Standard Science Primary 5 Systems

During a very hot afternoon, some plants close their stomata. What is the primary reason for this?

A To stop making food
B To take in more oxygen
C To absorb more sunlight
D To prevent excessive water loss
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Worked Solution

Step 1: Stomata allow for gas exchange and transpiration (water loss). Step 2: On hot days, plants lose water quickly through evaporation. Step 3: Closing stomata helps conserve water to prevent wilting.

Correct answer: To prevent excessive water loss

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