Standard Science Primary 4 Systems

A layer of oil was spread on the underside of all the leaves of a plant. After a few days, the plant died. Which process was primarily affected?

A Transport of food by the stem
B Exchange of gases through stomata
C Pollination by insects
D Absorption of water by roots
Show Worked Solution

Worked Solution

Step 1: Most stomata (tiny pores) are found on the underside of leaves. Step [2-9]: Stomata allow the plant to take in carbon dioxide for photosynthesis and release oxygen. Step [2-9]: Blocking them with oil prevents gas exchange, stopping photosynthesis and eventually killing the plant.

Correct answer: Exchange of gases through stomata

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

Start Free Trial — 7 Days Free