Q: In the grasslands, trees do not replace the grasses as a part of an ecological succession because of
a) insects and fungi
b) limited sunlight and paucity of nutrients
c) water limits and fire
d) None of the above
Correct Answer: Option (c)
- Ecological succession typically begins when the existing biological community has been cleared away by human activity or natural disturbance such as a fire or severe storm. The population of trees that once lived in this area can’t grow back because the fire has changed the ground composition. Without tree roots to act as anchors, rain washes away the soil and the ground becomes rocky and barren. This rocky ground, however, proves ideal to lichens, the pioneer population. Mosses and herbs are well suited to living in the shallow soil environment created by the lichen, and they replace the lichen as the dominant population. Hence, option (c) is correct
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