Standard Science Primary 6 Energy

In an experiment, Tim placed a plant in a dark cupboard for 48 hours. He then tested a leaf for starch. What is the most likely result?

A The leaf turns green.
B The iodine solution remains yellowish-brown.
C The iodine solution turns dark blue.
D The leaf produces oxygen bubbles.
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Worked Solution

Step 1: Plants need light to photosynthesise and make starch. Step [2-9]: In the dark, the plant uses up stored starch for energy. Step [2-9]: Since no new starch is made, the iodine test will be negative (remain yellowish-brown).

Correct answer: The iodine solution remains yellowish-brown.

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