B17 - Organising an ecosystem

Question 1

photosynthetic organisms

Answer 1

-producers of biomass for life on Earth

Question 2

food chain

Answer 2

producers at the start
-mostly always green

Question 3

primary consumers

Answer 3

eat producers

Question 4

secondary consumers

Answer 4

eat primary consumers

Question 5

producers

Answer 5

synthesises new molecules

Question 6

stable environment

Answer 6

• prey and predator number fluctuates in cycles

Question 7

decomposers

Answer 7

group of micro organisms that feed on waste droppings and dead organisms

Question 8

decomposers eg

Answer 8

fungi
bacteria

Question 9

Detritivores

Answer 9

start process of decay
-eat dead animals and produce waste
-then bacteria digests everything including detritivores

Question 10

detritivores eg

Answer 10

maggots
worms

Question 11

the decay cycle

Answer 11

returns carbon to atmosphere as co2
-used by plants then

Question 12

water cycle

Answer 12

• provides fresh water for animals/plants before draining into sea
  -evaporates + condenses as it rises to form clouds

Question 13

photosynthesis

Answer 13

-remove co2 from atmosphere
-use carbon from co2 to make carbohydrates, proteins (biomass)
- passed on through food chain

Question 14

Respiration

Answer 14

-co2 waste product
-released as decomposers respire

Question 15

combustion

Answer 15

burning fossil fuels
= co2`

Question 16

conditions for decay

Answer 16

-temp
-moisture
- o2

Question 17

use of decay

Answer 17

• farmers: for compost = natural fertiliser

Question 18

bacteria respire anaerobically use

Answer 18

-releases methane
- waste is put in biogas generators
- with anaerobic conditions
- methane is produced + used as fuel

Question 19

conditions for decay - temp

Answer 19

• warm = faster
• cold = slower
• too hot = enzymes in decomposers denature

Question 20

conditions for decay - moisture

Answer 20

easier to digest food
- prevents them from drying out

Question 21

conditions for decay - o2

Answer 21

to allow decomposers to respire