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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 absence of bacterial growth around the paper disc suggests that the plant extract acts as an antiseptic that inhibits bacterial growth. This could be due to the presence of compounds in the plant extract that are toxic to the bacteria, preventing them from reproducing or surviving in that area.