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

A. protein

B. carbohydrates

C. fats

D. reducing

The greatest amount of energy will be obtained by the oxidation of 100kg of

A. meat

B. butter

C. sugar

D. biscuits

The chamber of the mammalian heart with the thickest wall is the

A. right ventricles

B. left auricle

C. right auricle

D. left ventricle

Serum differs from blood plasma because

A. contains blood cells and fibrinogen

B. contains soluble food and mineral salt

C. lacks the blood protein and fibrinogen

D. lacks blood cells and albumin

The part labelled II is the

A. mesocarp

B. pericarp

C. endocarp

D. epicarp

The fruit represented is mainly dispersed by

A. animals

B. water

C. wind

D. birds

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?

A. r = p + q

B. r > p + q

C. q = r - p

D. r< p + q

An ecological succcession often leads to

A. an increase in species diversity

B. decrease in species diversity

C. an unstable community

D. the dispersal of species

Atmospheric nitrogen is converted to soil nitrogen for plant use by

A. nitrification and combustion

B. putrefaction and lightning

C. lightning and nitrification

D. combustion and putrefaction

I. High birth rate and high immigration rate II. Low birth rate and high immigration rate II. 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?

A. II and III

B. I and III

C. I and IV

D. I and II