Population Size Answers

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1
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What are the biotic and abiotic factors that limit population size?

Answer:

Biotic factors include food availability, predation, competition, and disease. Abiotic factors include water, sunlight, temperature, soil nutrients, and space. These factors limit how large a population can grow in an ecosystem.

2
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A population distribution shows _______.

A
the distribution of age groups within a population
B
the amount of organisms in a unit area
C
the total number of organisms in a population
D
where and in what arrangement organisms are located
3

What are the possible impacts on the limiting factors that determine population size of an extended period of lower than normal rainfall?

Answer:

Extended drought reduces water availability (a key limiting factor). This lowers plant growth and primary productivity, reduces food and habitat for consumers, intensifies competition for remaining resources, and can raise mortality rates, ultimately decreasing carrying capacity and population size.

4

Which of the following species is an R-selected species?

A
Giant tortoises
B
Mosquitoes
C
Elephants
D
Redwoods
7

Which of the following conditions would lead to a small population size?

A
a low birth to death ratio
B
a high birth to death ratio
C
immigration
D
large number of resources
8

How do the biotic and abiotic limiting factors of an ecosystem determine its carrying capacity?

Answer:

Biotic and abiotic limiting factors determine the carrying capacity of an ecosystem by setting the maximum population size the environment can sustainably support. Abiotic factors include non-living resources like water, sunlight, and space, while biotic factors include living interactions such as food availability, predators, and competition. When these factors become limited, population growth slows or stops at the carrying capacity.

9

How does population density differ from population size?

Answer:

Population size is the total number of individuals in a population. Population density is the number of individuals per unit area or volume. Thus, density measures how crowded the population is, while size is simply the count.

10

Why is it important to look at the combination of birth and death rates when considering population size?

Answer:

Looking at both birth and death rates together is important because they determine the overall population growth rate. A high birth rate with a low death rate leads to population increase, while a low birth rate with a high death rate leads to decline. The difference between the two rates shows whether a population is growing, stable, or shrinking.

11

Why is it important to look at the combination of birth and death rates when considering population size?

Answer not available
12

Which of the following species is an R-selected species?

A
Giant tortoises
B
Mosquitoes
C
Elephants
D
Redwoods
13

Identify the abiotic limiting factor from the choices below.

A
biodiversity
B
food
C
water
D
plant cover
14

What are the possible impacts on the limiting factors that determine population size of an extended period of lower than normal rainfall?

Answer not available
15

Orange trees planted in a grove or orchard would most likely fall in which category of population distribution?

A
even
B
random
C
clumped
D
density
16

A population distribution shows _______.

A
the distribution of age groups within a population
B
the amount of organisms in a unit area
C
the total number of organisms in a population
D
where and in what arrangement organisms are located
17

Which of the following conditions would lead to a small population size?

A
a low birth to death ratio
B
a high birth to death ratio
C
immigration
D
large number of resources
18

How does population density differ from population size?

Answer not available
19

How do the biotic and abiotic limiting factors of an ecosystem determine its carrying capacity?

Answer not available
20

What are the biotic and abiotic factors that limit population size?

Answer not available

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