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Which of the following growth activities in plants is brought about by gibberellins?
The range at which soil essential elements concentration is recorded for optimal plant growth is marked
The soil becomes toxic to plants when the concentration of its essential elements is in the range labelled
I. High birth rate and high immigration rate II. Low birth rate and high immigration rate III. Low mortality rate and low emigration 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?
Atmospheric nitrogen is converted to soil nitrogen for plant use by
An ecological succcession often leads to
In an experiment to estimate the volume of air in a soil sample using a measuring cylinder, it was found that:
initial volume of water .... = p cm3
volume of soil before mixing with water = q cm3
Final volume of water after adding soil = r cm3
From the data above, which of the following deductions is correct?
The fruit represented is mainly dispersed by?
The part labelled II is the
Serum differs from blood plasma because
The chamber of the mammalian heart with the thickest wall is the
The greatest amount of energy will be obtained by the oxidation of 100kg of?
The production of violet colouration, when dilute NaOH solution is added to a solution of food substance, followed by drops of 1% CuSO4 solution while shaking, indicates the presence of
For growth to occur in organisms, the rate of
The inner ear contains two main organs, namely, the
Short-sightedness can be corrected by lenses which are
The scapula and the ischium are part of the
The gas occupying the space labelled I is
The substance labelled II originates from