2015 - WAEC Biology Past Questions and Answers - page 2
11
Ability of the human eye to focus images accurately on the retina is called
A
astigmatism
B
myopia
C
adjustment
D
accommodation
correct option: d
Users' Answers & Comments12
Which of the following processes removes carbon (IV) oxide from the atmosphere?
A
Burning fuels
B
Putrefaction
C
Photosynthesis
D
Respiration in plants
correct option: c
Users' Answers & Comments13
Which of the following characteristic features is not associated with monocotyledonous plants?
A
Well differentiated sepals and petals
B
Presence of fibrous root system
C
Presence of narrow leaves
D
Flora parts are in multiples of three
correct option: a
Users' Answers & Comments14
The main difference between a seed and a fruit is that a fruit
A
is large while a seed is small
B
has two scars while a seed is has one
C
is pigmented while a seed is not
D
can be dispersed by animals while a seed cannot
correct option: b
Users' Answers & Comments15
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
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
A
oxidize the sugar solution
B
hydrolyse the sugar solution
C
dry the sugar solution
D
increase the volume of the sugar solution
correct option: b
Users' Answers & Comments16
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
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
A
neutralize the sugar solution
B
soften the sugar solution
C
change the colour of the sugar solution
D
increase the acid content of the sugar solution
correct option: a
Users' Answers & Comments17
The colour change to be observed in step IV is
A
blue-black
B
brick-red
C
purple
D
violet
correct option: b
A positive test with Benedict's reagent is shown by a color change from clear blue to a brick-red precipitate.
18
Which of the following organs of the alimentary canal is not correctly matched with its function?
A
Gall bladder- stores bile
B
Liver - stores glycogen
C
Appendix - releases enzymes
D
Teeth = grind food
correct option: c
Users' Answers & Comments19
A person suffering from obstruction of the bile duct is advised not to eat fats and oil because
A
bile digests fats and oil
B
fats and oil can only be absorbed whenbile is absent
C
bile emulsifies fat and oil
D
bile adds water to digesting food
correct option: c
Users' Answers & Comments20
A community reaches a climax when
A
only pioneer organisms are present
B
new habitats are constantly being formed
C
there is an introduction of new plants and animal species within the community
D
the composition and size of a community remains constant over a long period
correct option: d
Users' Answers & Comments