Unit 3-Distribution Of Organisms

Question 1

Non-living factors that affect biodiversity.

Answer 1

Abtiotic factors

Question 2

Examples of abiotic factors

Answer 2

Temperature OR Light intensity OR pH OR Oxygen concentration

Question 3

Examples of biotic factors

Answer 3

Predation OR Grazing OR Food availability OR Disease

Question 4

The place an organism lives

Answer 4

Habitat

Question 5

A relationship between animals in which one hunts, kills and eats the other

Answer 5

Predation

Question 6

A feeding relationship between two organisms in which one organism benefits and the host is harmed

Answer 6

Parasitism

Question 7

Percentage of energy lost at each level of a food chain

Answer 7

90%

Question 8

Percentage of the energy in food used for growth

Answer 8

10%

Question 9

Ways in which energy is lost at each level in a food chain

Answer 9

Heat OR Movement OR Undigested food

Question 10

A diagram with the width of each bar representing the number of organisms at that feeding level in a food chain

Answer 10

Pyramid of numbers

Question 11

A diagram with the width of each bar representing the total mass of organisms at each stage of a food chain

Answer 11

Pyramid of biomass

Question 12

A method for sampling ground living invertebrates in an area by placing concealed pits for them to fall into

Answer 12

Pitfall traps

Question 13

A square placed on the ground before counting the plants inside

Answer 13

Quadrat

Question 14

Ways to reduce sampling error with quadrats or pitfall traps

Answer 14

Place randomly

Take many samples

Question 15

Reason for sampling several times with a quadrat

Answer 15

Increase reliability

Question 16

Instruments used to measure abiotic factors

Answer 16

Light meter

OR Moisture meter

OR pH meter

OR Thermometer

Question 17

Helped to identify organisms

Answer 17

Biological keys

Question 18

Their presence or absence indicate environmental quality/levels of pollution

Answer 18

Indicator species