Question 3
- The diagrams below are illustrations of organisms. Study it and answer questions3(a) to 3(e).
(a) (i) Name organisms D, E, F, G and H.
[5 marks]
(ii) Classify eachof organisms D, E and F into their kingdoms.
[5 marks]
(iii) State one way by which organisms D, E, F, G and H are of economic
importance in their habitats. [5 marks]
(b) Complete the table below by grouping organisms D, E, F, G and H under the appropriate headings.
Beneficial to industries |
Disease-causing |
Beneficial to the environment |
|
|
|
|
|
|
|
|
|
[7 marks]
(c) State the mode of reproduction in each of organisms D, E, F, G and H.
[5 marks]
(d) Which of organisms D, E, F, G and H is associated with the following terms?
(i) crystallization:
(ii) hyphae:
(iii) single cell protein:
(iv) capsule formation:
(v) unicellular:
[5 marks]
Observation
Most candidates performed averagely well in this question.
Many of them were able to name organisms D, E, F, G andH and also give the Kingdom of organisms D, E andF, but lost almost all the marks to spelling errors.
Some candidates could not state the economic importance of organisms D, E, F, G and H to their habitats.
Some candidates were able to group organisms D, E, F, G and H into beneficial to industries, disease causing and beneficial to environment; while some did not even know what they were doing.
A few candidates were able to answer question 3 (d) perfectly well.
The expected answers are:
(a)(i) Name of Organisms
D - Rhizopus/mucor/bread mould/mold
E - Amoeba
F - Bacterium
G - Yeast/Saccharomyces
H - Virus
(ii) Classification of D, E, and F
D - Fungi
E - Protoctista/Protista
F - Monera
(iii) Economic Importance
D- it is a decomposer/causes disease in plants
E - forms part of food chain/causes diseases
F - causes diseases/useful in industries
G - used as food/useful in industries/winemaking/ breweries/causes diseases
H - causes diseases
(b) Table
Beneficial to industries |
Disease-causing |
Beneficial to the environment |
Yeast/G |
Amoeba/E |
Rhizopus/mucor/mould |
Bacterium/F |
Yeast/G |
Mold/D |
|
Bacterium/F |
Amoeba/E |
|
Virus/ H |
|
(c) Mode of Reproduction
D - sporulation/spore formation/conjugation/sexual reproduction
E - binary fission/asexual reproduction
F - binary fission/asexual reproduction
G - budding/asexual reproduction
H - replication within a living host/cell