropism
Negative geotropism
Positive hydrotropism
Description
Example
Survival Advantage
Tropism
Description
Example
Survival Advantage
Positive
chemotropism
Negative
chemotropism
Positive
thigmotropism
Negative
thigmotropism
5. Draw annotated diagrams, one showing the action of auxin on cell growth in a shoot tip. The other
showing the action of auxin on cell growth in a root tip.
Shoot tip
Root tip
6. Explain apical dominance. In your explanation include the role of auxin.
7. Describe etoliation and explain its survival advantage.
8. Below are some terms you should be familiar with. Complete the table by either writing a definition or
stating the term defined.
A_______________
Non-living, chemical and physical factors in the environment.
Adaptation
A_______________
A plant hormone that promotes root formation and bud growth.
Biotic
C_______________
Prefix for chemical .
Effectors
E________________
Long, spindly and yellowing growth as a result of insufficient light.
Geo-
P_______________
Prefix for light.
Receptor
S________________
Tropisms
A detectable change in environment.