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jennifer 發問時間: 社會與文化語言 · 1 0 年前

一些基本的生態學考題 生物 環境 20點 急

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Some biologists think that the mammal-eating killer whales and fish-eating killer whales that

inhabit the same waters off North America's west coast are separate species because they appear to

have been reproductively isolated for over a million years. This would be an example of _______

speciation.

A. allopathic

B. allopatric

C. sympathetic

D. isolating

E. sympatric

Most terrestrial animals acquire oxygen:

A. through their gills.

B. through the membranes in their nasal passages.

C. through their skin.

D. through their lungs.

E. via air sacs.

_______________ defines the number of individuals per unit of available living space.

A. Crude density

B. Abundance

C. Population density

D. Distribution

E. Ecological density

One of the most basic models of population growth is exponential growth. Which of the following

statements is false about exponential growth?

A. The rate of population growth (dN/dt) accelerates as population size increases.

B. The population levels off at carrying capacity due to density independent factors.

C. The exponential growth model predicts populations will grow infinitely large.

D. The intrinsic rate of increase (r) remains constant at all population sizes

E. The exponential growth model describes populations in continuous time where

reproduction is not seasonal

If the birth and death rates of a growing population remain constant through time, the rate of

population growth will __________ through time.

A. increase and then level off

B. decrease and then level off

C. remain constant

D. increase

E. decrease

Exponential growth tends to occur in populations that are found in _________ environments and have

______ population densities.

A. harsh, low

B. favorable, low

C. harsh, high or low

D. harsh, high

E. favorable, high

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  • 1 0 年前
    最佳解答

    1.have been reproductively isolated for over a million years. This would be an example of _______

    speciation.

    D. isolating

    2.Most terrestrial animals acquire oxygen:

    D. through their lungs.

    3._______________ defines the number of individuals per unit of available living space.

    C. Population density

    4.One of the most basic models of population growth is exponential growth. Which of the following

    statements is false about exponential growth?

    B. The population levels off at carrying capacity due to density independent factors.

    5.If the birth and death rates of a growing population remain constant through time, the rate of

    population growth will __________ through time.

    C. remain constant

    6.Exponential growth tends to occur in populations that are found in _________ environments and have

    ______ population densities.

    E. favorable, high

    參考資料: ME
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