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S.6 revision test Jan 2014
BIOLOGY 1
TIME: 1 ½ HOURS
All questions are compulsory and answers should be written in the spaces provided.
1. The part of the brain responsible for breathing in man is:
A. Medulla oblongata B.Cerebrum C.Pineal body D.Hypothalamus
2. Which one of the following conversions takes place in Humans under
conditions of
starvation?
A .Fatty acid to carbohydrate.
B. Proteins to carbohydrates.
C. Glucose to lipids.
D. Lipids to lipoproteins.
3. Which one of the following blood cells provide target cells for the AIDS virus?
A. Erythrocytes. B .Thrombocytes. C. lymphocytes. D .Phagocytes
4. Which wavelength from the light spectrum is mostly absorbed by the green
plants?
A. Red.
B. Green.
C. Blue.
D. Yellow.
5. Which one of the following animals has a double circulatory system?
A. Fish.
B. Octopus.
C. Blue Whale
D. Squid
6. Which one of the following is not homeostatically regulated in the body?
A. Glucose.
B. Water.
C. Carbon dioxide.
D. Fat.
7. Which one of the following describes the green house effect?
A. Depletion of the ozone layer increases atmospheric temperature.
B. The earth retains the heat it gains from the sun.
C. Increasing atmospheric carbon dioxide prevents heat loss from the earth.
D. The earth gives out carbon dioxide which prevents light rays from the
Sun from reaching the earth.
8. Plant roots in association with symbiotic bacteria is an indication that
A. The plant is unhealthy.
B. The soil around the roots lacks nitrogen.
C. The soil around the roots lacks water.
D. The roots have a viral infection.
9. Which one of the following would you expect to decrease at successive levels of
food chain?
A. Total number of consumers.
B. Total energy content.
C. Biomass.
D. Concentration of pollutants in organisms.
10. The figure below shows a longitudinal section of a root apex
Y
What main activity takes place in region Y?
A. Differentiation.
B. Meiotic cell division
C. Cell expansion.
D. Mitotic cell division.
11. Which one of the following is the correct arrangement of microtubules in a
cross section of a flagellum?
A.9 + 0
B.9 + 4
C.9 + 2
D. 9 + 1
12. Which one of the following describes the structure of Polychaeta?
A. Diploblastic coelomate.
B. Diploblastic acoelomate.
C. Triploblastic coelomate.
D. Triploblastic acoelomate.
13. In which of the following plants showing alternation of generations is the
Sporophyte generation dominant?
A. Mosses.
B. Algae.
C. Liverworts
D. Ferns.
14. The main difference between endotherms and ectotherms is that
ectotherms
A. gain their body heat from internal sources.
B. gain less heat than endotherms.
C. gain the body heat from external sources.
D. are lower animals while endotherms are higher animals.
15. Which one of the following adaptations of xerophytes does not reduce
Transpiration?
A. Hairy leaves.
B. Leaves with thick waxy cuticle.
C. Small sized leaves.
D. Succulent stems
16. Which of the following is the correct sequence of electron flow in the light
reaction in green plants?
A. Water, photosystem II, NADPH, photosystem I.
B. Photosystem I, photosystem II, NADPH, water.
C. Photosystem I, water, NADPH, photosystem I.
D. Water, photosystem II, photosystem I, NADPH.
17. Spirogyra always displays one of the following modes of nutrition :
A. Saprophytic nutrition B Saprozoic nutrition
C. Holozoic nutrition
D Holophytic nutrition
.
18. Which one of the following statements is not correct about seed
dormancy?
A. It allows further development of the seed
B. It is induced by internal factors
C. It increases the chances of survival of the seed.
D. It is ended by external factors.
19. Which one of the following is not a problem that endoparasites face in
their transmission?
A. Leaving the host
B. Entering the host.
C. Living away from the host
D. Identifying the host
20. Which one of the following statements is correct about the
exponential phase in the population growth?
A. Death rate and birth rate are equal.
B. Numbers of individuals and rate of growth increase.
C. The numbers outstrip the supply of factors for support.
D. Slow growth of the population
21. A probable function of the endoplasmic reticulum is to
A. control the entry and exit of materials in cells,
B. facilitate intracellular transport of materials,
C. act as a template in protein synthesis,
D. enable substances diffuse against concentration gradie nt.
22.
Which one of the following is not a correct statement about nastic
response?
A. The response may be a growth movement.
B. The direction of movement of a plant is always related to the direction of
the stimulus.
C. It is a response from a non-directional stimuli
D. The response movements are localized
23. The digestive enzymes produced by the gastric glands act on the following
except one?
A. Starch.
B. Protein.
C. Fats.
D. Caseinogen
24. Which one of the following organisms does not belong to the same
phylum as the rest?
A. Taenia
B. Plasmodium
C. Fasciola
D. Schistosoma
25. Which one of the following statements is true about a fully turgid sell?
A. Turgor pressure + suction pressure = osmotic pressure.
B. Suction pressure = osmotic pressure + turgor pressure.
C. Osmotic pressure + wall pressure = suction pressure - turgor pressure
D. Wall pressure + suction pressure = turgor pressure - osmotic
pressure.
26. A slide of the transverse section of a plant, examined under a microscope
Shows
The following features: Sclerenchymatous bundle sheaths, large
numbers of vascular bundles with phloem on the outside scattered in the
tissue, The slide is likely to be the:A. stem of a dicotyledon
B. root of a dicotyledon .
C. Stem of a monocotyledon
D. root of a monocotyledon
27. Which one of the following is a function of fibrous proteins in the body?
A. Act as buffer in the blood plasma.
B .Form structural proteins.
C. Are vital constituents of the plasma membrane.
D. Form enzymes.
28. Which one of the following statements best describes Paramecium.
A. Unicellular organism having trichocysts.
B. Triploblastic multicellular organism.
C. Diploblastic multicellular organism
D. An animal with three distinct cell layers.
29. A woman produced five children. The first two children were girls
followed by a boy. The last two children were again girls, What is the
probability that the six child will be a boy?
A.1/2
B.1/4
C.1/5
D.1/6
30. In order to determine if an organism is homozygous dominant, it should be
crossed with an organism that is
A. recessive
B. heterozygous
C. hybrid
D. homozygous dominant
31. Chloride ions CI" are necessary for the proper functioning of salivary
Amylase enzyme. CI- ions act as:
A. Prosthetic groups.
B. Activator.
C. Cofactors.
D. Coenzyme
32. In which prophase stage are the chromosomes longer and thinner?
A. Zygotene.
B. Pachytene.
C. Leptotene.
D. Diplotene
33. To which of the following phyla does a flat worm belong?
A. Nematoda.
B. Arthropoda
C. Platy helminthes.
D. Coelenterates.
34. Self pollination in plants is inhibited by:
A. The dioecious condition.
B. The self compatibility.
C. Having the anthers longer than the stigma.
D. The androecium and gynoecium maturing at the same time.
35. Which of the following groups of terrestrial animals is most adapted to
Water Conservation
A. Mammal.
B. Insects.
C. . Birds.
D. Reptiles
36. A testcross was performed using a heterozygous purple flowering pea
plant. What fraction of off springs had white flowers?
A. 3/4
B.1/4
C.ALL
D.1/2
37. Which one of the following organisms does not belong to the same
phylum as the rest?
A Tape worm
B. Liver fluke
C. Planaria
D. Leech
38. Which one of the following insects does not posses compound eyes?
A. Fruit fly B. Termite C.dragonfly D .Moth
39. Which of the following distinguishes visceral muscles from striped
muscles?
Visceral muscle
striped muscle
A .Not striated
Striped
B. Innervated by somatic nervous system
innervated by autonomic
C. Fibres are bound together to form bundles Fibres not bound
together
D. Rapid response Slow in response
40. The cell wall pressure equals the osmotic potential of a cell
A .when the diffusion pressure deficit is zero.
B. At incipient plasmolysis.
C. at complete plasmolysis.
D. at partial turgor
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SECTION B
41. In man there is agene which sickle cell anemia when in a homozygous state
Death usually occurs before adulthood heterozygous persons generally appear
normal ,but under low oxygen concentration their red blood cells may also
become sickle shaped.
A young woman about to be married, had a brother who died of sickle cell
anemia worried about the possible prospect of the condition occurring in her
children ,seeks medical advice. When samples of her blood are taken and
placed in low oxygen concentration, her red cell become sickled. However, her
prospective husband’s blood remains normal.
i. What could you tell her about her children?
Show your working by including her and prospective husband’s
phenotypes
ii. What can you say about her parents? show your working.
A
B
C
ENZYME ACTIVITY
1
2
3
4
5 6
7
8 9
PH
In the figure above, what is the optimum pH for the activity of enzyme B?
……………………………………………………………………………………………………………………………
b)Give an example of an enzyme which could be represented by(2 marks)
i. Activity curve
A…………………………………………………………………………………………………….
ii. Activity curve………………………………………………………………………………….
c) Why does enzyme activity of C decrease at pH values between 8 and 9?(2
marks)
d) Why is pH control important in a living cell?(3 marks)
e) How are minimal deviations from the normal pH values in cells dealt with?
43.By means of a table, place each of the following organisms into a correct
Kingdom, phylum and class: Amoeba, bee, Irish potato, Crab, Earthworm, Man,
Millipede,
Moss,
Octopus,
Pine