B16

Question 1

Ecosystem:

Answer 1

Interaction of a community of living organisms with non living parts of their environment

Question 2

Interdependence:

Answer 2

If one species is removed it can affect the whole community

Question 3

Extremophiles:

Answer 3

Organisms that live in extreme conditions

High pressure
High temperature
High salt concentration

Question 4

ADAPTATION

Dry conditions

Answer 4

Longer ears- increase heat loss

Larger SA:V- increases heat loss

Hump with fat- converts water via respiration

Long eyelashes- keeps dust out of eyes

Hairs on the feet- protection

Question 5

ADAPTATION

Dry conditions for plants

Answer 5

Fewer stomata- reduces evaporation

Thick stem- water storage

Plant leaves covered in wax- reduces water loss and reflects heat
Shallow and longer roots- increases water uptake and reduces competition with others

Leaves fold in(wilt)-reduces surface area

Question 6

BIOTIC FACTORS ACRONYM

Living things

Answer 6

Always Availability of food
Needing New predators arriving
New New pathogens
Ideas Insufficient no. of species to breed

Question 7

ABIOTIC FACTORS ACRONYM

Non living things

Answer 7

Little Light intensity
Things Temperature
Matter Moisture levels
So Soul pH and mineral content
Work Wind intensity
Consistently CO2 levels for plants
Okay O2 levels for aquatic animals

Question 8

Energy lost in food chains:

Answer 8

Respiration

Muscle contraction(movement)

Excretion(faeces)

Question 9

(6) Describe how living things are involved in the constant cycling of carbon.

Answer 9

-photosynthesis in plants absorb CO2 to build organic molecules such as cellulose and proteins

• organisms do cell respiration
• organisms contain carbon in their waste
• feeding on plants absorbing more carbon
• dead organisms decay, carbon returns to soil and their cells respire
• combustion & incomplete thermal decomposition

Question 10

Decomposers:

Answer 10

Breaks down dead organic matter

Bacteria
Maggots
Worms
Fungi

Question 11

Biogas generators:

Answer 11

• Add crop(maize) in generator
• Add decomposers and limit the oxygen so they respite anaerobically
• Methane is produced which is a fuel that can be combusted

Question 12

Manure

Natural fertiliser

Answer 12

• created from dead plants or animal waste
• Rich in nitrogen so when added to soil decomposers they’re able to recycle the minerals
• Better than artificial fertilisers