Biology Past Questions And Answers
The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
- A. nitrifying bacteria
- B. denitrifying bacteria
- C. putrefying bacteria
- D. saprophytic bacteria
(a) Write a short note on the importance of the presence of an effective transport system in mammals.
(b) state eight functions of blood in mammals.
(c) list four materials transported in the bodies of flowering plants.
View Discussion (0)WAEC 2005 THEORYThe uniqueness of an individual organism in a population is accounted for by
- A. evolution
- B. variation
- C. adaptation
- D. mutation
A circulatory system is very essential in mammals but not in smaller organisms like Amoeba because
- A. Amoeba lives in freshwater
- B. Diffusion is sufficient to transport materials in Amoeba
- C. Amoeba lacks blood containing haemoglobin
- D. Amoeba exibits anaerobic respiration
One of these is present in both plant and animal cell?
- A. Cell membrane
- B. Cell wall
- C. Chloroplast
- D. Large cell vacuole
Which of the following statements is incorrect about diffusion?
- A. It involves degradation of soluble particles in solvents
- B. it occurs mainly in gaseous and liquid media
- C. No membrane is needed to effect the movement of molecules
- D. Molecules move from region of lower concentration to that of higher concentration.
The following are pathways of energy in the biosphere I. Heat energy is lost from body metabolism to the surrounding air II. Energy passes to decomposers and parasites III. Energy is transferred to the next higher level in a food chain IV. Energy is also passed by conduction to clothing and other objects
Which pathway directly leads to transfer of useful energy within a biological community?
- A. I only
- B. II and III only
- C. I and III only
- D. I and II only
Manufactured food in the plant is transported through the
- A. xylem
- B. phloem
- C. cambium
- D. cortex
The body temperature of a mammal has to be maintained at a fairly constant level because
- A. excessive heat is continually lost by the body to the environment
- B. their body temperature is always higher than that of the environment
- C. evaporation of sweat cools the body
- D. metabolic activities function best at certain temperature
The breakdown of fats and oils into simpler absorbable compounds is catalyzed by the group of enzymes called
- A. lipases
- B. hydrolases
- C. amylases
- D. peptidases