JAMB 2011 Biology · Question 28

I. Parasitism → Sundew. ll. Autotrophism →Amoeba. III. Saprophytism → Alga. IV Heterotrophism → Agama. Which…

Question

I. Parasitism → Sundew. ll. Autotrophism →Amoeba. III. Saprophytism → Alga. IV Heterotrophism → Agama. Which of the above modes of nutrition is correctly matched with the organism that exhibits it?

  1. A.ll
  2. B.lll
  3. C.lV
  4. D.l

Answer: C. lV

Explanation written with AI and checked against the answer key

Analyze the question: We need to find which mode of nutrition is correctly matched with its organism.

Concept: Modes of nutrition

  • Autotrophism: the organism makes its own food (photosynthesis or chemosynthesis), e.g. green plants, algae.
  • Heterotrophism: the organism depends on already-made organic food, e.g. animals.
  • Parasitism: the organism lives on or in a host and feeds at the host's expense.
  • Saprophytism: the organism feeds on dead, decaying matter, e.g. mushrooms, moulds.
  • Holozoic nutrition: feeding by ingesting solid food, e.g. Amoeba.

Checking each statement:

  • I. Parasitism → Sundew: Wrong. Sundew (Drosera) is an insectivorous plant. It traps insects to get nitrogen, but it also photosynthesises. It is not a parasite.
  • II. Autotrophism → Amoeba: Wrong. Amoeba engulfs food particles (holozoic), so it is heterotrophic.
  • III. Saprophytism → Alga: Wrong. Algae contain chlorophyll and are autotrophs.
  • IV. Heterotrophism → Agama: Correct. The agama lizard is an animal that feeds on insects and other organic material, so it is heterotrophic.

Answer: Only statement IV is correctly matched, which is option C.

Tip: In matching questions, test each pair against its basic definition. Remember: plants with chlorophyll = autotrophs, all animals = heterotrophs, Amoeba = a heterotrophic protozoan, and sundew = insectivorous, not parasitic.

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