Life In Earth Test Revision 28/05/18 Flashcards Preview

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Flashcards in Life In Earth Test Revision 28/05/18 Deck (23):
1

What is biodiversity?

The total variation of living things

2

What does biodiversity provide for humans

Food
Medicine
Raw materials
Recreation/tourism
Plan and animal gene variety for breeding

3

What are some natural hazards

Forest fires
Earthquakes
Tsunamis
Floods
Volcanic activity

4

Define the following: Habitat, Population, Community & Ecosystem.

Habitat - where an organism lives
Population - a group of one species
Community - all the living organisms in a ecosystem
Ecosystem - all the living organisms and non living components in a particular habitat

5

Name the different sampling techniques

Quadrants
Pond net
Sweep netting
Tree beating
Pitfall traps
Tullgren funnel

6

Why are sampling techniques repeated, random and used as the same techniques

To increase reliability

7

Name 3 biotic factors

Food availability
Disease
Grazing

8

Name 3 abiotic factors

Light intensity
Moisture content of soil
Temperature

9

Where does all energy come from

The sun

10

What two categories do organisms fall into (food chains)

Producers or consumers

11

What are all green plants (food chains)

All green plants are producers

12

How do plants get their energy

They convert the suns light energy into chemical energy
This process is called photosynthesis

13

What do the arrows in a food chain represent

Direction of energy flow

14

Where is energy lost in a food chain

Heat, movement and undigested material

15

How much energy is passed on through the food chain

10% used for growth and repair

16

What is a stimulus?

A change in the environment which triggers a response

17

What is a response

A reaction taken to a stimulus

18

What are examples of stimulus

Light
Chemicals
Temperature
Sounds
Touch

19

What are 3 examples of rhythmical behaviour

Migration
Hibernation
Tidal rhythm

20

What is an adaptation

A change that allows an organism to be best suited to an environment

21

What are fertilisers

Chemicals added to the soil to make plants more fertile by replacing nutrients

22

What are pesticides

Chemicals which destroy plants

23

What is a biological control

Natural predators added to prey of pests