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Flashcards in ecology Deck (22)
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Describe the nitrogen cycle.

Plants absorb nitrogen from the soil and release it into the air as atmospheric nitrogen. It then comes down as precipitation and is turned into useable nitrogen by nitrogen fixing bacteria in the soil. Animal waste containing nitrogen also enters the soil where it is broken down so it can be absorbed.

1

Describe the carbon cycle.

Plants absorb atmospheric carbon when performing photosynthesis the carbon then becomes part of the plant and when the plant dies it is released as organic carbon into the soil. When animals die organic carbon is released into the soil. Plant and animal respiration and the burning of oil releases carbon into the atmosphere.

2

What is parasitism?

A relationship where one organism benefits and one organism is negatively affected.

3

What is commensalism?

A relationship where one organism benefits and one organism has no effect.

4

What is mutualism?

A relationship where both organisms benefit.

5

What is the nitrogen cycle?

the movement of nitrogen between the atmosphere, biosphere, and geosphere

6

What is the carbon cycle?

The movement of carbon between the atmosphere, biosphere, geosphere, and oceans.

7

What is a niche?

an animal's role in society

8

What is transporation?

When water evaporates from plant's leaves in the hydrologic cycle

9

What is the ten percent rule?

Each time you move up the food pyramid you multiply 10% times the amount of organisms.

10

What is respiration?

how organisms turn food into useable energy

11

What is photosynthesis?

how plants make food

12

What is the difference between food chains and food webs?

food chain- single transfer of energy
food web- multiple transfers of energy

13

Wha is trophic level one in a food chain?

the producer

14

What is intraspecific competition?

competition between organisms of the same species

15

What is interspecific competition?

competition between organisms of different species

16

Describe three different growth patterns.

linear- increasing at the same rate
exponetial- increasing at increasing rates
logistic- s shape

17

What is carrying capacity?

The max of something a place can have.

18

Name two density dependent factors.

-food
-water

19

Name two density independent factors.

-drought
-disease

20

What four things determine a place's density?

-mortality
-natality
-immigtation
-emigration

21

What effect does human population growth have on the environment?

-more deserts
-more oil being burned speeds up global warming