REPUBLIC OF DISTRICT COMPREHENSIVE EXAMINATION Date:
RWANDA 26/03/ 2025
SECOND TERM
Duration: 3h
SCHOOL YEAR: 2024/2025 Max:
SUBJECT: Biology & Health sciences 100 Marks
LEVEL: Ordinary Level
WESTERN
INSTRUCTIONS : Class: Senior one
PROVINCE
RUBAVU
This DISTRICT
paper consists of three sections A and B
Section A: Attempt all questions (55 marks)
Section B: Attempt only 3 questions (45 marks)
SECTION A: Attempt all questions/55marks
Q1. Define the following terms /8marks
a. Biology
b. Taxonomy
c. Balanced diet
d. Respiration
Q2. Which of the following parts of a cell controls all activities? /2marks
a) Nucleus.
b) Cell wall.
c) Cell membrane.
d) Mitochondria.
Q3. In phototropism, the term “photo” means: /2marks
a) Chemical.
b) Grow of shoot.
c) Light.
d) Water.
Q4. Dicotyledonous leaves have: /2marks
a) Network venation.
b) Zigzag venation.
c) Parallel venation.
d) Horizontal venation.
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Q5. The following are levels of organization in multicellular organisms. Which one of the
following represents the correct sequence from simplest to the most complex? /2marks
a) Nucleus, organism, tissue, cell, organ, system.
b) Nucleus, Cell, Tissue, Organ, System, Organism.
c) Organism, cell, system, tissue, Nucleus, and organ.
d) Tissue, Cell, System, Nucleus, Organ, and Organism.
Q6. Differentiate Endoskeleton and Exoskeleton /2marks
Give an example of animal for each case /2marks
Give the functions of the skeleton /3marks
Q7 The plant growth towards or away from the stimulus is called: /2marks
a) Tropism.
b) Touch.
c) Sensitivity.
d) Growth response.
Q8. The following are branches of biology: zoology, botany, anatomy, physiology,
nutrition, heredity and ecology. Which branch or branches can be studied /5marks
by a student who wants to be:
a) medical doctor and a surgeon
b) A food scientist
c) Forensic scientist
d) Agriculture researcher
e) An environmentalist
Q9. Here are some of the main types of chemical substances we need in our diet. /4marks
1) Carbohydrates
2) Proteins
3) Water
4) Fats
Match them up with the following functions they do in our bodies.
a) Make up most of the mass of our bodies
b) Heat insulation in the skin
c) Main source of energy in respiration
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d) Needed for growth and repair of cells and tissues.
Q11. A student wrote a scientific name of a human being as homo Sapiens.
a) Identify three mistakes made by the student. /3marks
b) Rewrite the scientific name above to correct the mistake /2marks
c) To which genus does a human being belong? Give a reason to support your /2marks
Q12. Answer by true or false on each statement. /8marks
a) The respiratory tract in humans is lined with cilia.
b) Alveoli are also referred to as air sacs.
c) Gills are parts of human respiratory system.
d) The trachea branches to form two bronchi each connect to the lung.
e) Bronchioles are tiny tubes which connect to alveoli.
f) Smoking is harmful to our health.
g) Tuberculosis (TB) is not respiratory disease.
h) Nutrition is a process by which living organisms obtain nutrients for: provision of energy, growth,
repair protection and maintenance.
i) All organisms move from one place to another.
Q13. Match the organelles in Column A with the correct Function in Column B /6marks
Column A Column B
A. Nucleus 1. Living, jelly-like fluid in which reactions take place inside the cell
B. Mitochondria 2. Control Centre of the cell
C. Cell wall 3. Controls what goes in and out of the cell
D. Cell membrane 4. Produce energy
E. chloroplast 5. Photosynthesis takes place
F. cytoplasm 6. The rigid structure on the outside of plant cells that keeps the
shape of the cell
SECTION B( attempt three questions)
Q14. A health worker recorded the number of children at the health centre that suffered from nutritional
disorders over three months. His/her results are shown in the table below.
Nutritional disorder October November December
Rickets 5 4 6
Kwashiorkor 1 3 1
Anemia 6 3 4
a) How many children in total had kwashiorkor? /2marks
b) In which month were the most children with anemia? /1mark
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c) Children with anemia are required to eat particular foods for their improvement.
Which kind of foods would you recommend them? Give four examples. /6marks
d) Which vitamin and mineral should children with rickets eat more of in their diet? /2marks
e) Apart from the nutritional disorders identified in the above table, suggest any
other four examples in humans. /4marks
Q15. a. Arrange the structures in the correct order starting with the smallest: /3marks
Organ, tissue, cell, organism, organ system, Organelle
b. which of them can be applied to the following: /4marks
i. Cat
ii. Ovum
iii. Leaf
iv. Chloroplast
c. Copy this table and complete it /8marks
Plant cell Animal cell
Shape
Outer covering
Organelles
Vacuoles
Q16. a. Match each food listed with the food nutrient it is rich in.
/6marks
Food substance Chemical Nutrient
a. Cassava 1. Proteins
b. Lean meat 2. Vitamis
c. Sugar cane 3. Starch
d. Cabbage 4. Lipid
e. bones 5. sucrose
f. butter 6. phosphorus
b. Describe the different types of Carbohydrates, giving example for each type /9marks
Q17. a. Drow well labelled diagram of external structure of the flower /10marks
b. Why do you need flowering plants in your school compound? /5marks
Q18 a. What is infectious diseases /2marks
b. What is causal agent of Malaria /1mark
c. what transmit Malaria /1mark
d. state the symptoms of Malaria /5marks
e. how can you eradicate(prevent) Malaria in your community /6marks
END
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