Think about What Green Plants Need - Practice 2

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.

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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.

Would you believe it?

The Moon shines in our sky mainly by reflecting sunlight. Being bright to our eyes does not mean an object makes its own visible light.

Question 1 A green seedling is shaded so completely that no light reaches it. What input is blocked? its name light gravity

Question 2 A growing plant dries because its available water is used up. Which supply needs attention in this paper example? water paint music

Question 3 Which gas from the air is an input for photosynthesis? helium neon carbon dioxide

Question 4 Does a green leaf make its sugars mainly by eating soil? Yes; light is unnecessary. No; it uses photosynthesis. Yes; soil is already leaf sugar.

Question 5 Why can a plant grow without ordinary soil in a properly supplied system? Water and mineral nutrients can be supplied another way. Plants never need nutrients. Roots only need a label.

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