A LEVEL UACE BIOLOGY 2015 QUESTIONS AND ANSWERS PAPER 1 UGANDA

UACE BIOLOGY 2015 PAPER 1 QUESTIONS AND ANSWERS

This Quiz provides you with the 40 objective question of paper 1 UACE 2015 with their Answer which are well explained at the end of the Quiz.

Answer all questions

1. Which one of the following is a characteristic of members of the monera kingdom?

Possession of a true nucleus.

Being single celled.

Possession of Flagella.

Being heterotrophic.

Question 1 of 40

2. Which one of the following cells is haploid?

Primordial germ cell.

Primary spermatocyte.

Spermatogonium.

Secondary spermatocyte

Question 2 of 40

3. The number of trophic levels in a food chain is mainly determined by the

Efficiency of Energy Transfer between Levels.

Biomass of the Producers.

Net Productivity of the Ecosystem.

Species Diversity in the Ecosystem.

Question 3 of 40

4. Some bacteria when infected by microphages may make a particular amino acid they could not make before. This is due to

Transformation.

Mutation.

Transduction.

Conjugation

Question 4 of 40

5. Which one of the following characteristics of a parasite is not a means of ensuring continuity of the species of the parasite?

Degeneration of redundant body structures.

Means of penetrating another organism.

Protection against host enzymes.

Means of dispersing offspring.

Question 5 of 40

6. One problem faced by terrestrial organisms with lungs is that

breathing requires much energy.

oxygen diffuses very slowly in the air.

gas exchange involves water loss.

lungs are deep in the chest thus increasing diffusion distance.

Question 6 of 40

7. The gene for albinism is recessive to that for normal skin pigment in humans. In a population where the frequency of the albinism-causing allele is 10%, the expected proportion of the albinos in the population would be

0.1

0.01

0.8

0.9

Question 7 of 40

8. During which one of the following is the respiratory quotient most likely to be high?

In plants during bright sunlight.

In animals during laying down of fat.

During egg laying in birds.

During lactic acid formation in animals.

Question 8 of 40

9. Figure 1 shows the rate of photosynthesis against light intensity.

123222

Which one of the following statements is the cause of flattening of the curve?

Photosynthetic pigments are saturated with light.

Too much carbon dioxide is available.

The plant has attained its maximum rate of photosynthesis.

There is a factor other than light which is limiting the rate of photosynthesis.

Question 9 of 40

10. Which one of the following representations of genotypes would produce only one type of gametes?

TtHh.

ttHh.

TTHh.

tthh.

Question 10 of 40

11. One reason why lipids are better energy sources than carbohydrates is that they

Are Insoluble.

Do Not Form Hydrogen Bonds With Water.

Are More Compact.

Have a Higher Proportion of hydrogen.

Question 11 of 40

12. Which one of the following events occurs both in mitosis and meiosis?

Synapsis.

DNA synthesis.

Crossing over.

Halving of chromosome number.

Question 12 of 40

13. Which one of the following could result from low levels of progesterone during gestation?

Miscarriage.

Parturition.

Menstruation.

Lactation.

Question 13 of 40

14. What is the advantage of fragmentation over conjugation as a means of reproduction in
spirogyra?

Varied offspring are produced.

Fast-growing offspring are produced.

Many offspring are produced.

More resistant offspring are produced.

Question 14 of 40

15. Which one of the following epithelial tissues lines blood capillaries?

Cuboidal tissue.

Squamous tissue.

Columnar tissue.

Glandular tissue.

Question 15 of 40

16. Which one of the following processes does not involve osmosis?

Movement of water into guard cells.

Movement of water through the xylem.

Entry of water into the vacuole.

Passage of water across the endodermis.

Question 16 of 40

17. The biomass of consumers is always less than that of producers because

producers have to support consumers.

consumers have a low productive rate.

energy is lost through body processes of consumers.

consumers are small in size.

Question 17 of 40

18. Marine cartilaginous fish solves its osmoregulatory problems by

Swallowing Sea Water and having few glomeruli.

Actively extruding salts.

Retaining urea to increase the osmotic potential of the body fluids.

Excreting trimethylamine oxide.

Question 18 of 40

19. If a long-day plant has a critical night length of 10 hours, which one of the following conditions would allow flowering in the plant?

8 hours light and 16 hours darkness.

16 hours light and 8 hours darkness.

12 hours light and 12 hours darkness.

10 hours light and 14 hours darkness.

Question 19 of 40

20. Which one of the following patterns of behavior in rats would be a result of latent learning?

Avoiding to eat poisoned food.

Associating smell with presence of food.

Young rats following their mother.

Being aware of escape routes.

Question 20 of 40

21. Which one of the following plant tissues, have cells with walls least adapted for support?

Sclerenchyma.

Collenchyma.

Tracheids.

Xylem vessels.

Question 21 of 40

22. Which one of the following plant tissues, have cells with walls least adapted for support?

Sclerenchyma.

Collenchyma.

Tracheids.

Xylem vessels.

Question 22 of 40

23. Analysis of a sample of DNA showed that 33% of the bases were adenine. The percentage of guanine bases in the sample was

34.

33.

17.

28.

Question 23 of 40

24. A man with an allele for normal colour vision is married to a woman whose father was colour blind. The probability of the couple getting a child with a defective allele is

1/3

3/4

Question 24 of 40

25. Which one of the following does not occur during photorespiration?

Oxygen is used up.

Wasteful loss of carbon as carbon dioxide.

Carbon dioxide is used up.

Wasteful loss of energy.

Question 25 of 40

26. In estimating the population of Tilapia in a fish pond, 60 fish were captured, marked and released. After 2 days, 50 were captured and out of which 10 were marked. The population of Tilapia in the fish pond was

300

400

200

100

Question 26 of 40

27. In sponges, the different types of cells are independent of each other in function because

the different cells show division of labour.

collar cells maintain the flow of water.

sponges are made up of collar flagellates.

the cells are not coordinated.

Question 27 of 40

28. Figure 2 shows some reactions in the respiratory pathway.

The enzyme which catalysis the reaction marked x is

Pyruvate dehydrogenase.

Acetyl Co A dehydrogenase.

Pyruvate decarboxylase.

Acetyl Co A decarboxylase.

Question 28 of 40

29. Which one of the following is correct about ectotherms?

Have cold blood which is warmed by the surroundings.

Regulate body temperature mainly by metabolic reactions.

Much of the heat in their bodies is gained from the surroundings.

Lack means to regulate body temperature.

Question 29 of 40

30. Which one of the following conditions reduces the affinity of hemoglobin for oxygen?

High oxygen concentration.

High carbon dioxide concentration.

Low body temperature.

High pH of the blood.

Question 30 of 40

31. The insect compound eye receives more stimuli per unit time than the mammalian eye
because the

insect eye occupies a larger part of the head than the mammalian eye.

time lapse between reception of light stimulus and recovery is short.

insect eye has more focusing units than the mammalian eye.

insect eye has a wider field of view.

Question 31 of 40

32. A couple had children with a disorder that appeared only in sons. Which one of the
following statements is true about this occurrences? The disorder is

sex linked and the mother is a carrier.

caused by multiple alleles.

sex linked and both parents are carriers.

sex limited to males and the father is a carrier.

Question 32 of 40

33. A cell is said to have full turgor pressure when

the cell membrane is just touching the cell wall.

water enters the vacuole by osmosis.

water leaves the vacuole by osmosis.

the cell wall cannot be stretched any-more.

Question 33 of 40

34. Which one of the following is not used to describe a population of organisms?

Density.

Biodiversity.

Size.

Distribution.

Question 34 of 40

35. Mosses growing on the bark of a tree form an association with the tree called

Mutualism.

Parasitism.

Commensalism.

Predation.

Question 35 of 40

36. Which one of the following is responsible for increasing the pressure of blood flowing in
veins, back to the heart?

The pumping action of the heart.

Contraction of skeletal muscles.

Closing of valves.

Inspiratory movements of muscles.

Question 36 of 40

37. Which one of the following represents the correct order of events that occurs at the synapse during impulse transmission?

Ca2+ ion influx, release of transmitter substance, depolarization.

Depolarization, release of transmitter substance, Ca2+ ion influx.

Release of transmitter substance, Ca2+ion influx, depolarization.

Release of transmitter substance, depolarization, Ca2+ ion influx.

Question 37 of 40

38. Figure 3 represents the structure of

safa

Amino acid.

Glucose.

Ribose.

Fatty acid.

Question 38 of 40

39. Which one of these is not true about the lock and key theory in an enzyme-catalyzed reaction?

A small change in the active site alters the enzyme effectiveness.

The substrate and active site are complementary.

Enzyme catalyzed actions go through the enzyme-substrate complex stage.

A molecule which fits in the active site is a substrate.

Question 39 of 40

40. The following occur during senescence except

Hardening of arteries.

Shrinking body size.

Increased sensitivity.

Mental senility.

Question 40 of 40

A LEVEL UACE BIOLOGY 2015 QUESTIONS AND ANSWERS PAPER 1 UGANDA

UACE BIOLOGY 2015 PAPER 1 QUESTIONS AND ANSWERS

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