ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants: Investigating the conditions necessary for germination to occur
Materials: maize/bean seeds, containers one of which has a lid, cotton wool, filter paper, pyrogallic acid
Method
- Take four batches with ten seeds in each batch
- Put them in containers as shown in the diagrams above i.e.
- Container a) has water, oxygen and a low temperature
- Container b) has oxygen, a suitable temperature but no water
- Container c) has water, a suitable temperature but no oxygen (pyrogallic acid absorbs oxygen)
- Container d) has water, oxygen and a suitable temperature
- Container d) is the control
- Observe what happens in a few days
Results
- Very few seeds in container a) germinate depending on the seed types used in the experiment
- The Dry seeds in container b) do not germinate at all
- The seeds in container c) do not germinate at allowing
- Most/All of the seeds in container d) germinates
Conclusion
- Seeds are more likely to germinate when there is moisture and oxygen present at an optimum temperature
- Dry seeds do not germinate at allowing
- Light is not necessary for germination to occur as the seedling does not need to photosynthesize in the early days as the required nutrients are stored in the seed
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