For
Examiner's
Use
[4]
(c) A student stated that ‘maintaining biodiversity is not important because there are
already hundreds of sorts of different animals and anyway, you just can’t protect these
protected species properly.’
Discuss the extent to which this statement,
(i) defines biodiversity
(ii) addresses the need to maintain biodiversity
(iii) evaluates the available methods of protecting endangered species.
[6]
[Total: 15]
UCLES 2007 9700/4/SP07 final [Turn over
PPMMTT
Question
Biology
CAIE2023
(a) The table shows information about some organisms and their classification.
Complete the table by putting the correct kingdom for each organism described. The
first one has been done for you. Each kingdom may be required once, more than once
or not at all.
Features of organism kingdom
Body composed of single isolated cells.
Heterotrophic eukaryotic cells without a cell wall.
Organism motile. Protoctista
Body composed of a mass of undifferentiated cells. Heterotrophic
eukaryotic cells with a chitin cell wall.
Not motile.
Body composed of a small ball of undifferentiated cells.
Autotrophic eukaryotic cells with a cellulose cell wall and flagellum.
Organism motile.
Body complex and multicellular, differentiated into a variety of tissues
and organs.
Heterotrophic eukaryotic cells with no cell wall, some cells have flagellae.
Organism motile.
Body a string of tiny undifferentiated cells.
Heterotrophic prokaryotic cells with a peptidoglycan (murein) cell wall.
Not motile.
Body complex and multicellular, differentiated into a variety of tissues
and organs.
Autotrophic eukaryotic cells with a cellulose cell wall.
Not motile.
[5]
(b) In traditional classification there were considered to be only two kingdoms; animals
were in one kingdom, and all other organisms were in the other.
Suggest the advantages and disadvantages of such a two-kingdom classification
compared to the five kingdom classification often used today.
UCLES 2007 9700/4/SP07 final
PPMMTT
Question
Biology
CAIE2023
3.841 6.635 10.828
Question
Biology
CAIE2023
5.991 9.210 13.816
Question
Biology
CAIE2023
When only neurone X is stimulated, an action potential will occur in the postsynaptic
neurone.
Question
Biology
CAIE2023
When only neurone Y is stimulated, an action potential will occur in the postsynaptic
neurone.
Yeasts are unicellular organisms from the kingdom Fungi. Saccharomyces cerevisiae is one
species of yeast that can carry out either asexual reproduction by mitosis or sexual reproduction
by meiosis.
Budding in S. cerevisiae is a process where a small daughter cell forms as a bud on the parent
cell. The bud contains a copy of the parent cell nucleus and it eventually separates from the
parent cell to form a new cell.
S. cerevisiae can exist in two forms: haploid cells or diploid cells.
• Haploid cells can be one of two different mating types: a and α.
• Haploid cells can only mate with other haploid cells of the opposite mating type.
Fig. 2.1 shows the life cycle of S. cerevisiae with its asexual and sexual reproductive stages.
Key: a mating type a a α
α
a budding budding
α mating type α
α
a
Question
Biology
CAIE2023
1
a α
α
a
mating
a α
formation of 2
zygote
a α
aα budding
aα
hours
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.
INFORMATION
● The total mark for this paper is 100.
● The number of marks for each question or part question is shown in brackets [ ].
PMT