2016 WAEC GCE EXPO: BIOLOGY QUESTIONS AND ANSWERS

       

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BIOLOGY-ANSWERS BY DONIZZY
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Biology Obj
1.ABBCCCDCCA

11.AABAADBDBC

21.BAAAADCCBC

31.CDADCCCBBB

41.CACAACCACD

*ALWAYS SUBSCRIBE FOR EARLY DELIVERY*
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2a)
Enzyme is a substance produced by a
living organism which acts as a catalyst to
bring about a specific biochemical
reaction.
2aii)
i)all enzymes are proteins.
ii)Enzymes possess great catalytic power.
iii)Enzymes are highy specific.
iv)Enzymes show varying degree of
specificities.
v)Absolute specificity where the enzymes
react specifically with only one substrate.
2b)
Pancreatic fluid or juice contains digestive
enzymes that pass to the small intestine
where they help to further break down
the carbohydrates, proteins, and lipids
(fats) in the chyme. Pancreatic juice is a
liquid secreted by the pancreas, which
contains a variety of enzymes including
trypsinogen,chymotrypsinogen, elastase,
carboxypeptidase, pancreatic lipase,
nucleases, and amylase.Pancreatic juice is
alkaline in nature due to the high
concentration of bicarbonate ions. This is
useful in neutralizing the acidic gastric
acid, allowing for effective enzymic
action.
2c)
most importantly,sun provides vitamin D
which helps the body absorb the minerals
calcium and phosphorus from the food
that the boy eat, which is important for
bone health. While milk is the main source
of dietary calcium. Calcium is a major
bone mineral, mandatory for bone health.
2d)
i)Photosynthesis conducted by plants is
also an important part of the carbon
cycle.
ii)It releases oxygen needed for breathing
iii)It serves as source of food
manufacturing for human rights
iv)It provides sources for fuel through
plants
v)it help to balance the ecosystem
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3ai)
i)Fungi
ii)bacteria
iii)viruses
3aii)
i)bacteria - Streptococcus
ii)Fungi- Basidiomycota
iii)Virus- Coxsackievirus
3b)
i)sterilization
ii)disinfection
iii)pasteurization
iv)proper sanitation
v)Proper hygiene
3ci)
i)Increased human population
ii)Habitat Degredation
iii)Climate Change and Global Warming
3cii)
i)Loss of the beauty of environment
ii)leading to climate warming
iii)it can lead to extinction of animals that
feeds on those plants
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4ai)
DRAW THE DIAGRAM
(4aii)
DRAW THE DIAGRAM
1 is homozygous starchy grain
2 are heterozygous starchy
1 is homozygous sugary grain
(4b)
-Starchy=3/4*500
=435 starchy grains
-Sugary =1/4*500
=145 sugary grains
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6a)
i)mimicry is a similarity of one species to
another that protects one or both.
An example of this is the cuckoo bee.
ii)Camouflage is the structural adaption
that enables specie s to blend with their
surroundings; allows a species to avoid
detection by predators.
6b)
i)Their legs are adapted for running
ii)They adapts the leathery forewings as
temina to provide a protective cover for
the second set of wings.
iii)they evolved mandibles to bite and
chew solid food.
6c)
i)It reduces the quality and quantity of
the crops
ii)it reduces their productivity
6d)
i)by refrigerating
ii)by salting
iii)by drying
iv)by the use of silos
6e)
i)in medicine
ii)in crime detection
6f)
i)Inadequate resources
ii)Small planting space
iii)
6g)
Succession is the change in either species
composition, structure, or architecture of
vegetation through time.
6h)
i)it kills microorganisms
ii)It leads to soil erosion
iii)It lost of soil nutrients



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