Question

A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?
30 kJ
300 kJ
3,000 kJ
30,000 kJ
Which characteristic best distinguishes runoff and infiltration?
Runoff involves condensation and infiltration involves evaporation.
Runoff occurs over land and infiltration occurs underground.
Runoff occurs during floods and infiltration occurs during drought.
Runoff describes water movement and infiltration describes water storage.
Animals adapted for surviving waves, as well as sudden changes in water level and temperature, would be found in the

What best describes the association between the carbon cycle, plants, and animals?
Plants fix carbon and release oxygen, and animals release carbon and use oxygen.
Animals fix carbon and release oxygen, and plants release carbon and use oxygen.
Animals fix carbon through respiration, and plants fix carbon through photosynthesis.
Plants decompose fixing carbon, and animals decompose releasing carbon.
Which molecule would be the most affected by limited nitrogen?
myofibrillar proteins in muscle
glucose molecules in starch
fat molecules surrounding organs
cellulose molecules in plant cell walls
The Serengeti plains are part of the African savanna ecosystem and are home to a variety of different species of plants and animals. The Serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce.

Which type of limiting factors does the seasonal drought in the Serengeti plains affect?
density-independent factors
density-dependent factors
population-dependent factors
population-independent factors

Answer 1

1) How much energy would a cheetah acquire after eating a zebra that consumed 30,000 kJ of grass?
- 300 kJ (10% transfer per trophic level: grass → zebra = 3,000 kJ; zebra → cheetah = 300 kJ)

2) Which characteristic best distinguishes runoff and infiltration?
- Runoff occurs over land and infiltration occurs underground.

3) Animals adapted for surviving waves, as well as sudden changes in water level and temperature, would be found in the:
- Intertidal (littoral) zone.

4) What best describes the association between the carbon cycle, plants, and animals?
- Plants fix carbon and release oxygen, and animals release carbon and use oxygen.

5) Which molecule would be most affected by limited nitrogen?
- Myofibrillar proteins in muscle (proteins require nitrogen).

6) Which type of limiting factor does the Serengeti seasonal drought affect?
- Density-independent factors (affects populations regardless of their density).