WAEC GCE BIOLOGY ANSWERS

fWAEC GCE BIOLOGY
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EXAM TIME:
Biology 2 (Essay) 9.30am - 11.10am
Biology 1 (Obj) 11.10 am - 12.00pm
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(1a)
Blood- tissue
Guinea Pig - organism
Hebiscus Flower - organ.
Human Skeleton - System.
Plasmodium - Cell.
(1b)
Homeostasis can be defined as the process whereby
organisms keep conditions in their internal
environment fairly constant.
(1c)
(i)The kidney is an excretory organ.It also carries out
the maintainance of acid base balance in the body.Due
to the fact that it is in direct contact with the
blood,when the blood is too acidic,more acid is
removed from the blood by the kidney and loss of
base is prevented when the concentration a base
becomes too high more salt is excreted
(ii)
-Temperature;when the temperature in the
environment is very high,you sweat more and you
urinate less and when the temperature of the body is
low,you sweat less and you urinate more.Therefore on
a cold day the kidney works more and on a hot day
the kidney works less.
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(2a)
6CO2+6H2O->C6H12O6+6O2
(2b)DRAW THE DIAGRAM
(2c)
-It regulates blood sugar
-It carries out deamination
-It is a reservoir for blood
-It aids digestion by producing bile
-It produces and destroys red blood cells in foetus and
adult respectively
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(3a)
DRAW THEW DIAGRAM
(3b)
Clay;
-it is a heavy soil
-It is very acidic
-Most crops do not grow well on clay soil
-The particles are tightly bound together
Sandy;
-It is easily heated up during the day
-It has a poor mineral holding capacity
-It has poor water holding capacity
-It is low in organic matter
(6a)
(i)
-Intraspecific competition
-Interspecific competition
(ii)
-teritotry
-food
-water
-gases
(iii)
(6b)
-Transpiration
-Cutation
-Sweating
(6c)
(i)Fluid feeders;mosquito,tsetse fly
(ii)Filter feeders;duck,humming bird
(6d)
-Cornfield layer; (i)It protect the skin from mechanical
injury
(ii) Homeostasis
-Air erector muscle:
(i)It maintains body temperature
(ii)It maintains the streamliness of the body
-Sebaceous gland:
(i)It lubricates the hair
(ii)It produces serum that has anti-microbial effect
(6e)
-Increase in birth rate(Natality)
-Increase in food supply
-Decrease in death rate
-Reduction of predators
(6f)
-Controls birth rate
-Prevent unwanted pregnancy
-Reduces abortion
-Prevent overpopulation
-Improves child mother care
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