How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
Which of the following organs of the alimentary canal is not correctly matched with its function?
Gall bladder- stores bile
Liver - stores glycogen
Appendix - releases enzymes
Teeth = grind food
Correct answer is C
No explanation has been provided for this answer.
The colour change to be observed in step IV is
blue-black
brick-red
purple
violet
Correct answer is B
A positive test with Benedict's reagent is shown by a color change from clear blue to a brick-red precipitate.
A student used the following steps in testing for a non-reducing sugar.
I. added Benedict's solution to the sugar solution
ll. added dilute hydrochloric acid to the sugar and boiled it;
lll. added sodium hydroxide solution to the solution in ll. and boiled;
IV. added Benedict's solution to the cooled solution in lll.
Use this information above to answer the question.
What is the importance of step ll in the testing process? To
neutralize the sugar solution
soften the sugar solution
change the colour of the sugar solution
increase the acid content of the sugar solution
Correct answer is A
No explanation has been provided for this answer.
A student used the following steps in testing for a non-reducing sugar.
I. added Benedict's solution to the sugar solution
ll. added dilute hydrochloric acid to the sugar and boiled it;
lll. added sodium hydroxide solution to the solution in ll. and boiled;
IV. added Benedict's solution to the cooled solution in lll.
Use this information above to answer the question.
Why did the student add the dilute hydrochloric acid to the sugar solution in step ll? To
oxidize the sugar solution
hydrolyse the sugar solution
dry the sugar solution
increase the volume of the sugar solution
Correct answer is B
No explanation has been provided for this answer.
The main difference between a seed and a fruit is that a fruit
is large while a seed is small
has two scars while a seed is has one
is pigmented while a seed is not
can be dispersed by animals while a seed cannot
Correct answer is B
No explanation has been provided for this answer.