BIO250 (2)

CONFIDENTIAL AS/OCT 2007/BIO250

UNIVERSITI TEKNOLOGI MARAFINAL EXAMINATION

COURSE

COURSE CODE

EXAMINATION

TIME

: SYSTEMS AND MAINTENANCE (PLANTS ANDANIMALS)

: BIO250

: OCTOBER 2007

: 3 HOURS

INSTRUCTIONS TO CANDIDATES

1. This question paper consists of two (2) parts : PART A (20 Questions)

PART B (7 Questions)

2. Answer ALL questions from all two (2) parts:

i) Answer PART A in the Objective Answer Sheet.ii) Answer PART B in the Answer Booklet. Start each answer on a new page.

3. Do not bring any material into the examination room unless permission is given by theinvigilator.

4. Please check to make sure that this examination pack consists of:

i) the Question Paperii) an Answer Booklet - provided by the FacultyHi) an Objective Answer Sheet - provided by the Faculty

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SOThis examination paper consists of 7 printed pages

© Hak Cipta Universiti Teknologi MARA CONFIDENTIAL

CONFIDENTIAL 2 AS/OCT 2007/BIO250

PART A

1. Which of the following does not involve a negative feedback mechanism?

A. ThermoregulationB. OsmoregulationC. Blood clottingD. Control of blood sugar level

2. Which of the following statements is true about excreting nitrogenous waste in theform of uric acid?

A. It saves water and energy.B. It saves water but costs energy.C. It saves energy but wastes a lot of water.D. It wastes a lot of water and energy.

3. Most carbon dioxide is carried from the body tissues to the lungs

A. as bicarbonate ions (HCO3").B. as hydrogen ions (H+).C. combined with hemoglobin.D. dissolved in blood plasma.

4. The amount of oxygen bound to hemoglobin

A. increases in the presence of a high oxygen partial pressure.B. decreases in the presence of a high oxygen partial pressure.C. increases with increasing acidity at the tissue level.D. increases as the pH of tissues decreases.

5. The maximum amount of air a person can inhale and exhale is called

A. tidal volume.B. vital capacity.C. residual volume.D. inspiratory capacity.



6. is secreted by and acts to emulsify fat in

A. Lipase — small intestine — large intestineB. Lipase — pancreas — small intestineC. Bile — pancreas — large intestineD. Bile — liver — small intestine

7. External fertilization occurs mostly in

A. insects.B. land animals.C. aquatic animals.D. animals that reproduce asexually.

8. Which of the following statements is not true about the resting potential?

A. The neuron's plasma membrane is much more permeable to potassium ionsthan to sodium ions.

B. The concentration of sodium ions is much higher inside the cell than outside.C. The sodium-potassium pump plays a role in maintaining the resting potential.D. The concentration of potassium ions is much higher than the concentration of

sodium ions inside the cell.

9. How are neurons structurally adapted to transmit impulses to the next neurons?

A. Synaptic knobs contain neurotransmitter substances within synaptic vesicles.B. They have Schwann cells that surround axons.C. They have numerous nodes of Ranvier.D. They have numerous dendrites.

10. Which disorder is correctly matched with its cause?

A. Cretinism — excess thyroxineB. Diabetes mellitus — excess insulinC. Dwarfism — insufficient growth hormoneD. High blood calcium — insufficient parathyroid hormone

11. What is the role of cytotoxic T cells?

A. To activate the production of plasma cells.B. To attack specific viruses and bacteria.C. To attack infected body cells.D. To produce antibodies.


CONFIDENTIAL AS/OCT 2007/BIO250

12. A hydroskeleton mainly consists of

A. connective tissue.B. cartilage.C. bone.D. fluid.

13. The release of ions from the sarcoplasmic reticulum is required forthe contraction of skeletal muscle.

A. potassiumB. calciumC. sodiumD. iron

14. The female structure of a flower is called and it produces

A. sepal — eggsB. carpel — ovulesC. anther — sperm nucleiD. stamen — pollen grains

15. After fertilization, the develops into a seed and thedevelops into a fruit in a flowering plant.

A. egg — ovaryB. egg — ovuleC. ovule — ovaryD. embryo — flower

16. Sugar moves from leaves into the

17.

of by.

A. sieve tube elements — phloem — active transportB. sieve tube elements — phloem — diffusionC. vessel cells — xylem — active transportD. vessel cells — xylem — diffusion

The primary growth addsin a plant.

A. branches — flowersB. girth — branchesC. flowers — heightD. height — girth

. while secondary growth adds



18. Commercially, gibberellin-auxin sprays are used to

A. produce seedless varieties of fruit.B. protect plants from pathogen.C. provide nutrients to the plants.D. keep the cut flowers fresh.

19. promotes seed germination while inhibits seedgermination.

A. Auxin — cytokininB. Auxin — gibberellinC. Gibberellin — cytokininD. Gibberellin — abscisic acid

20. Which of the following will stimulate flowering in a long-day plant with a critical nightlength of 12 hours?

A. 12 hours of light, 6 hours of dark, a flash of red light, a flash of far-red light, 6hours of dark

B. 12 hours of light, 6 hours of dark, a flash of far-red light, 6 hours of darkC. 12 hours of light, 6 hours of dark, a flash of red light, 6 hours of darkD. 12 hours of light followed by 12 hours of dark



PARTB

QUESTION 1

a) What are the differences between the open and closed circulatory systems?(4 marks)

b) List any four (4) types of white blood cells and give one (1) function for each of them.(6 marks)

QUESTION 2

a) Describe the mechanism of exhalation in humans.(6 marks)

b) State four (4) characteristics of the respiratory surface in fish.(4 marks)

QUESTION 3

a) Describe the chemical digestion for carbohydrates and nucleic acids in the humansmall intestine.

(7 marks)

b) What is the main function of

i) hydrochloric acid in the stomach?(1 mark)

ii) pyloric sphincter?(1 mark)

iii) gastrin?(1 mark)

QUESTION 4

a) Draw and label the structure of a synapse.(4 marks)

b) Describe the process of impulse transmission at a synapse.(6 marks)



QUESTION 5

a) What is an antigen?(2 marks)

b) What are the roles of helper T cells in the human immune system?(4 marks)

c) Distinguish between humoral and cell mediated immune systems?(4 marks)

QUESTION 6

a) Draw a longitudinal section of a typical flower.

(4 marks)

b) Describe the formation of an embryo sac or female gametophyte in a flowering plant.

(6 marks)

QUESTION 7

a) Write short notes on hypogeal germination.

(3 marks)

b) What are the differences between the structure of a monocot and a dicot stem?

(2 marks)

c) Describe phototropism.(5 marks)

END OF QUESTION PAPER


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BIO250 (2)