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OUR PAST WAEC BIOLOGY ANSWERS
(Answer ONLY TWO Questions)
ORAGNISM |RESPIRATORY SURFACE
Amoeba |Cell membrane
(i) Large surface area
(ii) Thin respiratory surface
(iii) Moist surface
(iv) Efficient transport system.
Meat type A and meat type D
They contain the lowest fat content.
Meat type C and meat type D.
-Proteins give energy.
A, C and D
A person deficient in protein suffers kwashiokor. Hence a diet with high content in protein is needed.
Meat type D
Meat type F
(i) for energy and heat to keep the body warm.
(ii) They are used as insulators to nerves and cell membranes.
(iii) Formation of cell membranes.
Drop the meat on a white paper observe the meat against a source of light, the far part becomes more translucent
-Mistletoe and cacao plant.
-Tapeworm in the gut of humans.
-Cattle and white egret.
-Flowers and honeybee
-Remora and shark.
(i) They have strong suckers and hooks.
(ii) They have large surface area for absorptions of nutrients.
(iii) They have thin and flattened shape.
[Pick any Two]
(i) They have blood loss.
(ii) They cause diarrhoea.
(iii) They cause severe loss of weight.
Saprophytes are mainly non-green plants which do not have chloroplasts and therefore cannot manufacture their own food.
[Pick any Four]
(Answer Only ONE Questions)
The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.
This organism oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in bioremediation. They are important in the nitrogen cycle by increasing the availability of nitrogen to plants while limiting carbon dioxide fixation.
Azotobacter helps to synthesizes some biologically active substances, including some phytohormones such as auxins, thereby stimulating plant growth.
(i) Malphigan tubule
(i) Hepatitis: This is a liver disease defined as inflammation of the liver. It may occur as a result of viral i*******n or toxic substances like poisons or d***s. This disease makes the liver unable to perform it’s functions properly.
(ii) Kidney stones: This is caused by diseased growth in the kidneys within the tubules. This growth narrows rye tubules preventing free flow of urine. It most causes complete blockage of. Urine results.
(i) It makes the system insensitive.
(ii) It Mars the protective role of the system.
(iii) Temperature will be poorly regulated.
Metamorphosis is the series of gradual changes of forms and shape of insect from the fertilized egg to adult.
Grasshopper – Incomplete
Cockroach – Incomplete
Butterfly – complete
Mosquito – complete
Housefly – complete
Past WAEC Biology Theory and Obj Answers
No 4 diagram
Classifications of living things consists of placing together in categories those living things that resembles each other. It involves placing living things into groups that have certain features in common which distinguish them from other groups
1aii) Car von Linnè Also known as Carolus Linnaeus
-Classification is important because it allows scientists to identify the organisms
-Classification is important because it makes it easy for scientists to group the organisms.
– It is also good to properly name organisms via a standardized system
– Phylum(Animal) or division (Plant)
-Vírus can reproduce when present in another living cell
-It possesses characteristics which can be transmitted from one generation to the next
-When a virus is extracted from a living cell and placed in a non living medium, it assumes a crystalline form and thus become non-living
-Virus cannot respire, excrete or respond to stimuli
– Cassava mosaic disease
-They are protein in nature
-They are specific in action
-They are affected by pH
-They are usually involved in revesible reaction
-They accelerate rate of chemical reaction
-LIPASE-fats and oil
-TRYPSIN-proteins and peptones
FAT AND OIL=fatty acids and glycerol
It helps to trap the energy in sunlight for the photolysis of water in photosynthesis
-Magnessium-yellowing of leaves
-Nitogen-yellowing of leaves
-boil the leave to kill the leaves,inactivate the enzymes and burst starch grains.
-Dry in 70% alcohol to decolourise the leave
-Dry the leaf in hot water to soften it
-place on a whole tile and add few drop of iodine solution
-the leave turns blue-black if starch is present
-The odour diffuse in air and it is inhaled into the nose.
-The mucus helps dissolve the odour and it excites the sensory receptor in the nose
-The impulse is carried to the olfacory lobes of the brain where the message is interpreted
i)Airspace-it is found in between the outer and inner membraned .it is imortant for respiratio
II)yolk- it supplied nutrients the embryo
III)chalaza- it hold the yolk and embryo in position within the alburnen
iv)membranes-the membranes protect the egg
v)shell- it protects and aids respiration because it is porous
vi)albumen-it is rich in protein for the nourishment of the embryo
An autotroph or producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions
Function of WHO
-Providing leadership on matters critical to health and engaging in partnerships where joint action is needed
– Shaping the research agenda and stimulating the generation, translation and dissemination of valuable knowledge
-setting norms and standards and promoting and monitoring their implementation
-Articulating ethical and evidence-based policy options
-Providing technical support, catalysing change, and building sustainable institutional capacity
-Monitoring the health situation and addressing health trends
4a)draw the diagram between mother and father,under it write their possible blood group of the father are blood group A,Bor O
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-in order to invite are another for food or mate
-in order to alert or prevent one another against threat to life.