Question 96

A sack of fertiliser is labelled plant food. Which of these claims about fertiliser hold up? Select all that apply.

It is food to a plant in the way that sugar is food
It supplies mineral ions that a plant needs in small amountsCorrect answer
It removes the plant's need for light
It gives the plant no energy at allCorrect answer
It is taken in by the leaves rather than by the roots

Explanation

What a fertiliser adds to soil is the set of dissolved ions a plant uses as raw materials, and those are needed in tiny quantities beside the sugar the plant makes for itself. Energy is a separate matter entirely, since it comes from light and is stored in sugar, so no quantity of fertiliser can stand in for it.

Explanation

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