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Logical Reasoning · 6 questions · about 1 min to read

Agricultural Monocultures

Read the passage, answer the questions, then open each answer to check it. The explanation says why the right option is right.

The passage

Read, then answer

Agricultural monocultures — the practice of cultivating a single crop species over large areas — dominate global food production. The efficiency gains of monoculture are well documented: specialisation, mechanisation, and economies of scale make large-scale single-crop farming more productive per unit of labour than diverse small-scale farming. Yet these efficiency gains come with a cost that does not appear in farm accounts.

Biodiversity within agricultural landscapes performs ecosystem services that monocultures cannot. Pollinators — bees, butterflies, and other insects — require diverse floral resources that monocultures do not provide. Natural pest predators — birds, beetles, and parasitic wasps — require habitat complexity that monocultures eliminate. The consequence is a dependence on chemical pesticides and artificial pollinators. Genetic uniformity within monocultures also creates catastrophic vulnerability: a single pathogen adapted to the dominant strain can devastate an entire crop, as the Irish Potato Famine of the 1840s demonstrated.

The tension between productive efficiency and ecological resilience has no simple resolution. Diversified farming systems are more resilient but less productive per unit of land under current economic conditions. Whether this trade-off is addressed through regulation, subsidies, or market mechanisms depends on choices that are ultimately political rather than technical.

  1. Q1. The passage identifies which of the following as an advantage of monoculture?

    1. Greater resilience to crop disease and pest outbreaks
    2. Greater biodiversity within the agricultural landscape
    3. Higher productivity per unit of labour through specialisation and mechanisation
    4. Reduced dependence on artificial chemical inputs
    Show answer

    Answer: C. Higher productivity per unit of labour through specialisation and mechanisation

    The passage states: 'specialisation, mechanisation, and economies of scale make large-scale single-crop farming more productive per unit of labour than diverse small-scale farming.'

  2. Q2. The Irish Potato Famine of the 1840s is cited in the passage to illustrate:

    1. The political failures of colonial administration in Ireland
    2. The catastrophic vulnerability of genetically uniform monocultures to a single pathogen
    3. The importance of international food aid in agricultural crises
    4. The environmental consequences of land clearance for agricultural use
    Show answer

    Answer: B. The catastrophic vulnerability of genetically uniform monocultures to a single pathogen

    The passage uses the Famine as a historical example: 'Genetic uniformity within monocultures also creates catastrophic vulnerability: a single pathogen adapted to the dominant strain can devastate an entire crop, as the Irish Potato Famine of the 1840s demonstrated.'

  3. Q3. According to the passage, the dependence of monocultures on chemical pesticides arises because:

    1. Chemical pesticides are cheaper than biological pest control methods
    2. Monocultures eliminate the habitat complexity required by natural pest predators such as birds, beetles, and parasitic wasps
    3. Government subsidies for chemical inputs make them more economically attractive
    4. Chemical pesticides are more effective than natural pest predators on large-scale farms
    Show answer

    Answer: B. Monocultures eliminate the habitat complexity required by natural pest predators such as birds, beetles, and parasitic wasps

    The passage states: 'Natural pest predators — birds, beetles, and parasitic wasps — require habitat complexity that monocultures eliminate. The consequence is a dependence on chemical pesticides.'

  4. Q4. The passage concludes that the tension between productive efficiency and ecological resilience:

    1. Can be resolved through advances in genetic engineering of crop varieties
    2. Requires a global treaty on agricultural biodiversity
    3. Has no simple resolution and involves choices that are ultimately political rather than technical
    4. Will be resolved naturally as market prices for ecological services rise
    Show answer

    Answer: C. Has no simple resolution and involves choices that are ultimately political rather than technical

    The passage states: 'Whether this trade-off is addressed through regulation, subsidies, or market mechanisms depends on choices that are ultimately political rather than technical.'

  5. Q5. Which of the following, if true, would most undermine the argument that monocultures are more efficient than diverse farming systems?

    1. A study showing that small-scale diverse farms produce more calories per hectare when the full cost of pesticides, fertilisers, and artificial pollination is included
    2. A finding that bee populations are declining globally due to habitat loss
    3. Evidence that the Irish Potato Famine was primarily caused by British trade policy rather than crop genetics
    4. Data showing that genetically modified crop varieties can replicate the pest resistance of diverse farming systems
    Show answer

    Answer: A. A study showing that small-scale diverse farms produce more calories per hectare when the full cost of pesticides, fertilisers, and artificial pollination is included

    The passage claims monocultures are more productive per unit of labour under current conditions. If, when full ecological costs (pesticides, fertilisers, artificial pollination) are included, diverse farms produce more per hectare, the efficiency advantage of monoculture is undermined.

  6. Q6. The 'ecosystem services' provided by biodiversity in agricultural landscapes, as described in the passage, include:

    1. Providing cheap labour for harvesting and processing
    2. Pollination by insects and natural pest control by birds and other predators
    3. Improving soil drainage and reducing the need for irrigation
    4. Generating carbon credits that can be sold by farmers
    Show answer

    Answer: B. Pollination by insects and natural pest control by birds and other predators

    The passage describes these ecosystem services: pollinators (bees, butterflies) that require diverse floral resources, and natural pest predators (birds, beetles, parasitic wasps). These are the biodiversity-provided services monocultures cannot sustain.

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