WAEC GCE 2018 Biology Expo Answer (Obj And Essay) – Biology WAEC GCE Expo 2018 Sept/Nov Free Expo
2018/2019 WAEC GCE Biology Answer
WAEC GCE Biology Expo Answer 2018
WAEC GCE 2018 Biology Answer Expo
2018 WAEC GCE Biology Expo Answer
WAEC GCE Biology answer 2018
Free WAEC GCE Biology Expo Answer 2018
WAEC GCE Biology Answer
*(1a)*
Skeleton is the bony framework of the body which provides supports,
shape and protection to the soft tissues and organs in animal
(1b)
(i)Hydrostatic(fluid)skeleton
Organisms-->Earthworm and anemones
(ii)Exoskeleton
Organisms-->Moulting
(iii)Endoskeleton
--->Fish
*(1c)*
(Functions of Skeleton)
(Pick 3)
(i)Support:-The rigid framework of the skeleton gives support to the body
(ii)Protection:-The skeleton protects important and delicate organs of the body
(iii)Movement:-The whole skeleton is made up of severely pieces of bones which are jointed and brings about movember
(iv) Respiration:-The skeleton also aids in respiration
(2a)
Vitamins are group of organic compounds which are essential for normal
growth and nutrition and are required in small quantities in the diet
because they cannot be synthesized by the body.
(2b)
Vitamin: C
One Function: Healing of wounds
One Deficiency: Scurvy
One Source: Citrus Fruits
Vitamin: D
One Function: Strong bones and teeth
One Deficiency: Rickets
One Source: Eggs
Vitamin: B
One Function: Releases energy from cabohydraes
One Deficiency: Beri-beri
One Source: Yeast
Vitamin: K
One Function: Clotting of blood
One Deficiency: Failure of blood to clot
One Source: Milk
(2c)
(i) Iron: Assists in nitrate and sulfate reduction and energy production within the plant
(ii) Nitrogen: For rapid growth
(iii) Calcium: It is responsible for holding together the cell walls of plants
(3ai)
Mango trees -> Caterpillars -> chicks of domestic fowls -> Hawks
(3aii) Draw the diagram
(3bi) Water:
-Serves as a habitat for organisms.
-Serves as a source of water for irrigation.
-Serves as a source of hydroelectric power.
(ii) Soil:
-It ensures continuous sources of plant nutrients.
-It ensures sources of water/reservoir for soil organisms.
-It ensures sources of raw materials for some industries.
(iii) Forest:
-It ensures the conservation of trees or forest product.
-It helps to check erosion.
-It helps in the preservation of natural spaces.
5a
A scientific theory is a well-substantiated explanation of some aspect
of the natural world, based on a body of facts that have been repeatedly
confirmed through observation and experiment. Such fact-supported
theories are not "guesses" but reliable accounts of the real world.
A hypothesis is a proposed explanation for a phenomenon. For a
hypothesis to be a scientific hypothesis, the scientific method requires
that one can test it. ... Even though the words "hypothesis" and
"theory" are often used synonymously, a scientific hypothesis is not the
same as a scientific theory.
5B
Designing the Experiment
This stage of the scientific method involves designing the steps that
will test and evaluate the hypothesis, manipulating one or more
variables to generate analyzable data.
Observation
This is the midpoint of the steps of the scientific method and involves
observing and recording the results of the research, gathering the
findings into raw data
Analysis
The scope of the research begins to broaden again, as statistical
analyses are performed on the data, and it is organized into an
understandable form.
Conclusions and Publishing
This stage is where, technically, the hypothesis is stated as proved or disproved.
6a)
i)flexible dujardin
ii)robert hooke
iii)mathiahs von virckow
6b)
TABULATE
classes of plant bases of life cycle and example
i)annual - maize, rice
ii)biennial - carrot, ginger
iii)perenial - banana, cocoa
6c)
The amniotic fluid help on neutralize the effect of changes external temperature
6d)
i)Rhizobium- fixes atmospheric nitrogen directly into the plant
ii)Azotobacter- fixes atmospheric nitrogen into the soil either aerobically anaerobically
iii)Blue Green- improve soil fertilizer
6e)
Click HERE for The Diagram
