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2015 KCSE Starehe Boys Centre Mock

Biology Paper 1

Answer all questions

Name two structures used for gas exchange in terrestrial plants.

2 marks


Other than Animalia, name one other kingdom comprising organisms in which carbohydrate is stored in form of glycogen.

1 marks


Name the organism that causes malaria.

1 marks


What is the function of the valves in the mammalian heart? What is the function of the valves in the mammalian heart?

1 marks


Give the relationship between atmospheric air pressure and altitude.

2 marks


State two changes that take place when an animal undergoes hibernation

2 marks


Work out the respiratory quotient for the respiration of the chemical substance in the equation below.

2 marks


Define special creation theory.

1 marks


List any two vestigial structures in man

3 marks


Name each of the following

(a)the material secreted by sebaceous glands (1 mark)

(b)the enzyme produced in the mouth, in man (1 mark)

(c)the enzyme produced in the stomach, in man (1 mark)

(d)branch of biology dealing with the study of the morphology and physiology of blood, the blood forming organs, diseases of blood and work of the blood bank (1 mark)

(e)the homogametic sex, in man (1 mark)

5 marks


Spirogyrawas observed to produce oxygen gas molecules adhering as bubbles between the tangled filaments of the organism. Identify the characteristic of living things exemplified by this feature of Spirogyra.

1 marks


Arrange the following in ascending order:

Community, Population, Biosphere, Ecosystem

1 marks


In making an analogy of a model of a protein molecule, a biology teacher held up a necklace of beads to her class. In this analogy, what does each of the following represent?

(a)The beads? (1 mark)

(b)The string joining the beads? (1 mark)

2 marks


(a) What is the basic unit of a deoxyribonucleic acid molecule? (1 mark)

(b)List the components of the unit named in (a) above (3 marks)

4 marks


Give one structural and one physiological function of the xylem tissue: (2 marks)



2 marks


In which two ways does active transport differ from osmosis?

2 marks


(a) Define the term appendage as used with reference to arthropods (1 mark)

(b)Name any two appendages in arthropods (2 marks)

3 marks


Complete the table below, which relates to the material that makes up the cell wall of organisms in the specified taxonomic groups.

Taxonomic groupPlantaeMonera
Material of cell wall__

2 marks


The solubility in water of uric acid and ammonia at 20oC is as indicated below

Uric acid 00.006g/ 100ml
Ammonia 31.000g/ 100ml

Based on the figures above, give reason why desert animals excrete nitrogen in form of uric acid rather than in form of ammonia.

2 marks


In mammals, erythrocytes have no mitochondria while each livercell has upwards of 2 000 of these cell organelles. Explain

2 marks


In an investigation to estimate the number of Minnows (Rastrinoebola argentea) in a small pond, 625 Minnows were netted, marked and released. One week later 873 Minnows were netted and of these, 129 had been marked. What was the estimated size of the population of these organisms?

3 marks


Artificial insemination is a breeding technique used to improve or perpetuate specific genetic traits. It involves collection of semen from a male animal and its deposition into the reproductive tract of a female animal. The technique makes it possible for controlled breeding and increases the male : female ratio from 1:10 to 1:40-50. Explain this change in the male : female ratio

1 marks


(a) Give reason why small droplets of fat get broken down by enzymes more quickly than large fat
droplets (1 mark)

(b) Name:

(i)the biological phenomenon alluded to in (a) above (1 mark)

(ii)the material, in the mammalian body, responsible for the phenomenon in (a) above
(1 mark)

3 marks


Illustrated in the diagram below is an instrument used in ecological studies

(i)Identify the instrument in the diagram above (1 mark)

(ii)State the use of the instrument in the diagram above (1 mark)

2 marks


In a certain variety of pea (Pisum sativum)plants, the gene for yellow-coloured flowers is dominant to the gene for white-coloured flowers.

(a)Write down the possible genotypes of a yellow-flowered pea plant. (Use letter E to represent the gene for yellow flower colour) (2 marks)

(b)How can a yellow-flowered pea plant be confirmed to be heterozygous? (1 mark)

3 marks


The diagram below represents two states of a blood vessel in the human skin under two different environment conditions.

(a)Identify the processes marked A and B (2 marks)

(b)Specify the environment condition that would make the blood vessel undergo the process marked A. (1 mark)

3 marks


(a) Define biodegradation (1mark)

(b) Study the data in the table below, which relates to the approximated time for compounds to biodegrade in a marine environment (1 mark)

MaterialTime to biodegrade
Paper towels2 – 4 weeks
Cardboard box2 months
Plastic coated milk carton5 years
Plastic bags10 – 20 years

From the table above, identify the material that is

(i)least biodegradable

(ii)most biodegradable

2 marks


While observing an animal cell under an electron microscope, a researcher observed the organelles shown below. Identify each of the organelles

4 marks


Shown below is the drawing of a plant root tip:

(a)Identify the parts labelled X and Y (2 marks)

(b)State two functions of the structures labelled X (2 marks)

4 marks


Illustrated below is the diagram of a mature garden pea (Pisum sativum) fruit:

(a)This is a ……………………………………………….……… view of the specimen (1 mark)

(b)Name the parts marked 1 and 4 (2 marks)

(c)Name the type of fruit illustrated above (1 mark)

4 marks


State one structural difference between microvilli and intestinal villi.

1 marks


Give two possible meanings of the term translocation as used in biology.

2 marks


(a) Millipedes have an exoskeleton, a hard and tough structure yet these animals spend most of
their time in moist environments. Explain this apparent contradiction (2 marks)

(b)Plants manufacture food through photosynthesis- a process that uses light energy and carbon(IV)oxide yet in some plants stomata open only during the night and remain closed during the day. Explain this apparent contradiction (2 marks)

4 marks


(a)Study the diagram of a germinating oat seedling illustrated below. Give the term used to describe the type of germination illustrated by the plant in the diagram above. (1 mark)

(b)Explain your answer in (a) above . (1 mark)

2 marks


Illustrated below are abnormalities that may take place during gamete formation in humans. Study the illustrations carefully and answer the questions that follow:

In this illustration, the gametes formed are marked 1, 2, 3 and 4 in the female and 5, 6, 7 and 8 in the male

(a)Identify the phenomenon marked P1 in the illustration above . (1 mark)

(b)Specify the ploidy condition of the zygote formed from fusion between the gametes marked 2 and 8. (1 mark)

2 marks


Shown below is the diagram of Notonecta glauca, an aquatic arthropod:


(i) State the arthropod class to which Notonecta glauca belongs (1 mark)

(ii)State one feature, observable in the diagram above, you used in identifying the arthropod class in (a)(i) above (1 mark)

(b)Given that the specimentube shown in the diagram above is 23.6mm deep and weighs 33g, determine the actual sizeof the arthropod and hence work out the magnification of the diagram above (2 marks)

4 marks

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