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The two key cations involved in the action potential of nervous transmissions are?
If a DNA strand has a base sequence TCA, its complementary strand must be?
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because?
The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23)
What is the percentage of occurrence of Imperata spp?
I. High birth rate and high immigration rate
II. Low birth rate and high immigration rate
III. Low mortality rate and low emigration rate
IV. High mortality rate and high emigration rate.
Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?
The correct sequence for the perception of smell in mammals is?
A freshwater plant such as water lily can solve the problem of buoyancy by the possession of?
The appendicular skeleton is composed of the pectoral girdle?
Which of the following is a measure for the control of bilharzia?
People who suck petrol with their mouths run the risk of increasing in their blood the concentration of
Which of the following is TRUE of the process of conjugation in Paramecium?
The blood vessel which carries blood from the alimentary canal to the liver is the?
Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution?
The villus in the small intestine is significant because it?
Aged erythrocytes are destroyed in the?
In the mammalian respiratory system. exchange of gases occurs in the?
In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to?
When the original king and queen of termites die, they are replaced by
The initial volume of water poured into a bag of dry soil was 50ml and the amount that drained through was 35mI. The percentage water content of the fully soaked soil is therefore?
Which of the following is NOT regarded as a pollutant on land or in the air?