Free Waec Gce 2016/2017 Biology Essay And Obj Answers

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BIOLOGY
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BIOLOGY -ANSWERS

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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

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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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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