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Think about What Green Plants Need - Practice 1

Green plants use light, water and carbon dioxide to make sugars.

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Green plants use light, water and carbon dioxide to make sugars. They also need suitable conditions and mineral nutrients. Soil can supply water and minerals, but plants do not eat soil as their main food.

Worked example

A leaf can use light energy to help make sugars from water and carbon dioxide. A plastic leaf cannot do this.

Schematic flowering plant with broad leaves, an upright stem and branching roots. Labels: Leaves make sugars; Stem carries water; Roots take up water. Parts cooperate; this drawing is not to scale.
Schematic flowering plant with broad leaves, an upright stem and branching roots. Labels: Leaves make sugars; Stem carries water; Roots take up water. Parts cooperate; this drawing is not to scale.
Question 1 A growing green plant has water and air but is kept in total darkness for a long time. What is missing for photosynthesis?
Question 2 A plant has light and air but its roots have no water available. What is missing?
Question 3 Which gas supplies carbon for sugars made by a green plant?
Question 4 What do green plants make using photosynthesis?
Question 5 What can roots take from their surroundings along with water?