Verified Waec 2018 Biology Answers

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Verified Waec 2018 Biology Answers

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6ai)
Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
6aii)
i)Bacteria
ii)methanogenic archaea

6b)
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.

6c)
i)They are composed of relatively few species of plants
ii)The salt level of the habitat is high
iii)High flooding rate
iv)extreme temperature and salinity fluctuations.
6cii)
Roots of salt marsh plants help stabilize the sandy substrate and trap and hold nutrients and detritus that flow through with each tidal cycle. This detritus trap helps feed bacteria, algae, and invertebrates. These root tangles also provide critical refuge for small fish and other animals.



3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.

3bi)
i)oxygen
ii)fresh water
3bii)
I)oil
ii)natural gas

3c)
i)Regulated and Planned Cutting of Trees.
ii)Control over Forest Fire.
iii)Reforestation and Afforestation.
v)Check over Forest Clearance for Agricultural and Habitation Purposes.
iv)Proper Utilization of Forest and Forests Products.



2a)
i)carbon dioxide
ii)Nitrogen

2b)
i)CO2 is used by plants to photosynthesize carbohydrates.
ii)Nitrogen is a major component of chhlorophyll

2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
2cii)
The green parts
2ciii)
i)The parts without chlorophyll do not photosynthesise
ii)the cells contain chlorophyll
2civ)
Magnesium

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