Ecology: Ecosystem Dynamics and Conservation Coursera Week 3

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