Download Gozo, Malta - Gozo College Boys` Secondary School

Gozo College
Boys’ Secondary
Victoria - Gozo, Malta
‘Ninu Cremona’
Half Yearly Examination 2010 – 2011
Form 3
Biology
Name: ____________________
Time: 1½ Hours
Class: _________
Section A: Answer all the Questions in this section.
1. Name the vital function performed by each one of these organisms.
a) A potted plant increased in size over a few months. ____________________
b) After putting a pair of tropical fish (male and female) in an aquarium, offspring were
produced by them. _________________________
c) A cat ran away when a dog came chasing after it. ________________________
d) When going fishing, one must stay quiet because fish will get scared off if they sense the
person. ____________________________
e) Although we can swim under water, we have to come up to get oxygen for the release of
energy from the food that we eat. ________________________
(Total: 5 marks)
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2. When looking through the light microscope Tony observed many cells.
a) Can you help him label the diagram of one of these cells?
b) What type of cell is this? ____________________________
(4 marks)
(1 mark)
c) Give three main differences between plant and animal cells.
1. ________________________________________________________________________
2._________________________________________________________________________
3. ________________________________________________________________(3 marks)
d) What is a tissue? Give one example.
__________________________________________________________________(1 mark)
e) What is an organ system? Give one example.
___________________________________________________________________(1 mark)
f) How can you calculate the total magnification of a light microscope?
__________________________________________________________________________
__________________________________________________________________(2 marks)
(Total: 12 marks)
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3. The sentences below give a description of some of the characteristics shown by 10
different organisms. Give the group name that best fits each description. The group name
can be the name of a phylum, class or genus.
a) All the organisms in this group have jointed limbs and possess an exoskeleton.
_____________________
b) A unicellular organism that moves using a flagellum. Its genetic material is enclosed
within a nuclear membrane. It is photosynthetic ___________________
c) Organisms possessing a branching body in the form of a mycelium. Lacks chlorophyll.
_______________________
d) Leaves have spore-making sori under their fronds. The underground stem is a rhizome (a
primitive root). ___________________
e) Plant body has a tiny leaves, but no proper stems or roots. Xylem and phloem are absent.
_____________________
f) Forms seeds within cones. Does not produce flowers. _____________________
g) A flower producing plant with narrow elongated leaves, having parallel veins.
________________________
h) Organisms which possess a vertebral column. ________________________
i) These organisms are all aquatic. They have no proper leaves, stems or root. They
produce no seeds or spores. They are photosynthetic. ________________________
j) Have a soft un-segmented body. Have a muscular foot to move around or burrow with.
Some of them possess a shell. ________________________
(10 marks)
4. Match a number in Column A with a letter in Column B
A
B
1.
a. strengthens and supports the plant cell.
mitochondrion
2. cell
b. contains the genetic material of the cell such as DNA. Controls all the
membrane
activities occurring inside the cell.
3. cytoplasm
c. contains the cell sap in plant cells.
4. cell wall
d. supports the organelles inside the cell. Many chemical reactions occur
here.
5. nucleus
e. controls the passage of substances in and out of the cell
6. vacuole
f. contains chlorophyll to trap light energy
7. chloroplast
g. releases energy during respiration
Answers:
1.
2.
3.
4.
5.
6.
7.
(7 marks)
3
5. a. Work out the surface area to volume ratio of the cube with sides 3 cm.
3 cm
(i) Surface Area = ___________________________________________________(2 marks)
(ii) Volume = ______________________________________________________(2 marks)
Surface Area to Volume ratio = ___________________
(1 mark)
b. If the size of the cube is decreased, would the surface area to
volume ratio increase or decrease? ______________________
(1 mark)
(Total: 6 marks)
6. The following is a simple classification diagram of 2 main kingdoms.
Living Things
1 __________________
Vertebrates
3 ___________
Plants
invertebrates
birds
2 ______________
4____________
4
reptiles
Non-flowering
mammals
a) Fill in the blanks on the diagram.
(4 marks)
b) Give one external characteristic of :
(i) mammals ________________________________________________________ (1 mark)
(ii) Birds ___________________________________________________________ (1 mark)
c) Give one example of a reptile ______________________________
(1 mark)
d) Choose a, b, c, or d, to complete the sentence which follows.
(i) giving organisms a name
(ii) putting organisms into groups
(iii) identifying organisms
(iv) describing organisms
To biologists, classification means _________________________________
(1 mark)
(Total 8 marks)
7. The diagram below shows the structure of a common yeast. Study the diagram and then
answer the following questions.
B
C
A
a). To which Kingdom do yeasts belong? __________________________.
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(1 mark)
b). What three major conditions do yeast require to grow well?
1. _____________________________
2. ____________________________
3. _____________________________
(3 marks)
c) Name the three parts labelled A, B, C.
A: ______________________
B: ______________________
C: ______________________
(3 marks)
(Total: 7 marks)
Section B: Answer Question 1 and any other 2 Questions.
1. Read the following passage and then answer the questions:
Viruses and Pandemic flu
Flu pandemics emerge unpredictably every generation or so, with the last three striking in
1918, 1957 and 1968. They get their start when one of the many influenza strains that
constantly circulate in wild and domestic birds evolves in a form that infects us as well. That
virus then adapts further or exchanges genes with a flu strain native to humans to produce a
novel germ that is highly contagious among people
(line 5)
Some pandemics are mild, but some are fierce. If the virus replicates much faster than the
immune system learns to defend against, it will cause severe and sometimes fatal illness,
resulting in an outbreak that could easily claim more lives in a single year than AIDS has in
25 years. Virologists have warned that the next pandemic could sicken one in every three
people on the planet, hospitalize many of those and kills hundreds of millions.
(line 10)
The disease would spare no nation, race or income group. There would be no certain way to
avoid the pandemic. The strain A(H1N1) does not yet pass readily from one person to
another. But the virus is evolving, and some of the affected avian species have now begun
their winter migrations. As a sense of urgency grows, governments and health experts are
working to bolster four substantial lines of defence against a pandemic: surveillance, (line 15)
vaccines, containment measures and medical treatments
‘Preparing for a Pandemic’, by W.W. Gibbs and C. Soares, Scientific American,
November 2005.
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1. a. Why are viruses classified as borderline between living and non-living organisms?
(3 marks)
b. In this extract, various organisms which could become infected are mentioned, such as
birds, humans and also other animals.
Are there any viruses which do not infect any living being? Why?
(2 marks)
c. Draw a typical virus and label it.
(4 marks)
d. Line 6 starts with, “If the virus replicates much faster …”, what does replicate mean?
(1 mark)
Describe in a few sentences, and with the aid of diagrams, the whole process of viral
replication.
(5 marks)
(Total: 15 marks)
2. a) Draw a diagram to show the structure of amoeba. Label the nucleus, cell membrane,
pseudopodia and cytoplasm.
(4 marks)
b) How does Amoeba reproduce? Is this an asexual or sexual type of reproduction?
(2 marks)
c) Explain the importance of a contractile vacuole in fresh water protists.
(4 marks)
d) A student observed that when amoeba is in dilute sea water, its contractile vacuole
contracts at a slower rate than when it is in fresh water. Give a simple explanation for this
observation.
(3 marks)
e) Amoeba has no specialised breathing organs. State how exchange of gases takes place in
this organism.
(2 marks)
(Total: 15 marks)
3. a. Define the following and give one example of each of these occurring in a living
organism:
(i) Osmosis (ii) Diffusion (iii) Active Transport
(3, 3, 3 marks)
b Describe an experiment to demonstrate the principles of ‘diffusion’ or an experiment to
demonstrate osmosis in plant cells (for example in potato cells). A diagram should also be
included.
(6 marks)
(Total: 15 marks)
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4. a. ‘Bacteria is an example of a prokaryotic cell’. Describe this statement.
(2 marks)
b. State two differences between viruses and bacteria.
(2 marks)
c. Draw large labelled diagrams to show the structure of:
(i) a typical bacterium (ii) a plant-like protist
(4, 4 marks)
d. Describe briefly the saprophytic mode of nutrition (extra-cellular digestion) of the named
fungus.
(3 marks)
(Total 15 marks)
5 a. Birds such as pigeons have their body covered with feathers. What is the body covering
of each of the following organisms:
(i) lizard
(ii) mouse
(iii) fish.
(3 marks)
b. Write ONE structural characteristics that is common to all four organisms (pigeon, lizard,
mouse and frog) mentioned in ‘a’. (1 mark)
c. The pigeon and the mouse are both endotherms while the lizard and the frog are
ectotherms.
Distinguish between the terms endotherms and ectotherms.
(2 marks)
d. The feathers of a pigeon are covered in oil. Suggest ONE advantage of this.
(2 marks)
e. Explain how feathers insulate birds.
(2 marks)
f. Birds have wings to fly. What brings about movement in each of the following organisms:
(i) a bacterium
(ii) an insect
(1, 2 marks)
g. List TWO structural characteristics that make sharks efficient swimmers.
(2 marks)
(Total: 15 marks)
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