In this blog you will find the correct answer of the Coursera quiz Ecology: Ecosystem Dynamics and Conservation Coursera Week 3 mixsaver always try to bring the best blogs and best coupon codes

Week- 3

Module Three: What have you learned?


1. In the following simple food chain from Gorongosa National Park (grass → waterbuck → lions), waterbuck represent:


  • primary producers
  • primary consumers
  • tertiary consumers
  • secondary consumers

2. What is a critical factor affecting a community’s composition after a major disturbance?


  • its carrying capacity
  • evolutionary processes (e.g., speciation)
  • the regional species pool
  • the community’s growth rate

3. In this species interaction, both populations have a positive net effect on the population size of the other species:


  • predation
  • competition
  • mutualism
  • commensalism

4. When the interaction between predators and herbivores, or herbivores and plants acts as a major selective force, it is an example of :


  • ecological niches
  • niche differentiation
  • coevolution
  • amensalism

5. An example of parasitism is:


  • the blind pistol shrimp creating a burrow used by both itself and the goby fish for protection, where the goby fish keeps an eye out for predators and alerts the shrimp when danger is near
  • a giraffe trampling the grass around an Acacia tree while grazing on its branches
  • ants protecting Acacia trees from browsing animals by swarming and stinging them, and in return feeding on the tree’s nectar
  • Leucochloridium, a worm that creates caterpillar mimics in snail eyestalks

6. In a bottom-up community, if you remove predators, lower trophic levels:


  • shouldn’t be affected
  • should experience exponential population growth
  • should increase
  • should decrease

7. Certain species can affect entire communities, because:


  • they are highly abundant (e.g., dominant species)
  • they play a pivotal role in community dynamics (e.g., keystone species)
  • of how they influence the physical environment (e.g., ecosystem engineers)
  • any of the above

8. A community may be considered resilient if:


  • It easily changes its composition after a disturbance.
  • It quickly returns to its original state after a disturbance.
  • It maintains its original structure over time regardless of disturbance.
  • It disperses easily.

9. Recall Dr. Pringle’s lecture on the coexistence of species, in which this figure was used to demonstrate the grazing patterns of different species. It depicts the concept(s) of:

Credit: Adapted from Bell, R.H.V., Scientific American 225 (1971): 86-93


  • trophic cascades
  • trophic pyramid
  • niche partitioning
  • all of the above

10. Why is the world green? Choose the figure that best represents the proposed answer to this question.

Image Credits: Corina Tarnita, 2015 HHMI HL



Important Links: