The most likely mode of an organism that possesses attachment structure, thin outer surface layer and absence of an elaborate digestive tract is

A. Autotropic

B. holophytic

C. parasitic

D. saprophytic

E. symbiotic

Which one is NOT an excretory product of man?

A. carbon(iv)oxide

B. oxygen

C. nitrogenous wastes

D. salts

E. respiration

Which structure of the mammalian ear when removed will affect the maintenance of balance?

A. auditory canal

B. ear ossicles

C. pinna

D. semi-circular canals

E. tympanium

Which of the following agricultural practices will NOT promote soil conservation ?

A. afforestation

B. bush burning

C. crop rotation

D. manuring

E. mulching

The group of micro-organisms that plays a vital role in the baking industry is

A. algae

B. bacteria

C. fungi

D. protozoa

E. viruses

An instrument of measuring wind speed is called

A. an anemometer

B. a barometer

C. a hygrometer

D. a speedometer

E. a thermometer

Which of these traits shows discontinuous variation ?

A. ability to roll the tongue

B. colour of hair

C. height of stem

D. size of girth

E. weight of organism

An example of a conditioned reflex is

A. blinking of the eye-lids

B. shout of exclamation

C. knee jerk

D. riding a bicycle

E. twitching of facial muscles

Which of these is a liming factor with respect to human population size?

A. emigration

B. high standard of living

C. immigration

D. improved medicare

E. natality

An essential element whose deficiency in plants will result in poor growth, particularly of the roots, and is essential for cell well formation is

A. calcium

B. iron

C. magnesium

D. nitrogen

E. phosphorus