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?
- A.ll
- B.lll
- C.lV
- 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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