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As part of your Biology course you were required to examine plant shoots and leaves for evidence of pathogens and insect pests - HSC - SSCE Biology - Question 28 - 2013 - Paper 1
Question 28
As part of your Biology course you were required to examine plant shoots and leaves for evidence of pathogens and insect pests. List TWO observations that indicated... show full transcript
Worked Solution & Example Answer:As part of your Biology course you were required to examine plant shoots and leaves for evidence of pathogens and insect pests - HSC - SSCE Biology - Question 28 - 2013 - Paper 1
Step 1
List TWO observations that indicated the presence of pathogens on plant shoots and/or leaves.
Answer
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Black spots on leaves: This is often a sign of fungal infections, which can indicate the presence of pathogens affecting leaf health.
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Appearance of 'fur' (mould) on leaves: The growth of mould is indicative of fungal pathogens that can affect overall plant vitality.
Step 2
Describe how TWO named methods have changed the way we manage disease and/or insect pests.
Answer
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Genetic Engineering of Crops: This method has allowed for the development of crops that possess insect resistance by inserting specific genes that contribute to this resistance. This has significantly reduced reliance on chemical insecticides, leading to more sustainable pest management practices.
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Quarantine Restrictions: Implementing quarantine measures has been essential in controlling the spread of diseases. By restricting the movement of potentially infected plants, we can prevent the wider dissemination of plant diseases, thereby maintaining healthier ecosystems and reducing the economic impact of pest outbreaks.