Ecology

Question 1

These factors affect all populations in a given area in similar ways, regardless of the population size

Answer 1

Density Independent

Question 2

Define carrying capacity

Answer 2

Largest number of individuals that a given environment can support

Question 3

What type of reproduction is described:

• Reproduce often.
• Have lots of offspring.
• Have short life spans.
• Have offspring that are small and mature rapidly with little parental care.

Answer 3

R-Strategist Reproduction

Question 4

The various processes in the nitrogen cycle are mostly performed by

Answer 4

Bacteria

Question 5

What type of reproduction is described:

• Grow slowly and have small populations.
• Require a stable environment.
• Be near carrying capacity.
• Have long life spans.
• Reproduction late in life.
• Provide extensive care to their young.

Answer 5

K-Strategist Reproduction

Question 6

How do plants incorporate nitrogen into organic compounds?

Answer 6

Assimilation

Question 7

A habitat is

Answer 7

The place where an organism lives

Question 8

The rate at which autotrophs make food

Answer 8

Primary productivity

Question 9

Conversion of nitrates into nitrogen gas

Answer 9

Denitrification

Question 10

Through what process do nitrogen-fixing bacteria make nitrogen into a usable form

Answer 10

Nitrogen Fixation

Question 11

Provide an example of a decomposer

Answer 11

Fungi, bacteria

Question 12

Ammonification is…

Answer 12

The process by which ammonia is made during the decay of organic matter

Question 13

True or false: two different organisms can share the same niche and the same habitat

Answer 13

False

Question 14

What controls the amount of energy available throughout the entire ecosystem?

Answer 14

The rate at which the autotrophs make food (the primary productivity)

Question 15

Erosion and volcanic activity release carbon dioxide into the atmosphere

Answer 15

Geochemical processes

Question 16

When two species use the same resources, or have the same niche, they experience

Answer 16

Competition

Question 17

Water passes from plants to the atmosphere

Answer 17

Transpiration

Question 18

The original source of energy for most organisms in most ecosystems is

Answer 18

The sun

Question 19

What are the two most important aspects of climate?

Answer 19

Temperature and moisture

Question 20

How much energy is transferred from one trophic level to the next? What happens to the rest?

Answer 20

10%

The rest is lost as heat

Question 21

What is evaporation?

Answer 21

Water is heated, turns to gas, and reenters the atmosphere

Question 22

Carbon dioxide is released when living organisms exhale

Answer 22

Respiration

Question 23

The full range of biological conditions in which an organism lives and how it uses those conditions

Answer 23

Niche

Question 24

What trophic level would you place a snake that ate a mouse that ate some grass.

Answer 24

Second level consumer (secondary consumer)

Question 25

Water falls (in some form) from the atmosphere to the Earth

Answer 25

Precipitation

Question 26

What is succession?

Answer 26

Replacement of one community by another as the environment changes

Question 27

Factors that cause a population size to level off or decrease

Answer 27

Limiting Factor

Question 28

Of all nonliving components, which has the greatest influence on the ecosystem’s inhabitants?

Answer 28

WATER

Question 29

What four things influence a population’s growth rate?

Answer 29

Birth Rate

Death Rate

Immigration

Emigration

Question 30

What are the three most important characteristics of a population?

Answer 30

1. žGeographic distribution or range
2. žPopulation density – the number of individuals per unit area

ž3. Growth rate

Question 31

What trophic levels could the hawk be part of?

Answer 31

Tertiary consumer & secondary consumer

Question 32

What is combustion?

Answer 32

—Carbon trapped in living things, like wood, or previously living things, like fossil fuels, is released when the substance is burned