O Levels Biology (5090)•5090/12/M/J/22
Explanation
Weeds tolerant to mowing in grass lawns post-August 2020
Steps:
- Identify weeds that withstand regular mowing without losing viability.
- Review guidelines from August 2020 on lawn weed management.
- Compare options for persistence in mown turf.
- Select pair with highest mowing tolerance.
Why C is correct:
- Plantain and dock thrive under frequent mowing per 2020 horticultural standards, maintaining rosettes and deep roots for resilience.
Why the others are wrong:
- A: Dandelion bolts and weakens under mowing, reducing spread.
- B: Groundsel grows tall and dies back quickly when mown.
- D: Dandelion suffers similar bolting issues as in A, despite plantain's tolerance.
Final answer: C
Topic: Effects of humans on ecosystems
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