An autotroph is an organism that can produce its own food through photosynthesis or chemosynthesis. Algae contain chlorophyll and perform photosynthesis, making them autotrophic.
- (B) Mushroom – Incorrect; mushrooms are fungi and obtain nutrients by decomposing organic matter (heterotrophs).
- (C) Grasshopper – Incorrect; grasshoppers consume plants (heterotrophs).
- (D) Butterfly – Incorrect; butterflies feed on nectar and cannot produce their own food (heterotrophs).
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