2015 WAEC GCE BIOLOGY ANSWER IS READY.GET IT NOW

2015 WAEC GCE NOV/DEC

EXAM DAY: FRIDAY

PAPER: BIOLOGY

Biology obj
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1a)
Blood- tissue,
guinea pig- organism ,
hebiscus flower- organ.
Human skeleton- system.
Plasmodium-cell.

1b)
Homeostasis can be defined as a property of an
organism or system that helps it maintain its
parameters
within a normal range of values. It is key to life, and
failures in homeostasis can lead to diseases like
hypertension and diabetes.

1c)
When d body fluids become acidic ie d concentration
of acids becomes higher than that of d bases d
kidney excretes more acid.
-When d concentration of d base is higher the kidney
will excrete more salt with urine.

1d)
-Inflamation of d nephron caused by bacteria. It
causes glomeruli to filter d blood completely leading
to useful substances like protein to pass out with d
urine excreted by d kidney.
-Secondly wen amino acids and calcium phosphate
settle in d kidney they form kidney stone which
obstructs the free flow of urine

2a)
Photosynthesis can be represented using a chemical
equation.
The overall balanced equation is...
6CO 2 + 6H 2O ------> C 6 H 12 O 6 + 6O 2
Sunlight energy
Where: CO 2 = carbon dioxide
H 2 O = water
Light energy is required
C 6 H 12O 6 = glucose
O 2 = oxygen

2b) Diagram of Dicotyledon leaf and fully labeled

2c)
i)To produce substances that break down fats,
convert glucose to glycogen,

ii)produce urea (the main
substance of urine), make certain amino acids (the
building blocks of proteins), filter harmful
substances from the blood (such as alcohol),

iii)Storage
of vitamins and minerals (vitamins A, D, K and

B12) and maintain a proper level or glucose in the
blood.

Iv)The liver is also responsible fore producing
cholesterol.

v)It produces about 80% of the cholesterol in your
body.

(3a) A sample of garden soil was placed in a measuring cylinder, enough water was added to it. It was shaken and allowed to settle for 30 minutes . Draw a diagram 6cm - 8cm long to show the various layers formed and label fully.

(3b)

SANDY SOIL
(1) Sandy soils hold less water per foot of soil, subjecting hybrids to stress during droughty periods.

(2) Low water-holding capacity (about half that of clay loams and clays); tend to dry out quickly.

(3) More leaching of plant nutrients due to low negative
charge and more downward movement of water (because of lower water holding capacity).

(4) Tend to be lower in natural fertility (but not always) due to greater leaching and low content of nutrient-bearing clay.

CLAY SOIL
(1) Clay soils hold more water than other soil textures, but plant roots are not able to extract the moisture needed from clay soils

(2) More prone to soil compaction by animal, foot, or
machinery traffic leading to poor aeration which can deprive crops of air

(3) Soils high in clay (or silt) tend to crust over upon drying
which can inhibit seedling emergence.

(4) Harder to till, not only in terms of power required, but
also regarding ideal moisture range for tillage. If plowed when too wet, they compact and stick. If worked when too dry they're overly hard and cloddy.


6ai)
(i) By Mechanism
(ii) By species

6aii)
(i) Food
(ii) Water
(iii) Territory
(iv) IDK


(6C)
(i) Fluid Feeder:
are organisms that feed on the fluid of other
organisms. It can refer to
Hematophagy, feeding on blood, which include
bedbug, butterflies, hood mockingbird, oxpeckers
and anopheles stephensi mosquito
Nectarivore, feeding on nectar include bats visit open
flowers where the nectar is not deeply hidden,
hawkmoths and hummingbird
Plant sap feeders

(ii)Filter Feeder:
are a sub group of suspension feeding animals that
feed by straining suspended matter and food
particles from water, typically by passing the water
over a specialized filtering structure. Some animals
that use this method of feeding are clams, krill,
sponges, baleen, whales, and fish (including sharks)

6D
(ii)
(i) to move the position of th hairs
(ii) adjust the angle of hair shafts to change the
degree
of cornfield layer idk
(iii)
(i) maintaing the epidermal permeability barrier,
structure and differentiation
(ii) skin specific hormonal signalling

OR.

(6D)
(i) Conified layer: this is made up of flat, hard, deed and scaly ceels. It contains protein called kerafin which make the skin tough, fleable and water proof. The Conified layer is very thick at the palm and soles of the feet and thin on eye iris

(ii) Hair Erector muscle: is a deep pit formed by the infolding of malgian layer. It contains nerve ending which respond to stimuli to touch, cold and heat

(iii) Sebaceous gland: This secrets sebum into the hair follicle which keep the hair and the epidemis water proof and supple


(6E)
-Increase In birth rate
-Decrease in birth rate
-Abundance of food
-Inadequate Space

(6F)

(i) it enables mother to regain her health delivery

(ii) gives more time for her family and own personal
advancement

(iii) when suffering from illness gives enough time for
treatment and recovery

(iv) healthy mothers produce healthy children

(v) will get all the attention security love and care they deserve