Question
The diagrams show a virus and a bacterium.
Calculate the magnification of the bacterium.
[1]
a.
State the method that bacteria use to divide.
[1]
b.
Outline the effectiveness of antibiotics against viruses and bacteria.
[1]
c.
Saprotrophic organisms, such as Mucor species, are abundant in soils.
Define saprotrophic organisms.
[1]
d(i).
State one role of saprotrophic organisms in the ecosystem.
[1]
d(ii).
Answer/Explanation
Markscheme
45 000(x) or (x)45000 (accept answers in the range of 44000 to 46 000)
a.
binary fission
b.
effective against bacteria, but not viruses
c.
an organism that secretes enzymes in dead organic matter and absorbs its nutrients/products of digestion
d(i).
decomposer / recycle nutrients / break down organic material into inorganic material
Do not just accept “recycle” alone.
d(ii).