INSTRUCTIONS TO CANDIDATES
- Write your name, Admission number and name of your school in the spaces provided above
- Sign and write the date of examination in the spaces provided.
- Answer all the questions in the spaces provided.
- This paper consists of 8 printed pages.
- Candidates should check to ascertain that all pages are printed as indicated and that no questions are missing
FOR EXAMINERS USE ONLY
Question |
Maximum score |
Candidate’s score |
1-26 | 80 |
QUESTIONS
-
- Name the causative agents of the following diseases in humans.
- Typhoid. (1mk)
- Amoebic dysentery. (1mk)
- Name the causative agents of the following diseases in humans.
- State the function of the following cell organelles.
- Ribosome. (1mk)
- Lysosomes (1mk)
- Nucleolus. (1mk)
-
- Name one defect of the circulatory system in humans. (1mk)
- State three functions of blood other than transport. (3mks)
-
- Distinguish between epigael and hypogeal germination in plants. (2mks)
- Name the gland that secretes the following hormones. (2mks)
- Ecdysone
- Juvenile
-
- Give two sex linked genes found on the Y-chromosome. (2mks)
- Below is a nucleotide strand
A
A
G
T
C
- Identify the type of nucleic acid. (1mk)
- Give a reason for your answer in (a) above. (1mk)
-
- Distinguish between homologous and analogous structures. (2mks)
- Give one reason why organisms become resistant to drugs. (1mk)
- The following specimen was extracted from a newly discovered organism.
- Name the tooth labeled M. (1mk)
- Name the part labeled Q and state its role. (2mks)
Name………………………………………………..…………………….
Role……………………………………………………………………………………………………….
- The diagram below represents a cell organelle
- Name the part labeled Y. (1mk)
- State the function of the part labeled X. (1mk)
- Explain how dark stage of photosynthesis is dependent on the light stage. (2mks)
-
- Name two gaseous exchange surfaces in plants. (2mks)
- What is the importance counter current flow system in fish? (2mks)
- Form three students wanted to estimate the population in 5km2 grass field near a school compound. They captured 36 grass hoppers and marked them before returning them to the field. After a few days they made another catch of grasshoppers. They collected 45 grasshoppers out of which only 4 had marks.
- Name the method of population estimation the students used. (1mk)
- State two assumptions that were made by the students during the study. (2mks)
- From the data, calculate the population size of grasshopper. (2mks)
- State the functions of the following parts. (2mks)
-
- Endometrium
- Epididymis
- What mechanism facilities the movement of the ovum towards uterus. (1mk)
-
- The diagram below represents the flow of energy in a food chain.
Sun → Grass → Antelope → Leopard → Bacteria → P- Suggest a reason why the energy labeled P does not enter food chain (1mk)
- State one way in which energy is lost from the food chain. (1mk)
- The diagram below represents the cross section of a part of a certain plant.
- Name the class of the plant from which the section was taken. (1mk)
- Give a reason for your answer in a) above. (1mk)
- Name the parts labeled A and B. (2mks)
- State two reasons why the study of biology is important. (2mks)
- State the economic importance of the following plants excretory procedures. (3mks)
- Caffeine
- Quinine
- Colchicine
- Define the following terms
- Irritability (1mk)
- Stimulus (1mk)
- A process that occurs in plants is replaced by the equation below
C6H12O6 → 2C2H5OH+ CO2 + Energy- Name the process. (1mk)
- State the importance of the process named in a) above. (2mks)
-
- What is Binomial Nomenclature? (1mk)
- State two rules that are followed when printing scientific names. (2mks)
- Name three strengthening tissues in dicolyledonous plants. (3mks)
- Name the site for gaseous exchange in insects. (1mk)
-
- What is alternation of generations (2mks)
- Explain why leaves of Peridophytes are referred to as Fronds. (1mk)
- State four adaptations of red blood cells to its functions. (4mks)
- The experiment illustrated below was set up to investigate a certain physiological process
- Name the physiological process that was being investigated. (1mk)
- State the observations that were made after at the end of the experiment
- Inside the Visking tubing (1mk)
- Outside the Visking tubing (1mk)
- Account for the observations in b) above. (2mks)
- State the differences between the following structures in wind and insect pollinated flowers. (3mks)
- Anther
- Pollen grains
- Stigma
wind pollinated insect pollinated flower
- A student placed a drop of pond water in a cavity slide and observed it under the microscope. The student observed many fast moving organisms, one of which is represented in the diagram below.
- Name the kingdom to which the organism belongs. (1mk)
- Name the structures labeled P and N (2mks)
P………………………………………………………..
N………………………………………………………...
- A person was found to pass out large volumes of dilute urine frequently. Name the;
- Disease the person was suffering from (1mk)
- Hormone that was deficient (1mk)
MARKING SCHEME
Q1
-
- Salmonellatyphi
- Entamoebahistolytica
Rej/f rule of binomial nomenclature not followed
Q2
- Site for protein synthesis;
- Destroys worn out organelles;
- Synthesis of ribosomes;
Q3
- Haemophilia; anaemia
- Fight disease causing organisms (Defence)
Blood clotting
Distribution of heat
Q4
- Epigeal
A type of germination where by the cotyledons are brought above the soil surface.
Hypogeal
A type of germination where by the cotyledons remain underground -
- Prothoracic gland;
- Corpora allata;
Q5
- –Tuft of hair on nose and ear;
-Premature baldness
Rej porcupine man -
- DNA/Deoxyribonucleic acid
- Presence of thymine base;
Q6
- Homologous structures- structures in organisms having same embryonic origin but performing different function
- - Mutation produces mutants that are resistant to drugs.
- Produce lytic enzymes that breakdown drugs.
Q7
- Stomata
- Contain chlorophyll pigment that traps light energy for photosynthesis;
- Requires ATP; from light stage
Requires Hydrogen Ions; (H+) (OWTTE)
Q9
- Stomata; Epidermis; (young plants)
Lenticels; Aerenchymatisues;
Pneumatophores;
Cuticle (first 2 only) - Creates a steep concentration gradient; for maximum gaseous exchange;
Q10
- Capture-recapture;
- Enough time allowed for grasshoppers to randomly mix;
The marking does not affect the animals behavior;
No migration or immigration; - Population=First capture x second capture
Marked recapture
= 36 × 45;
4
= 405 grasshoppers
Q 11
-
- Site for implantation;
- Storage of sperms
- Contraction and relaxation of smooth muscles of walls of fallopian tube;
Cilia waft the ovum towards the uterus.
Q 12
The energy is lost through radiation into the atmosphere
Some of the energy is absorbed by land and water surfaces
Q 13
- Monocotyledon
- Vascular bundles are scattered in the cortex
- A-Epidermis
B -Phloem
Q 14
- Cared subject
- Solving environmental problems
- Acquisition of Scientific skills
- Research tool/international cooperation
Q 15
- Mild stimulant
- Treatment of malaria Rej antibiotic
- Plant and animal breeding
Q 16
- Ability of an organism to detect/perceive and respond appropriately to a stimulus
- A change in an environment factor.
Q 17
- Alcoholic fermentation/anaerobic respiration;
- Used in Beer/wine/alcoholic beverage industry;
Used in Bread Baking
Making of composed manure
Production of Biogas (Mark any two correct answers)
Q 18
- Scientific system of giving two names (Genus and species name) to an organism;
Acc Rule of double naming of organism. - Genus name must be in small letters;
The names should be (printed) in italics;
Q 19
- Sclerenchyma;
- Collenchyma;
- Xylem (tissues) (Acc xylem vessels and iracheds)
Q 20
- Tracheoles; rej Tracheal
Q 21
- Where a plant goes through two generations sporophyte (spore producing stage) and gametophyte (gamete producing stage) stage to complete its life cycle;
- They perform both photosynthetic and reproductive functions;
Q 22
- Biconcave in shape to increase the surface area for gaseous exchange;
- Absence of nucleus to create more space for packing of haemoglobin;
- Thin membrane for rapid diffusion of gases;
- Presence of carbonic Anhydrase for loading of Carbon (IV)
- Presence of Haemoglobine that has a high affinity for oxygen;
- Flexible/pliable to squeeze through the narrow blood capillaries (mark 1st 2)
Q 23
- Diffusion
-
- Blue black colour observed
- Brown/yellow colour Iodine/Acccolour of Iodine Persist;
- Iodine molecules being smaller diffuse from the beaker to the Visking tubing;
Starch molecules being too large do not diffuse out of the Visking tubing into the beaker;
Q 24
Wind Pollination Insect Pollination
- Anther hang outside the flower Found inside the flower
- Pollen grains small/light/smooth Large/hairy/heavy
- Stigma large and feathering Small and sticky
Q 25
- Protoctista;
- P- Cilliumrej cilia
N- Contractile vacuole
Q 26
a) Diabetes Inspidus
b) Antiduiretic Hormone/Vasopressin;
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