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Biology for Secondary Schools
Cardboard box
(i) Before experiment
Board
Bean
Radicle (root) Shoot
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Bench
(ii) After 72 hours Shoot
Radicle
Figure 1.7(a): Positive effect of gravity on seedling growth
Cardboard box
(i) Before experiment
Board
Clinostat Bean
Radicle (root) Shoot
Bench
(ii) After 72 hours
Radicle Shoot
Figure 1.7(b): Negative effect of gravity on seedling growth under treatment of clinostat
Conclusion
(a) Provide a conclusion for your experiment.
(b) Write a short report of the experiment.
Hydrotropism grow away from water and are said to be
Hydrotropism is the growth movement of negatively hydrotropic. If you grow a plant
a plant or part of a plant in response to near a water source such as porous pot or
a source of water. Plant roots normally river, the root will always grow towards
grow towards moisture. Therefore roots water as seen in Figure 1.8.
are positively hydrotropic, whereas shoots
10 Student’s Book - Form Three
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