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BIOLOGY PRACTICAL QUESTIONS – KAKAMEGA CENTRAL DISTRICT
Each candidate will require the following:-
- Solution V- sucrose laboratory chemicals
- Solution W – Glucose
- Means of heating
- 2 test tubes
- Benedicts solution (10mls)
- Dilute HCl (5mls)
- Sodium hydrogen carbonate solution
- Access to water
- A dropper
- Measuring cylinder (to measure 10mls)
1. a) Identify solutions V and W by carrying out the food tests as indicated in the table below
b) Which of the two solutions V and W would you recommend for a person who needs an
immediate source of energy? Give a reason for your answer.
2. The following is a diagrammatic representation of a dissection of a rabbit showing the
urinogenital system
a) In the table below, name the structures labeled P, Q, S and T. For each of the structures,
state one function
b) i) Identify the sex of the rabbit that was dissected
ii) Give two reasons for your answer in b(i) above
c) Name the instrument labeled x in the diagram above
3. Study the photographs below and use them to answer the questions that follow;
a) Using the number of flowers arising from the shoot of each plant, state the flowers
labelled A1 and B1
b) Name the class of the plant from which each of the flowers was obtained. Give a reason
for your answer in each case :
c) Name the parts labelled S and T
d) What type of ovary is shown in flower B1? Give a reason for your answer.
e) i) Name the agent responsible for the process represented by the arrow labelled
R in B2
ii) Give a reason for your answer in e (i) above
iii) List two other features (not shown in the photograph) expected of such flowers as B1
f) i) Name an agent that brings about a similar process as the one shown by the
arrow in B2 for
A1
ii) Give a reason for your answer in f(i) above.
g) What is the likely agent of dispersal of the specimen labelled B2?
KAKAMEGA CENTRAL DISTRICT BIOLOGY PRACTICAL MARKING SCHEME (ANSWERS)
1. (a)
Food substance | Solution | Procedure | Observation | Conclusion |
Reducing sugar | V | To 1 ml of food substance add 1 ml of benedicts solution. Place in a warm/ hot water bath/ heat boil; | Blue colour retained; | Reducing sugar absent; |
W | Blue- green –yellow- orange; Acc – brown – final colour | Reducing sugar present | ||
Non- reducing sugar | V | To 1 ml of food substance add 3 drops of dilute hydrochloric acid. Boil cool add sodium hydrogen carbonate till fizzing stops. Add 1 ml of Benedicts solution and place in a warm/ hot water both/ heat/ boil | Blue- green yellow- orange
Acc- final colour only – brown – Reject brick red | Non reducing sugar present; |
W | Blue colour retained; | Non-reducing sugar absent |
b) Solution W;
Reason – it is a reducing sugar that is absorbed directly and used in respiration to produce
energy
2. a)
Structure | Name | Function |
P | Ureter | Transports urine from kidney to urinary bladder |
Q | Ovary | Oogenesis/ formation and release of ova i.e. ovulation |
S | Fallopian tube/ oviduct | Passage of ova |
T | Uterus | Pregnancy ACC implantation/ development of the embryo |
b) i) Female;
ii) – Has ovaries/ oviducts
– Has uterus
– has a vestibule
– has a clitoris
c) Dissecting pin;
3. a) A1 – solitary
B1 – Inflorescence
b)
c) S – Petal
T- Sepal, Accept Calyx
d) Type – superior;
Reason – above receptacle;
e) i) Wind;
ii) Feathery stigma; (to increase surface area for trapping pollen grains from the air)
iii) Small, light pollen grains
– Flower not scented;
– Inconspicuous flower; Mark first 2
f) i) Insects
ii) Tubular/ bell shaped corolla
Accept large petals
g) Animal;
