🌊PAPER 43-Qns

 

O-STUDY LIBRARY

BIOLOGY FORM THREE

ANNUAL EXAMINATIONS- 2023

TIME: 2:30 HRS

INSTRUCTIONS:

1. This paper consists of section A, B and C with a total of eleven (11) questions

2. Answer all questions in section A and B and two (2) questions from section C.

3. Section A carries sixteen (16) marks, section B carries fifty four (54) marks and section C carries thirty (30) marks.

4. All writings must be in blue or black ink except drawings which should be in pencil.

5. All communication devices, programmable calculators and any unauthorized materials are not allowed in the examination room.

6. Write your examination number on every page of your answer sheet(s).

SECTION A (16 MARKS)

1. For each of the following items (i) – (x) Choose the most correct answer from among the alternatives given.

i.After visiting Tarangire National parks, Peter saw organisms which had similar feeding habits.What term can be used to describe this organism?

1. Community

2. Trophic level

3. Food chain

4. Food web

5. Habitat

ii.Monica found an Organism shaped like an umbrella in a damping site. Which statement is true about organisms?

1. It is a mushroom and belongs to phylum Ascomycota

2. It is yeast and belongs to phylum Basidiomycota

3. It is mushroom and belongs to phylum Basidiomycota

4. It is Mucor and belongs to phylum Ascomycota

5. It is Yeast and belongs to phylum Ascomycota.

iii.David, A bus driver was preparing items for his first Aid Kit Which one did she not include?

1. A pair of scissors

2. Touch

3. Sterilized cotton wool

4. Amoxicillin Tablets

iv.Juma ate a meal consisting of protein. Where did the digestion of the meal begin?

1. Mouth

2. Duodenum

3. Stomach

4. Small intestine

5. Ileum

v.During an investigation a form II student put a piece of bread in a wet cupboard, after a few days the bread was covered with a grayish substance. What is the name of the substance?

1. Penicillium

2. Rhizopus stolonifer

3. Entamoeba histolytica

4. Agaricus campestris

5. Saccharomyces cerevisiae

vi.In a motor car accident the bus driver found that he could hardly maintain equilibrium,which of the structures was damaged?

1. Semicircular canal

2. Fore brain

3. Medulla Oblongata

4. Eustachian Tube

5. The cochlea

vii.Dr. Nambena received medical results from the laboratory and identified that the victim suffered from filicidal woman infection. Which of the following disease is typical caused

by above worms?

1. Lymphoma

2. Elephantiasis

3. Oedema

4. Thrombosis

5. Arteriosclerosis

viii.The glomerular filtrate contains the following materials

1. Glucose molecules, water, urea and dissolved mineral salt

2. Cells, protein and glucose

3. Uric acid, proteins and urea

4. Vitamin, urea and water

5. Mineral salts, proteins and glucose

ix.The part of ear which convert sound signals into nerve impulse which are transmitted to brain include

1. Ear Ossicles

2. Semicircular canal

3. Cochlea

4. Eustachian Tube

5. Eardrum

x.The part of compound Microscope which help to concentrate light into beams to

1. Ocular tube

2. Condenser

3. Mirror

4. Revolving nosepiece

5. Diaphragm

Qns	i	ii	iii	iv	v	vi	vii	viii	ix	x
Ans

2. Match items from LIST A with the correct phrase in LIST B by writing the letter of correct response from LIST B against item number in LIST A.

LIST A

LIST B

Muscles Smooth Muscles Cardiac muscles Skeletal Muscles Tendon Ligament

Have no ability to relax and contract Biceps and Triceps muscle Smooth muscles with disc between cells Space between bone and bone Contractile tissue specialized for relaxation and contraction to bring about movement and locomotion Muscles made up of long fibers that cover bones Muscles made up of long tapered and cells found in most of internal organs Connective tissue which attach muscles to bones Fibers tissue that join bone to bone Muscles that are able to contract without suffering fatigue and not under the influence of the Nervous system.

LIST A	i	ii	iii	iv	v	vi
LIST B

SECTION B (54 MARKS)

Answer all questions in this section

3. (a)Give three factors that Aid in Ultrafiltration in the glomerulus

(b)Give explanation of the following

1. Plasma proteins are absent in glomerular filtrate

2. Urine of a normal person does not have glucose

3. During cold days one produces large quantities of dilute Urine

(c) State 3 adaptation of convoluted tubule to re-absorption

4. (a)State any three adaptations of the leaf to photosynthesis

(b)How do the following factors affect rate of photosynthesis

1. Chlorophyll

2. Sunlight

3. Carbon dioxide

5. (a) During cooking a cook unfortunately touched a hot charcoal burner. He pulled in hand abruptly.

1. What is the name of that response

2. What is the name given to pathway which describe response in 8a(i) above

(b) Illustrate the pathway of an impulse from the sense organs to effectors of the cooks’ hand

6. Juma visited Mikumi National park and saw the following organisms: Zebra, giraffe, lion grasses, Mushrooms, hyena and antelope.

1. Construct two (2) food chains from organism observed in the National park

2. Construct a simple food web

3. Identify organism which are

1. Producer

2. Secondary consumer

3. Decomposer

7. (a)Draw a diagram of a maize cell and label the parts responsible for the following functions.

1. Control all activities of cell

2. Provide shape of the cell

3. Chemical reaction occur here

(b)How is maize cell different from cell of a goat?

8. (a)A flower was found to have conspicuous petals scented and firmly held stigma and anthers

1. What is the likely agent of pollination of the flower?

2. What is the significance of firm held stigma in the flower?

(b)Briefly explain the rule the following structures in flowers

1. Petal

2. Stigma

3. Ovary

4. Style

5. Anther

SECTION C (30 MARKS)

Answer two (2) questions in this section

9. (a)Explain why

1. .The rate of breathing increase quickly during exercise

2. Is better to breathe through nose than through mouth

(b)How are respiratory surfaces adapted to their role?

10. Many people believe that fungi are harmful organisms. As biologist, explain six ways in which fungi are beneficial to humans

11. Humans in their daily life come into contamination with viruses, bacteria, worms, and other pathogens and explain any six ways used by humans to prevent invasion and infections by disease causing microorganisms.

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