(a) what is an ecosystem?
(b) Name twi abiotic factors each which affect plants and animals in a terrestrial habitat
(c) Describe the effect of three abiotic factors pn a named plants and an animal in the habitat mentioned in (b) above
(a)(i) Define tropic and nastic movements.
(ii) List four differences between tropic and nastic movements.
(b) Describe an experiment to show that auxins are produced in the apical cells of a shoot.
(c)(i) Name two plant hormones, other than auxins.
(ii) Give two examples of tropism.
(a) State eight human activities that may pollute water bodies
(b) Explain the measures that may be used to prevent pollution of water bodies.
(c) Mention four methods of purifying water.
(a)(i) Draw and label.the mammalian heart.
(ii) Explain briefly pulmonary circulation in mammals.
(b) State five processes by which the mammalian body reduces its temperature.
(i) Draw and label the human sperm cell.
(ii) State where the sperm cell is produced and where it is stored.
(b) Explain how the structure of the sperm cell enables it to function
(c) Mention four advantages of sexual reproduction.
Which of the following animals exhibits territoriality?
- A. Bees
- B. Bats
- C. Lizards
- D. Rabbit
The character that expresses itself in the presence of the contrasting characters
- A. hybrid
- B. allele
- C. recessive
- D. dominant
Which of the following variations is applicable to a weight lifter?
- A. Continuous variation
- B. Discontinuous variation
- C. Hereditary variation
- D. Acquired variation
Use the human characteristics to answer this question.
i. Complexion ii. Height iii. Blood Rh factor iv. Colour blindess
Which of the characteristics can be expressed phenotypically?
- A. I and II only
- B. I, II and IV only
- C. I, III and IV only
- D. I, II and III only
I. Complexion II. Height III. Blood Rh factor IV. Colour blindness
Which of the above human characteristics are discontinuous variations?
- A. I and III only
- B. II and III only
- C. II and IV only
- D. III and IV only
In medicine, bacteria have proved very useful due to the production of
- A. nitrate
- B. antibiotics
- C. cured tobacco
- D. tanned leather
Fresh milk is often kept in refrigerated vehicles, for distribution to customers in order to
- A. ensure proper share of fresh milk to all customers.
- B. ensure delivery of milk to customers in good time
- C. improve the quality of the milk
- D. ensure that the milk is presented for a longer period
Which of these is a vector of malaria fever?
- A. Female anopheles mosquito
- B. Male anopheles mosquito
- C. Female culex mosquito
- D. Male culex mosquito
Which of these is not correct about the tse-tsefly and mosquito? They
- A. harbour protozoa as disease agents
- B. possess piercing and sucking mouth parts
- C. have intermediate hosts
- D. inject disease- causing organisms into the blood stream
Which of the following structures in a housefly aids in the transmission of diseases in man?
- A. Hairs
- B. Spiracles
- C. Antennae
- D. Wings
Which of the following groups of factors do the Agama lizards compete for? I. Space II. Food III. Mates
- A. Space and food only
- B. Space and mates only
- C. Food and mates only
- D. Space, food and mates
Which of the following associations can upset the balance of nature?
- A. Epiphitism
- B. Parasitism
- C. Symbiosis
- D. Saprophytism
The substances recycled in the soil by the activities of micro-organisms during the decay of dead organisms
are first utilized by the
- A. carnivores
- B. herbivores
- C. scavengers
- D. autotrophs
Micro-organisms which break down dead organisms and absorb their contents are called
- A. decomposers
- B. consumers
- C. parasites
- D. commensals
Which of the following is not promoted by high wind speed?
- A. Rill erosion
- B. Weathering of parent rock
- C. Breeding of plant
- D. Opening of stomata
Which of the following solutions is suitable for removing chlorophyll in a green leaf?
- A. Million’s reagent
- B. Methylated spirit
- C. Benedict solution
- D. Fehling’s solution