Populations：练习题

Which term describes all the populations of different species living and interacting together in a specific area?

In a sigmoid population growth curve, what is the primary characteristic of the exponential (log) phase?

A graph shows the population of a bacterial colony over 48 hours. The curve rises steeply and then levels off at a constant value.

What is the relationship between birth rate and death rate during the period when the curve is horizontal, and what is the role of limiting factors here?

A biologist is conducting research in a specific region of a tropical rainforest. During their study, they record the population sizes of a species of spider monkey, several different species of fruit trees they inhabit, and the average monthly rainfall.

Which term correctly describes the spider monkeys, the fruit trees, and all other living organisms interacting within that specific area?

The diagram represents a food web in a stable lake ecosystem. If a disease drastically reduces the population of top predators, what is the most likely long-term effect on the producers in this ecosystem, assuming no other external changes occur?

Distinguish between the terms community and ecosystem by describing the relationship between populations and their physical environment.

In the context of a sigmoid curve of population growth, compare the factors that determine the transition from the exponential (log) phase to the stationary phase in an environment with limited resources.

The growth of a population of yeast in a closed container with a limited supply of glucose follows a sigmoid growth curve.
(a) Describe the characteristics of the exponential (log) phase and explain why growth is so rapid during this time.
(b) Explain the factors that lead to the stationary phase and the subsequent death phase in this yeast population.