UACE BIOLOGY PAPER 1 2010 - revisionug.com 2025

UACE BIOLOGY 2010 PAPER 1 QUESTIONS AND ANSWERS

This Quiz provides you with the 40 objective question of paper 1 UACE 2010 with their Answer which are well explained at the end of the Quiz.

Answer all Questions

1. A ratio of 3:1 obtained among the offspring in hybrid cross is a result of:

crossing over.

linkage of genes.

non-disjunction.

dominance.

Question 1 of 44

2. A property of water that makes it a suitable component of a hydrostatic skeleton is its.

high density.

high surface tension.

low viscosity.

incompressibility.

Question 2 of 44

3. In humans, the hormone which stimulates the maturation of germ cells is.

luteinizing hormone.

progesterone.

oestrogen.

follicle stimulating hormone.

Question 3 of 44

4. . Fig. 1 represents a human tissue.

Capture2

The tissue would most likely be lining the

salivary glands.

stomach.

ileum.

oviduct.

Question 4 of 44

5. Which one of the following pairs of reactants is not required for the light-independent reactions of photosynthesis?

NADPH and ATP.

ATP and carotenoids.

RUBP and free oxygen.

Carbondioxide and enzymes.

Question 5 of 44

6. The latent heat of evaporation of sweat is 3.15KJcm^-3. What is the percentage of energy lost by sweating from a manual worker who loses 2dm³ per day of sweat and has a daily energy intake of 40,000kJ?

6.30%

7.88%

8.25%

15.75%

Question 6 of 44

7. Figure 2 represents a

tracheid.

xylem vessel element.

sieve tube.

phloem parenchyma cells.

Question 7 of 44

8. Which one of the following describes the chloride shift during transportation of carbon dioxide in mammals?

Hydrogen carbonate ions leave the erythrocytes as chloride ions from tissues, enter.

Chloride ions leave the erythrocytes as hydrogen carbonate ions from tissues, enter.

Chloride ions enter the lungs as hydrogen carbonate ions leave the erythro¬cytes.

Hydrogen carbonate ions enter the lungs as chloride ions leave the erythrocytes.

Question 8 of 44

9. A common features belonging to annelids and arthropods is the.

exoskeleton.

jointed body form.

metameric segmentation.

chitineous cuticle.

Question 9 of 44

10. Which set of products is liberated during both aerobic and anaerobic respiration in plants?

Carbon dioxide and energy.

Ethanol and water.

Water and carbon dioxide.

Carbon dioxide and ethanol.

Question 10 of 44

11. Myelinated axons of a frog conduct impulses three times less fast as those of same diameter in a rat because the

myelin sheath in axons of frogs is thinner.

rat is endothermic.

neurons of a frog have more synapses.

frog lives in water which is cold.

Question 11 of 44

12. Which one of the following is an adaptation in organisms for aquatic conditions?

Development of pollen tube.

Shelled eggs.

Internal fertilization.

Flagellated sperms.

Question 12 of 44

13. Which pair of structures counteracts the stability due to rolling in fish?

vertical and horizontal fins.

Mass of head and vertical fins.

Body flattening and caudal fin.

Streamlined body and horizontal

Question 13 of 44

14. Oxygen from myoglobin is released after oxy-haemoglobin supplies are exhausted because myoglobin

acts as a store of oxygen in resting muscles.

works better when the partial pressure of oxygen is high.

is produced in skeletal muscles when the oxygen demand is low.

has a lower affinity for oxygen than haemoglobin.

Question 14 of 44

15. Increased permeability of a post synaptic membrane to allow chloride ions in, and potassium ions out of the cell causes.

depolarization of the cell membrane.

polarization of the membrane.

excitation of the membrane.

hyper polarization of the membrane.

Question 15 of 44

16. Which one of the following graphs in Figure 3 correctly represents the growth rate of a
multicellular organism?

Question 16 of 44

17. Production of hypertonic urine in animals is mainly achieved by the

Bowman's capsule.

loop of Henle.

proximal convoluted tubule.

distal tubule.

Question 17 of 44

18. The sporophyte generation of flowering plants has a mixture of cells with different nucleic contents because.

of chromosomal mutation in some cells.

they produce megaspores and microspores.

of double fertilization.

the flowers produce fruits and seeds.

Question 18 of 44

19. Algae have much smaller biomass compared to large producers such as trees but may have the same productivity because?

a lot of materials and energy are locked up in the dead xylem tissue of the tree.

the algae have a very high turn-over.

Algae have a high rate of reproduction.

the rate of growth and death in algae is

Question 19 of 44

20. Which one of the following is likely to cause a faster rate of evolution of organisms?

stabilizing selection.

Directional selection.

Disruptive selection.

Slow changing environment.

Question 20 of 44

21. . In an outline for protein synthesis,

Stage 2 represents

transcription.

translation.

transduction.

transformation.

Question 21 of 44

22. It is difficult to observe individual chromosomes during interphase because

the DNA is not yet replicated.

they uncoil to form long, thin strands.

they are dispersed.

homologous chromosomes do not pair up until division starts.

Question 22 of 44

23. Predators in top trophic levels in a food chain are most severely affected by persistent pesticides because

their systems are highly sensitive to chemicals.

they have rapid reproductive rates.

they cannot store the pesticides in their tissues.

the pesticides become concentrated in their prey.

Question 23 of 44

24. Aquatic organisms survive under solidified water bodies because

water solidifies from bottom to top of the lakes.

ice is less dense than water at 4°C.

cold water is denser than hot water and falls to the bottom.

warm water floats on top of cold water.

Question 24 of 44

25. Which one of the following correctly represents the effect of increasing substrate con
centration on the degree of inhibition in a competitive and non-competitive inhibition reaction?

Decreased Increased.

Decreased No change.

Increased Decreased

No change Increased

Question 25 of 44

26. The genetic condition of the spores produced in the sporophyte capsule of the bryophytes
is

tetraploid.

haploid.

Polyploid.

diploid.

Question 26 of 44

27. Cells are limited to small size in order to

keep their volume down.

allow movement of materials in an out of the cells

cut down energy requirements.

enable the nucleus control the cell effectively.

Question 27 of 44

28. Which one of the following enzymes is not secreted by the lining of the ileum?

Lipase.

Sucrase.

Enterokinase.

Lactase.

Question 28 of 44

29. Which one of the following substances would be released by a plant under conditions of
water stress?

Ethene.

Gibberellins.

Indole acetic acid.

Abscisic acid.

Question 29 of 44

30. The more the variation in a population, the greater is its potential to

give rise to gene flow.

adapt to new changes in the environment.

produce more offspring.

grow fast.

Question 30 of 44

31. The correct order of transmission of electrical impulses to initiate the heart beat is

sino-atrio node — artria — atrio-ventcular node — purkinje tissue —ventricles.

sino-atrio node — ventricles — atrio-ventricular node — purkinje tissue— atria

atrio-ventricular node — atria — sino-atrio node — purkinje tissue — ventricles

atrio-ventricular node — purkinje tissue — ventricles — artria — sino-artrio node.

Question 31 of 44

32. Large steroid molecules diffuse quickly through cell surface membranes suggesting that the membranes.

consist of non-polar molecules.

are semi-permeable.

are freely permeable.

are made of polysaccharides.

Question 32 of 44

33. Figure 4 shows a system of two cells separated by a semi-permeable membrane.

Which one of the following statements is correct about the movement of water in the system?

Water moves out of both cells A. and B.

Water moves from cell B to A.

There is no net movement of water between the cells.

Water moves from cell A to B.

Question 33 of 44

34. Hydrophytes do not have wax-covered leaves because.

they need much air for fast respiration.

they do not need to conserve water.

the wax would make the leaves heavy and sink.

their leaves cannot synthesize wax.

Question 34 of 44

35. Cartilaginous fish extract less oxygen from water than bony fish because the former

live in sea water.

are relatively bigger in size.

employ parallel flow system of gaseous exchange.

possess large gills with small surface area volume ratio.

Question 35 of 44

36. Usually, Na+ and K+ are actively pumped out of a red blood cell. When the cell is treated with a metabolic poison, it burst because

the metabolic poison weakens the cell surface.

accumulation of Na+ and K+ inside the cell alters its water potential.

the influx of K+ damages the structure of the surface.

accumulation of Na+ inside the cell al¬ters its water potential.

Question 36 of 44

37. Which of the following statements is true?

Meiosis produces gametes for sexual re¬production or spores for asexual reproduction.

Only diploid cells can divide by meiosis but both haploid and diploid cells can divide by mitosis.

if mitosis produces a multi-cellular organism after fertilization, but before meiosis that organism is haploid.

mitosis produces a multi-cellular organism but meiosis occurs before fertilization, that organism is haploid.

Question 37 of 44

38. Nitrifying bacteria convert ammonia into nitrates in order to

enrich the soil.

generate energy for synthesis of organic compounds.

maintain the nitrogen cycle.

reduce the amount of nitrogen in the atmosphere.

Question 38 of 44

39. Which one of the following couples is likely to produce a fetus suffering from foetal erythroblastosis?

Rh+ mother and Rh- father.

Rh- mother and Rh- father.

Rh+ mother and Kh+ father.

Rh- mother and Rh+ father.

Question 39 of 44

40. Three counts of 103, 46 and 20 of a plant species, were made using a quadrant of 25cm². The density of the plant per m² is

169.

56.3

225.

676

Question 40 of 44

41.

(a) How does the synthesis of organic compound in photosynthetic bacteria differ from that in

(i) green plants

Question 41 of 44

42.

(a) How does the synthesis of organic compound in photosynthetic bacteria differ from that in

(ii) chemosynthetic bacteria?

Your comments:

Question 42 of 44

43. b). Figure 5 show a scheme of reactions occurring in a chloroplast during photosynthesis.

41b

Name the chemical substance represented by letter W, X, Y and Z

Your comments:

Question 43 of 44

44. State three adaption s of a chloroplast for photosynthesis.

Your comments:

Question 44 of 44

UACE BIOLOGY 2010 PAPER 1 QUESTIONS AND ANSWERS

2 thoughts on “UACE BIOLOGY PAPER 1 2010”

Leave a Comment Cancel Reply

Contact us

Excel for the better future

Quick Links

Important Links