22. The American alligator is a(n) ____ because it plays a number of important r
ID: 218083 • Letter: 2
Question
22. The American alligator is a(n) ____ because it plays a number of important roles in the ecosystems where it is found in the southeastern United States.?
a.
?endemic species
b.
?specialist species
c.
?keystone species
d.
?exotic species
e.
?indicator species
23. Surface-level ocean currents are caused by ____.
a.
?upwelling near the equator and downwelling near the poles
b.
?prevailing winds blowing over the ocean surface and the Coriolis effect
c.
?warm ocean water exchanging with cool ocean water
d.
?dense ocean water sinking
e.
?cool ocean water rising
Indicate whether the statement is true or false.
24. ?Deserts are always hot places.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
25. ?HIPPCO is ____.
a.
?an acronym to summarize the health care right to privacy act
b.
?an trading company in Africa that sells hippopotamus hides
c.
?an acronym to summarize the direct causes of extinction resulting from human activities
d.
?an acronym that summarizes the Endangered Species Act goals
e.
?the name of an ecotourism company in Africa that specializes in hippopotamus sightings
Indicate whether the statement is true or false.
26. Most of the earth’s species of flowering plants depend on insects to pollinate their flowers.
a.
True
b.
False
27. When biologists talk about the “survival of the fittest”, the fittest individuals are those that leave the most descendants, not those that are physically the strongest.
a.
True
b.
False
22. The American alligator is a(n) ____ because it plays a number of important roles in the ecosystems where it is found in the southeastern United States.?
a.
?endemic species
b.
?specialist species
c.
?keystone species
d.
?exotic species
e.
?indicator species
Explanation / Answer
22. American alligator is a keystone species.
Keystone species are those species which play an essential role in structure of ecosystem and determine survival of other species. For example, if American alligators become endangered, population of game fishes may also decrease.
Correct option is c.
23. Surface level ocean current are caused by prevailing wind blowing over the ocean surface and the Coriolis effect.
Coriolis effect states that, due to rotation of earth, the circulating air is deflected. In the northern hemisphere, air is deflected towards the right and in the southern hemisphere, air is deflected towards the left. The air thus follows a curved path. Surface currents are generated due to prevailing or trade wind and their deflection angles.
Correct option is b.
24. Dessert is a part of dry land, which receives rainfall less than 25 centimetres per year, or loses water fast by evapotranspiration. Climate of desert may vary during seasons, with some deserts featuring extremely hot periods, while some with extreme low temperature periods. While some deserts are hot deserts, like Sahara, some are cold deserts, like Gobi Desert.
Correct option is b, false.
25. HIPPCO is an acronym, describing:
1. Habitat destruction and degradation.
2. Invasive species.
3. Population growth.
4. Pollution control.
5. Climate change.
6. Over harvesting.
Thus, HIPPCO summarizes, the human causes affecting and leading to extinction.
Correct option is c.
26. Pollination refers to deposition of pollens from anthers (male reproductive part of flower) to stigma (female reproductive part of flower). Pollination may occur by factors like, wind, water, small animals etc. But, major pollinating agents are insects. Insects like bees, thrives, wasps, flies, moths, help in pollination, while their feeding process on nectars of flowers.
Correct option is a, true.
27. The concept of “survival of the fittest” was proposed as Darwinian theories of evolution. The term “fittest” here is not conceptual with the physical strength or fitness. It majorly reflects the ability to reproduce to produce a vast progeny or reproductive success of an individual.
Correct option is a, true.
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