Advanced Science Primary 6 Energy

A plant was kept in a sealed container with a carbon dioxide absorbent. After several hours in sunlight, the leaves were tested for starch. Why did the iodine solution remain brown?

A The plant lacked carbon dioxide to make food.
B The plant had no light energy.
C The plant was respiring too quickly.
D The plant could not take in water.
Show Worked Solution

Worked Solution

Step 1: Photosynthesis requires light, water, and carbon dioxide. Step [2-9]: The absorbent removed carbon dioxide from the air. Step [2-9]: Without carbon dioxide, the plant cannot produce glucose/starch.

Correct answer: The plant lacked carbon dioxide to make food.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free