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Symbiosis (mutualism, commensalism, parasitism) Knowledge-Based Practice

Biology · Ecology · Biology · Communities & Interactions

5 Biology practice questions on Symbiosis (mutualism, commensalism, parasitism). Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Although both parasitism and predation are characterized as (+/-) interactions, how does parasitism fundamentally differ from predation?

    • A) Parasites are exclusively microscopic unicellular organisms, whereas predators are always macroscopic animals.
    • B) Parasites synthesize their own organic nutrients autotrophically, whereas predators ingest heterotrophic biomass.
    • C) Predation reduces prey population growth, whereas parasites have no measurable impact on host survival or reproduction.
    • D) Parasites generally maintain an intimate, prolonged physical association with a living host rather than immediately killing it.
  2. 2.

    Which of the following correctly identifies the net fitness effects on the two interacting species for mutualism, commensalism, and parasitism, respectively?

    • A) Mutualism: (+ / 0); Commensalism: (+ / +); Parasitism: (+ / -)
    • B) Mutualism: (+ / -); Commensalism: (+ / 0); Parasitism: (+ / -)
    • C) Mutualism: (+ / +); Commensalism: (+ / 0); Parasitism: (+ / -)
    • D) Mutualism: (+ / +); Commensalism: (+ / -); Parasitism: (+ / 0)
  3. 3.

    Which type of symbiotic relationship is defined by a close, long-term interaction in which both participating organisms derive a net benefit?

    • A) Mutualism
    • B) Commensalism
    • C) Parasitism
    • D) Amensalism
  4. 4.

    A tapeworm living in the intestines of a mammalian host absorbs digested nutrients, causing nutritional deficiency and tissue damage to the mammal over time. Which type of symbiotic relationship is best exemplified by this interaction?

    • A) Commensalism
    • B) Parasitism
    • C) Mutualism
    • D) Predation
  5. 5.

    Which of the following ecological interactions exemplifies commensalism, in which one species benefits while the other is neither helped nor harmed?

    • A) Barnacles attaching to the skin of a baleen whale to gain access to nutrient-rich feeding currents without affecting the whale
    • B) Nitrogen-fixing bacteria living within the root nodules of legumes, exchanging ammonium for plant-synthesized carbohydrates
    • C) A tapeworm residing in the intestinal tract of a mammal, absorbing pre-digested nutrients and causing host malnutrition
    • D) Mycorrhizal fungi enveloping plant roots to supply mineral phosphorus while receiving photosynthetic sugars

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