Pregunta 18

Why can the ordinary underground roots of a plant not carry out photosynthesis?

Their cells contain no chloroplasts to capture lightRespuesta correcta
Their cells take in ready-made food from the soil instead
Their cells are too busy absorbing water to make sugar
Their cells only make sugar at night, when the soil is cool

Explicación

Photosynthesis can only happen where there are chloroplasts, and ordinary root cells have none, so exposing a root to light does not turn it into a sugar-making organ. Roots are absorbing structures: what they take from the soil is moisture and dissolved minerals, never food, and absorbing water does not prevent a cell from doing anything else.

Explicación

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