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Flashcards in Ecosystems Deck (21)
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1

What is the biogeochemical cycles

Cycle of certain compounds move between biotic and abiotic compartments in the environment

2

What is required by all organisms and part of membranes and nuclei acids

Phosphorus

3

What is a food chain

Single flow (linear) interactions between species

4

What is a food web

Complex interactions (non linear) between species in food webs.

5

A permeable underground layer of rock, sand and gravel saturated with groundwater

Aquifer

6

Upper, unconfined portion of groundwater which flows into streams and is partly accessible to plants

Water table

7

Becomes available to organisms almost entirely through metabolic activities of few genera of bacteria

Nitrogen

8

Heterotrophs must obtain organic molecules synthesized by

Autotrophs

9

The total amount of energy fixed per unit of time minus amount of energy expended by metabolic activities of photosynthetic organisms in the community

Net primary productivity

10

What is the percent of sunlight captured by photosynthesis

1%

11

Element present in small amounts to limit growth of plants

Phosphorous

12

What percent of CO2 does photosynthesis fix?

10% of CO2 in atmosphere

13

What are detritivores

Organisms that break down organic matter

14

What doesn't undergo biogeochemical cycles

Energy

15

Where does the water that reaches the atmosphere come from

Plant transportation

16

Nitrogen fixers are

Prokaryotes

17

Scarcity of which two elements limits plant growth

Nitrogen
Phosphorus

18

How does energy mainly enter the ecosystem

Photosynthesis

19

What contains no species that are autotrophs

Fungi

20

What are primary consumers

Herbivores

21

Amount of organic matter produces in given time available for heterotrophs

Net primary productivity