Biology Past Questions And Answers
A virus can sometimes be regarded as a living organism because it
- A. causes disease in plants and animals
- B. exists in a variety of shapes
- C. reproduces in living cells
- D. is easily visible with the aid of an electron microscope
Which of the following growth activities in plants is brought about by gibberellins?
- A. Rapid cell division
- B. Tropic response
- C. Cell elongation
- D. Main cell elongation
The part of the ear which equalizes air pressure on either side of the eardrum is the?
- A. auditory meatus
- B. malleus
- C. Eustachian tube
- D. oval window
Which of the following is an excretory product of Amoeba?
- A. Urea
- B. Ammonia
- C. Uric acid
- D. Amino acid
Unicellular organisms transport essential nutrients directly to all parts of their bodies by the process of diffusion because, they have
- A. a large volume of surface area ratio
- B. a large surface area to volume ratio
- C. their bodies immersed in the nutrients
- D. their outer membrane made of cellulose
Diagrams X and Y above are illustrations of transverse sections of a part of plants, Study them and answer this question.
The part labelled Il is the?
- A. Pith
- B. xylem
- C. Phloem
- D. endodermis
Bacteria that live in the human intestine assist in the digestion and feed on nutrients the human consumed. This relationship might best be described as
- A) Commensalism
- B) Ectoparasitism
- C) Endoparasitism
- D) Mutualism
(a) Explain the following terms:
(i) putrefaction
(ii) nitrogen fixation
(iii) nitrification
(iv) denitrification
(b) State three differences between nitrogen fixation and denitrification.
(c) Explain how nitrogen from urine gets to the roots of plants.
View Discussion (0)WAEC 2011 THEORYWhich of the following best describes a marine habitat? A large body of water A
- A. which has no distinctive colour or taste
- B. with high concentration of salt
- C. with tittle suspended materials
- D. with no water weeds
Micro-organisms which break down dead organisms and absorb their contents are called
- A. decomposers
- B. consumers
- C. parasites
- D. commensals