Tobacco mosaic virus (TMV) is a disease affecting plants - AQA - GCSE Biology - Question 2 - 2018 - Paper 1
Question 2
Tobacco mosaic virus (TMV) is a disease affecting plants.
Figure 1 shows a leaf infected with TMV.
All tools should be washed in disinfectant after using them on p... show full transcript
Worked Solution & Example Answer:Tobacco mosaic virus (TMV) is a disease affecting plants - AQA - GCSE Biology - Question 2 - 2018 - Paper 1
Step 1
Suggest why.
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Answer
All tools should be washed in disinfectant after using them on plants infected with TMV to kill the virus or to prevent virus spreading. This is essential to avoid the risk of infecting healthy plants with the virus.
Step 2
Describe how you would test for the presence of glucose in fruit.
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Answer
To test for glucose, heat a sample of the fruit extract and add a few drops of Benedict's solution. If glucose is present, the solution will change from blue to orange upon heating.
Step 3
Explain why plants with TMV have stunted growth.
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Answer
Plants infected with TMV have stunted growth primarily due to reduced chlorophyll production, which impairs photosynthesis. Less chlorophyll means less energy is produced, leading to lower glucose levels. Since glucose is vital for respiration and energy release, its deficiency hinders overall plant growth. Furthermore, this can affect the synthesis of amino acids and proteins essential for plant health, resulting in poor development.
