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Some plant extracts contain natural antiseptics - Edexcel - GCSE Biology - Question 3 - 2014 - Paper 1
Question 3
Some plant extracts contain natural antiseptics. A scientist spread bacteria on an agar plate. She then soaked a paper disc in a plant extract and placed the disc ... show full transcript
Worked Solution & Example Answer:Some plant extracts contain natural antiseptics - Edexcel - GCSE Biology - Question 3 - 2014 - Paper 1
Step 1
Suggest why there is no bacterial growth around the paper disc.
Answer
The lack of bacterial growth around the paper disc can be attributed to the presence of natural antiseptics in the plant extract. These substances inhibit bacterial growth or effectively kill the bacteria in the vicinity, creating a sterile zone around the disc. This demonstrates the antibacterial properties of the plant extract used.