Reabsorption of useful materials takes place in the part labelled
- A. 1 and 3
- B. 3 and 5
- C. 5 and 6
- D. 6 and 7
- E. 2 and 4
Bowman’s capsule are located in the part labelled
- A. 1
- B. 2
- C. 3
- D. 4
- E. 5
The initial volume of water poured into 60g bag of dry soil was 50ml and the amount that drained through was 35ml. The percentage water content of the fully soaked soil is therefore
- A. 46.7
- B. 25.0
- C. 20.0
- D. 30.0
- E. 58.3
Atmospheric nitrogen is directly replenished in nature through
- A. the activities of denitrifying bacteria
- B. the breakdown of ammonium salts in the soil
- C. the activities of nitrifying bacteria
- D. the activities of nitrogen-fixing bacteria in root nodules
- E. egestion, death and decay
The origin of mineral particles in the soil is
- A. humus
- B. water
- C. micro-organisms
- D. weathered rock
- E. organic matter
Water retention is highest in soils which are rich in
- A. sand, poor in humus and devoid of clay
- B. clay and sand, but poor in humus
- C. clay and humus, but poor in sand
- D. clay, poor in humus and devoid of sand
- E. sand and humus, but poor in clay
Soil erosion CANNOT be controlled by
- A. planting cover crops
- B. contouring of sloping ground
- C. terracing of slopes
- D. laying of mulch
- E. burning of bush
Tsetse fly is harmful to man because it is associated with the spread of
- A. river blindness
- B. malaria
- C. sleeping sickness
- D. leprosy
- E. dysentry
Which of the following is NOT caused by bacteria?
- A. Cholera
- B. Gonorrhoea
- C. Tuberculosis
- D. Onchoceriasis
- E. Typhoid
The primary and secondary hosts respectively of bilharzia are
- A. fish and man
- B. man and dog
- C. man and snail
- D. fish and snail
Which of the following food chains is in the correct sequence?
- A. Weeds → Tadpole → Beetles → Fish → Man
- B. Weeds → Tadpole → Fish → Beetles → Man
- C. Tadpole → Beetles →Weeds → Man → Fish
- D. Man → Fish → Beetles → Tadpole → Weeds
- E. Fish → Beetles → Weeds → Man → Tadpoles
A relationship between living organisms which is of mutual benefit is
- A. parasitism
- B. saprophtism
- C. ecosystem
- D. symbiosis
- E. commensalism
In mammals, stimulus is transferred from the receptor muscles to the central nervous system through the
- A. motor neurons
- B. effector muscles
- C. dendrites
- D. sensory neurons
- E. synapses
An old man is likely to be long-sighted because age affects the
- A. optic nerves
- B. retina
- C. ciliary muscles
- D. cornea
- E. aqueous humour
The mammalian endocrine system is responsible for?
- A. transmitting impulse
- B. regulating body temperature
- C. regulating osmotic pressure of blood
- D. chemical co-ordination
- E. the manufacture of blood
Germination which results in the cotyledons being brought above ground is called
- A. hypocotyl
- B. epicotyl
- C. epigeal
- D. hypogeal
- E. plumule
A young plant showing yellow leaves is likely NOT to be deficient in?
- A. calcium
- B. magnesium
- C. potassium
- D. boron
The hereditary material in a cell is known as
- A. ADP
- B. CNS
- C. RNA
- D. ATP
- E. DNA
The characters by which an organism is recognized are termed its
- A. phenotype
- B. genotype
- C. morphology
- D. anatomy
- E. physiology
Irish potato is a
- A. bulb
- B. tap root
- C. rhizome
- D. root tuber
- E. stem tuber
For pollen to be released in Crotalaria the insect must depress the
- A. wing
- B. keel
- C. standard
- D. antepetalous stamen
- E. antesepalous stamen