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
(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
===GOODLUCK===

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