OAU Biology 2012/2013 Past Questions

Practice each question, then open it to see the full details.

Which of these groups of animal rivals mammals in the display of parental care features?

A.Birds
B.Reptiles
C.Pisces
D.None of the above

A typical feature of a plant cell is the presence of

A.Chromosome in nucleus
B.Cellulose cell wall
C.Mitochondria
D.membrane around the nucleus

Non — seed plants are found in

A.desert and arctic regions only
B.all environments
C.cold mountain areas and hot springs
D.tropical and subtropical regions only

Which of the following phyla has been found to be the most successful in the animal kingdom?

A.phylum Annelida
B.phylum Arthropoda
C.phylum Chordata
D.phylum Mollusca

In the tropical rainforest, there is little or no litter on the forest floor because of high

A.rainfall
B.temperature
C.light intensity
D.rate of decomposition

Adaptive features of plants to desert conditions include

A.thick barks, succulent stems and sunken stomata
B.thin barks, succulent stems and sunken stomata
C.thin barks, air floats on stems and sunken stomata
D.air spaces on tissue, adventitious roots and thin barks

The distribution of plants in rainforest is governed mainly by

A.vegetation
B.soil types
C.amount of rainfall
D.rainfall pattern

The greatest influence on a stable ecosystem in nature is

A.man
B.pollution
C.animal
D.rainfall

Which of the following is the basic unit of classification?

A.genus
B.species
C.phylum
D.kingdom

Which two structures are present in a palisade cell but not in a liver?

A.cell wall and cytoplasm
B.cell wall and chloroplast
C.cell membrane and chloroplast
D.cell membrane and cytoplasm

Workers in deep mines usually suffer from dehydration because

A.water is lost due to evaporation
B.water is lost due to defecation
C.water is lost in the form of sweat
D.water is lost along with salts in the form of sweat

Glucose is reabsorbed in the kidney mainly by

A.Bowman's capsule
B.Proximal convoluted tubule
C.Distal convoluted tubule
D.Loop of Henle

The most common substrate of respiration is

A.Fats
B.Amino
C.Glucose
D.Sucrose

The rate of heart beat in an adult human being is

A.71 beats per minute
B.72 beats per minute
C.73 beats per minute
D.74 beats per minute

One of the following is not true

A.Saprophytic nutrition involves feeding on soluble organic material from inorganic substances
B.Symbiosis is a nutritional relationship in which both organisms involved derive benefit
C.A parasite causes injuries to its host in the course of getting its food
D.Holozoic mode of nutrition can be seen in animals, carnivorous plants and some protists

......... is responsible for the direction of growth and development of the organism

A.The nucleus
B.The DNA
C.The neuron
D.The RNA

The chromosome number in man is

A.46
B.23
C.92
D.58

A.muscles which work in response to the stimulus received from the motor nerves
B.glands which work in response to the stimulus received from the motor nerves
C.muscles or glands which work in response to the stimulus received from the motor nerves
D.efferent neurons

The following are formed in the bone marrow except

A.platelets
B.basophils
C.granulocytes
D.lymphocytes

An assemblage of populations of different species which interact through trophic & spatial relationship is best described as a(n)

A.City
B.Community
C.Ecosystem
D.Niche