Scientists investigated the movement of sucrose through a plant. They used carbon dioxide containing radioactive carbon, $$\({ }^{14} \mathrm{C}\)$$. They covered one leaf on a plant with a clear plastic bag containing $$\({ }^{14} \mathrm{CO}_{2}\)$$. After 24 hours, the plant was placed onto photographic film. The photographic film went black where the radioactive carbon was present. Diagram 1 shows the plant at the start of the experiment, and diagram 2 shows the photographic film at the end of the experiment. diagram 1 diagram 2 Which conclusions can be made from the experiment? 1 Translocation occurs in upwards and downwards directions. 2 The leaf and shoot tip are sources. 3 The roots and flowers are sinks.

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