THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCE BASED SECONDARY EXAMINATION SERIES

BIOLOGY 1MID TERM EXAMINATION

FORM THREE-AUG/SEPT 2021

Time: 3Hours

Instructions.

1. This paper consists of section A, B and C with a total of 15 questions.
2. Answer all questions in section A and B and TWO  (2) question from section C in which question 13 compulsory.
3. All writing should be in blue or black pen, except for diagrams that must be drawn in pencil.
4. Cellular phones and any unauthorized materials are not allowed in the examination room.
5. Write your number on every page of your answer booklet.

 SECTION A (20 Marks)

 Answer All questions in this section.

1. For each of the items (i)-(x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) A biologist discovered a new cell in a culture. The new cell had a distinct cell wall but it did not have a definite nucleus. The cell is most likely to be:

1. Fungi
2. Prokaryote 
3. Protozoa 
4. Virus 
5. Eukaryote

(ii)Oxygen debt occurs when:

1. Too much carbon dioxide is present in the body. 
2. The rate of respiration exceeds that of photosynthesis in green plants.
3. Alcohol is formed in tissues. 
4. There is insufficient oxygen in the muscle tissues during strenuous exercise. 
5. There is insufficient lactic acid in muscle tissues.

(iii) Green plants are known as producers because they:

1. produce chlorophyll in chloroplasts
2. produce green leaves
3. contain fruits and seeds
4. grow in fertile soil
5. make food from simple stibstances

(iv) Which of the following prevents surfaces of the articulating bones from being worn out by friction?

1. Capsular ligament
2. Synovial membrane
3. Articular cartilage
4. Tendon
5. Synovial capsule

(v) The best distinction between diastolic and systolic blood pressure is that:

1. Diastolic blood pressure is caused by contraction of ventricles while systolic blood pressure is caused by contraction of auricles.
2. Diastolic blood pressure causes blood from contracting auricles to flow into ventricles while systolic blood pressure causes blood from contracting ventricles to flow into pulmonary artery and aorta.
3. Diastolic blood pressure is the same as systolic blood pressure. Therefore there is no distinction.
4. Diastolic blood pressure is lower than systolic blood pressure.
5. Diastolic blood pressure is common.

(vi)In green grass there are usually large numbers of green grasshoppers than brown grasshoppers. The best explanation is that the:

1. green grasshoppers feel the need of being green to give them protection.
2. predators do not capture green grasshoppers as frequently as brown grasshoppers.
3. green grass makes the brown grasshopper not to be seen by the predators.
4. green grasshoppers obtain enough food from green grass than brown grasshopper.
5. green grass stimulates green grsshoppers to reproduce and increase in number faster than brown grasshoppers.

(vii) Why are skeletal muscles usually found in opposing pairs?

1.  One muscle alone cannot extend a joint
2.  Muscles can only work by contraction
3.  One muscle alone cannot flex a joint
4.  Paired muscles are stronger
5.  Muscles normally work in antagonistic fashion

(viii) When students were conducting private study at night, lights went off completely. Which of the following changes occurred in the eyes of the students?

1.  The lens became thicker
2.  The pupil became larger
3.  The ciliary muscle relaxed
4.  The lids close
5.  The eyes opened wider

(ix) Which hormones produced by the pituitary gland promote ovulation?

1. Follicle stimulating hormone (FSH) and lutenizing hormone (LH)
2. Lutenizing hormone (LH) and progesterone
3. Oestrogen and progesterone
4. Progesterone and follicle stimulating hormone (FSH)
5. Prolactin and progesterone

(x) A mountaineer develops headache, breathlessness, nausea and vomiting on reaching an altitude of above 4000 metres. This is because: 

1. his body system is not given time to adjust to the low oxygen pressure.
2. the atmospheric pressure as well as the supply of oxygen decreases at higher altitude.
3. the increase in the amount of oxygen results into breåthlessness.
4. the atmospheric pressure increases at higher altitude and so does the supply of oxygen.
5. his body system is not given time to relax due to the increase of atmospheric pressure.

2. Match the items in List A with the List B by writing the letter of the correct responsible beside the item number.

SECTION B (60 Marks)

Answer all questions in this section.

4. In an experiment to investigate a factor affecting photosynthesis, a potted plant which had been kept in the dark overnight was treated as shown in the diagram below and exposed to light.

(a) Why was the potted plant kept in the dark overnight? (1 mark)

(b) Which factor was being investigated in the experiment? (1 mark)

(c) (i) Which test did the students perform to con?rm photosynthesis in the leaves labelled P and Q? (1 mark)

(ii) State the results obtained in the leaves labelled P and Q.

P (1 mark)

Q (1 mark)

(iii) Explain the results obtained in the leaves labelled P and Q.

P .........................(1 mark)

Q..........................(l mark)

(d) What was the purpose of leaf Q in the experiment? (1 mark)

4.How do plants get rid of excretory products? Briefly explain three ways.

5.  Give four differences that exist between insect pollinated flowers and wind pollinated flowers.

6. (a) How could the body remove or destroy a bacterium that lands:

(i) on the cornea?

(ii) on the hand?

(iii) in the bronchus? (iv) in the stomach?

7. (a) (i) Define the term mitosis.

(ii) Outline the significance of mitosis to organisms.

8. (a) Explain the adaptation of the lungs for gaseous exchange.

(b) What is the biological importance of shivering during cold weather?

(c) Explain why some trees are killed when a ring of bark is removed from their stems.

9. Explain the effects of increased physical activity on the following organ systems:

1. Heart
2. Lung
3. Skin
4. Kidney

10.  Describe the role of hormones in the human menstrual cycle.

11. Below are diagrams of a cell organelle obtained from different organs of an animal.

(a) (i) For each organelle state an organ in the urinary system where it is likely to be found.

(ii) Give a reason for your answers in (a) (i) above (2 marks)

(b) Name the part of the chloroplast where the following reactions occur:

(i) Carbon(IV) oxide fixation(1 mark)

(ii) Photolysis (1 mark)

12. Explain the survival values of the following tropic responses to plants.

(a) Geotropism (2 marks)

(b) Phototropism. (1 mark)

SECTION C (25 Marks)

Answer two (2) questions from this section. Question 13 is compulsory.

13.   Explain the functions of the major components of the human skeleton and their adaptations.
14. Explain two differences between artificial and natural classification systems and indicate the two merits and demerits for each system..

15. (a) Differentiate between responsible behaviours and risky behaviours.

(b) State two behaviours which may lead to the following risks:

(i) STDs

(ii)HIV infections

(iii)Drug abuse

(iv)Unplanned pregnancies

(c) Suggest how victims of HIV/AIDS can be cared and supported.

THE PRESIDENT'S OFFICE

MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT

AUGUST-SEPTEMBER   EXAMINATION SERIES

BIOLOGY  FORM-3

2020

TIME: 2:30 HRS

Instructions

1. This paper consists of sections A, B and C with a total of fifteen (15) questions.
2. Answer all the questions in sections A and B and two (2) questions from section C of which question 13 is compulsory.
3. All writing should be in blue or black pen, except for diagrams that must be drawn in pencil.
4. Cellular phones and any unauthorised materials are not allowed in the examination room.
5.  Write your Examination Number on every page of your answer booklet(s).

SECTION A (15 Marks)

Answer all questions in this section.

1 For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) What is the aim of doing experiment when conducting a scientific investigation?

1.  Identifying a problem 
2.  Finding a solution 
3.  Testing a hypothesis 
4.  Gathering information 
5.  Recording results

(ii) What is the role of node of ranvier in a neurone?

1. To transmit the impulses away from the cell body.
2. To insulate the axon and speed up transmission of impulses.
3. To transmit nerve impulses from one nerve to another.
4. To speed up the transmission of nerve impulses.
5.  To transmit the nerve impulses towards the cell body.

(iii) flow many gametes are produced from one cell during meiosis?

1. Eight 
2. Two  
3. Four 
4. Six 
5. Ten.   

(iv) Which of the following is the excretory organ in human?

1. Mouth 
2. Kidney 
3. Pancreas 
4. Stomach 
5. Anus.   

(v) The function of the bright coloured petals in flowers is

1. to store nectarines 
2. to hold sepals in position 
3. to produce colour of the flower 
4. to receive pollen grain 
5. to attract insects for pollination.

(vi) The function of hydrochloric acid in food testing experiment is

1. to decolourise food sample 
2. to test reducing sugar 
3. to oxidize the food sample 
4. to neutralize sugary foods 
5. to hydrolyze complex to simple sugar.   

(vi)  Goitre is a deficiency disease caused by lack of which element in the diet?

1.  Carbohydrate 
2. Iodine 
3. Vitamin E 
4. Vitamin C
5.  Protein.

(vii) The product of anaerobic respiration process in animals is

1.  lactic acid   
2. carbondioxide  
3. alcohol
4. water  
5.  oxygen.

(viii) Which disease spread rapidly as a result of poor waste disposal?

1. Anemia
2. AIDS
3. Cholera
4. Leukemia
5. Small pox.

(x) A voluntary muscle that is capable of relaxing continuously and do not fatigue easily is known as

1.  skeletal muscle
2. biceps
3. triceps
4. cardiac muscle
5. smooth muscle. 

2. Match the responses in List B with the phrases in List   A by writing the letter of the correct response from List B beside the item number of List A in your answer booklet.

SECTION B (60 Marks)

Answer all questions in this section.

3. (a) Differentiate the term "Biological apparatus" from "Biology Laboratory".

(b) Briefly explain why the following substances are dangerous?

1. Toxic substances
2. Highly flammable
3. Corrosive substances
4. Radioactive substances.

4.  (a) State two principles of waste disposal.

(b)  Suggest three proper ways of waste disposal in the community.

5. (a) Explain the distinctive features of the Division Filicinophyta.

(b) Draw a well labeled diagram of a fern plant.

6. (a) List any two types of blood cells.

(b) Give two differences between arteries and vein.

7. (a) State three basic principles of waste disposal.

(b) Why poor waste disposal at home is said to cause adverse effects?

8. (a) Give the meaning of the following terms:

1. Vegetative propagation.
2. Gamete.

(b) Explain the merits and demerits of asexual reproduction in plants.

9. (a) Define the term “osmoregulation”.

(b) Briefly explain the mechanisms of regulating sugar level in the blood.

10. (a) Explain the functions of the vascular system in plants

(b) State three importance of transportation of materials in living things.

11.  Consider that you are a medical doctor and you have received a patient whose investigation has diagnosed kidney stones. Suggest to the patient three possible causes and three control measures for kidney stones.

12. Reptiles are organisms whose body temperature is affected by environmental temperature. Briefly explain three ways that help reptile to survive in different weather conditions.

SECTION C

13. Explain any four effects of irresponsible sexual behaviour and suggest five ways of eradicating those behaviours in the community.

14. Describe four similarities and seven differences between insect and wind pollinated flowers.

15. Write an essay on transportation in plants using the following guidelines:

1. Meaning of transportation
2. The importance of transpiration
3. The adaptation of features which enable plants to reduce water loss