Plants are grown in glasshouses to protect them from the weather or extend the growing season. Plants make food by photosynthesis.

In winter, when days are shorter, glasshouses are heated to keep the enzyme reactions in plants at optimum rates.
What else should a grower do to make sure that the plants are photosynthesising at the optimum rate? Give a reason for your answer.

water

Explanation:

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.