Keystone Test Keystone Biology: Ecology and Homeostasis 2

Question 1

Which term describes the relationship where one organism benefits and the other is harmed?

Accepted Answer

Parasitism

Answer

Parasitism involves one organism (the parasite) benefiting at the expense of the host.

Question 2

What is the carrying capacity of an ecosystem?

Accepted Answer

The maximum population size an environment can support

Answer

Carrying capacity is the largest population size that an environment can sustainably support given available resources.

Question 3

Which type of symbiosis benefits both organisms involved?

Accepted Answer

Mutualism

Answer

In mutualism, both organisms benefit from the relationship, such as bees pollinating flowers while collecting nectar.

Question 4

What is the primary source of energy for most ecosystems on Earth?

Accepted Answer

Sunlight

Answer

Sunlight is captured by producers through photosynthesis and forms the energy base for most food webs.

Question 5

What happens to a population when birth rate exceeds death rate?

Accepted Answer

The population grows

Answer

When births outnumber deaths, the net population size increases over time.

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