Multiple choice

To make their own food, plants need...

  1. light, water, air and mineral salts

  2. light, soil, air and mineral salts

  3. light, water, soil and mineral salts

  4. soil, water, air and mineral salts
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A Correct answer
Explanation

Photosynthesis requires light energy, water, carbon dioxide (from the air), and mineral salts. Soil itself is not strictly necessary as long as the plant has access to water and dissolved minerals, as demonstrated in hydroponics.

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