B7 Ecology Flashcards Preview

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Flashcards in B7 Ecology Deck (42)
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1

Define the term ecosystem.

An ecosystem includes all of the living things interacting with each other, and also with their non-living environment.

2

Give an Example of an Abiotic factor

Abiotic factors are the non living components of an ecosystem so things such as the soil pH, light levels, wind speed, water content etc.

3

Define a 'Community'

A group of organisms or a population of different species occupying a particular area.

4

Name a producer on this food web

The Grass.

5

Name a secondary consumer on this food web.

snake or lizard

6

What are the mising labels on the water cycle? Starting with the arrows up from the sea to the sun and working clockwise.

Evaporation, Condensation, precipitation.

7

What is a detritovore?

An organism that eats detritus (decaying matter).

8

What is a saprophyte?

A fungus or plant which feeds on detritus by secreting enzymes which help digest the detritus.

9

Name a process which locks carbon away.

Photosynthesis or sedimentation

10

Name a process which adds carbon to the carbon cycle

Respiration or Combustion

11

What does 'biodiverse' mean?

An area with a large number of different species living there.

12

What is a pesticide?

A chemical which kills pests, used in farming methods.

13

What is a herbicide?

A chemical used in agriculture which kills weeds.

14

What can cause algal blooms in lakes and result in Eutrophication?

Fertilisers

15

Name a gas responsible for causing acid rain.

Sulpher or nitrogen oxides.

16

What produces sulphur dioxide responsible for acid rain?

Cars and factories.

17

Name an effect of acid rain on the environment.

Limestone buildings and grave stones worn away, trees die, lakes too acidic for fish to survive.

18

Name a fossil fuel

natural gas, coal, oil.

19

What effect does the action of destroying peat bogs have on the gases in the atmosphere?

Increases the amount of carbon dioxide.

20

Describe one effect of deforestation on the environment.

Destroys habitats

reduces biodiversity

disruption of food chains

21

Name a gas responsible for Global warming.

Carbon dioxide, Methane.

22

Biodiversity can be reduced by these things:

H

I

P

P

O

Habitat destruction

Invasive species

Pollution

Population Increase

Overharvesting

 

23

What are Trophic Levels?

TRIPLE ONLY

They are the feeding levels within a food chain.

24

What is a top or 'Apex' predator?

TRIPLE ONLY

A predator that has no predators of its own.

25

Where is trophic level one found on a pyramid of biomass?

 

TRIPLE ONLY

At the bottom.

26

Approximately how much biomass is transferred from one trophic level to another?

TRIPLE ONLY

10%

27

How is the energy lost at each trophic level?

TRIPLE ONLY

MRS GREN

Movement, Respiration, Senses, Growth, Excretion, Nutrition

28

Why is most energy lost between the transfer from producer to consumer?

TRIPLE ONLY

Much of the plant material (cellulose) is indigestible and is simply excreted.

29

Calculate the missing respiration value.

TRIPLE ONLY

100-63-4 =33KJ

30

Calculate the efficiency for this diagram.

TRIPLE ONLY

Only 4 kJ of the original energy available to the bullock is available to the next stage, which might be humans. The efficiency of this energy transfer is:

efficiency = 4⁄100 × 100 = 4%