2018 WAEC JAN/FEB BIOLOGY ANSWERS FREE

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1-10:ABCDABBBBB

11-20:BDAAABCDBD

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41-50:DDDBAACDAC

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(3ai)
Ecosystem is a system that includes all living organisms (biotic factors) in an area as well as its physical environment (abiotic factors) functioning together as a unit.

(3aii)
Abiotic environment are all physical and nonliving chemical factors, such as soil, water, and atmosphere, which influence living organisms.

(3bi)
-Temperature
-Salinity
-Flow.

(3bii)
-Altitude
-Humidity
-Temperature

(3c)
In a simple ecosystem that consists of rabbits and grass. The grass reproduces at a certain rate, and the rabbits randomly wander around the world eating the grass. If a rabbit stumbles across a patch of grass, they will eat it and gain energy. If a rabbit gains enough energy, they will reproduce. Conversely, if a rabbit wanders around too long without finding any grass to eat, they will die.

(3d) DRAW THE PYRAMID

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(4ai)
Mendel's law of inheritance states that genes are responsible for the development of the individual and that they are independently transmitted from one generation to another without undergoing any change.

(4aii)
-In production of drugs
-In production of organisms that are resistance to diseases
-In idetification of paternity of a child
-In identification of human blood types
-In studying of human genotypes

(4aiii)
-Continuous inbreeding reduces productivity and fertility of the animals
-Inbreeding increases homozygosity
-Inbreeding to an ancestor increases the risk of inheriting any undesirable characteristics it carried.

(4bi)
Evolution is change in the heritable characteristics of biological populations over successive generations.


‬: 1ai)glucose--

Breakdown

Digestion

 (1aii) Oxygen-

 yield energy in the form of ATP as it is passed down the respiratory chain


act as an acceptor for electrons and hydrogen, forming water

(5a)
Evaporation
Condensation
Precipitation
Collection
Transportation
 


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