Biology for IGCSE & O level - Variation And Selection (Section 2 - No. 18)
How do the differing seed types (light vs. heavy) in the weeds contribute to their survival in a human-dominated environment?
Lighter seeds are more likely to land on concrete; heavier seeds are more likely to fall close to the parent plant.
Both seed types are equally successful in all environments.
Lighter seeds are easier to carry by wind.
Heavier seeds are less likely to germinate.
Explanation
Different seeds are suited to different dispersal mechanisms and thus, aid survival.
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