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The 100% Correct 2015 Waec Gce Biology Answers
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.
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
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Biology Questions
SECTION A
Answer Two Question From This Section
1(a) State the levels of organisation of the following organisms/
structures:
(i) blood
(ii) guinea pig
(iii) hibiscus flower
(iv) human skeleton
(v) plasmodium [5 Marks]
(B) What is homeostatics? [3 Marks]
(C) (i) Explain briefly how the kidney maintains acid-base
balance of the blood [6 Marks]
(ii) Explain two factors that affect the functioning of the kidney
[6 Marks]
2(a) Write a balanced chemical equation for the process of
photosynthesis [4 Marks]
(B) Make a diagram 8cm - 10cm long of the transverse section
of a dicotyledonous leaf and label fully [11 Mark]
(C) State five functions of the mammalian liver [5 Marks]
(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. [7
Marks]
(B) State four reasons why each of the following soils is not
suitable for crop production:
(i) clayey
(ii) sandy [8 Marks]
SECTION C
(6A)
(i) Name the two types of competition in an ecosystem [2
Marks]
(ii) List four factors that bring about competition among
organisms [4 Marks]
(iii) Explain briefly the role of competition in the process of
succession [2 Marks]
(B) State three ways by which water is lost from living
organisms to the atmosphere [3 Marks]
(C) Name two organisms each which are:
(i) fluid feeders
(ii) filter feeders [4 Marks]
(D) State two functions each of the following part of the
mammalian skin:
(i) cornfield layer
(ii) hair erector muscle
(iii) Sebaceous gland [6 Marks]
(E) State four factors that can result in overcrowding in a
habitat [4 Marks]
(F) State five benefits of family planning [5 Marks]
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| (2b) diagram of dicotyledon leaf and fully labeled |
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