Microorganisms and decay — Question Bank (Cambridge) — Cambridge IGCSE Physics 0625 Revision Notes & Topical Questions

Cambridge Lower Secondary Stage 7

Question 1
Paper Ref: 0610/12_Winter_2025_Q15

Which term can be used to describe all disease-causing organisms?
A bacteria
B decomposers
C_ pathogens
D
viruses

Options:
A
B
C
D
Correct Key: C

Question 2
Paper Ref: 0610/11_Winter_2025_Q34

The diagram shows part of a food web in a pile of dead leaves.
centipedes
aN
bacteria nN mites
NN a“
\ 2
Which row describes the organisms?
bacteria centipedes leaves
A consumers herbivores producers
B decomposers carnivores decomposers
Cc decomposers consumers producers
D producers carnivores producers

Options:
A
B
C
D
Correct Key: C

Question 3
Paper Ref: 0610/13_Summer_2022_Q37

What is the name of an organism that obtains its energy from dead organic material?
A carnivore
B consumer
C decomposer
D herbivore

Options:
A
B
C
D
Correct Key: C

Question 4
Paper Ref: 0610/12_Summer_2017_Q36

Fungi can act as decomposers feeding on dead organic matter.
Which statement describes their effect on the carbon cycle?
oo BD
releasing carbon dioxide during photosynthesis
releasing carbon dioxide during respiration
using carbon dioxide for photosynthesis
using carbon dioxide for respiration

Options:
A
B
C
D
Correct Key: B

Question 5
Paper Ref: 0610/13_Summer_2019_Q36

Letters H, J, K and L show the organisms that make up a simple food web.
organism organism
organism
organism
What must organism H be?
A acarnivore
B a decomposer
C aherbivore
D
a producer

Options:
A
B
C
D
Correct Key: D

Question 6
Paper Ref: 0610/21_Summer_2024_Q38

Which organisms remove nitrate ions from soil?
0 OO DW
denitrifying bacteria and nitrogen-fixing bacteria in root nodules
denitrifying bacteria and plants
nitrifying bacteria and plants
nitrogen-fixing bacteria in root nodules

Options:
A
B
C
D
Correct Key: B

Question 7
Paper Ref: 0610/22_Spring_2025_Q36

Which organisms can be sources of energy for decomposers?
producers herbivores carnivores
v v v key
/=yes
00 WwW YP
Jv x x
x Jv Jv X=no
x x x

Options:
A
B
C
D
Correct Key: A

Question 8
Paper Ref: 0610/23_Summer_2012_Q37

The diagram shows a food web.
lettuce plants snakes
Fungi are decomposers. What is their importance in this food web?
oo BD
They control the number of toads.
They provide energy for plant growth.
They provide food for snakes.
They release minerals for plant growth.

Options:
A
B
C
D
Correct Key: D

Question 9
Paper Ref: 0610/23_Summer_2013_Q35

Which organisms do not get their energy by eating other organisms?
A consumer
B decomposer
C herbivore
D
producer

Options:
A
B
C
D
Correct Key: D

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