Standard Science Primary 5 Systems

Siti covered the underside of all the leaves of a plant with a thick layer of oil. After a week, the plant died. Why?

A The plant could not exchange gases through the stomata.
B The plant could not absorb sunlight.
C The oil was poisonous to the plant.
D The plant could not take in water through the leaves.
Show Worked Solution

Worked Solution

Step 1: Stomata are small pores found mostly on the underside of leaves. Step [2-9]: Stomata are used for gas exchange (taking in CO2/O2 and releasing water vapour). Step [2-9]: Blocking them with oil prevents respiration and photosynthesis, leading to death.

Correct answer: The plant could not exchange gases through the stomata.

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

Start Free Trial — 7 Days Free