100% Correct and Real WAEC 2019 Biology Answer Obj and Essay– May/June Expo.
1 – 10: CBABBACABC
11 – 20: CDBCACDDBB
21 – 30: DCCDDBCADB
31 – 40: DBADDAACDC
41 – 50: CCADDCAADC
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Two questions from SECTION A and any one from SECTION B OR C
ORAGNISM |RESPIRATORY SURFACE
Amoeba |Cell membrane
(i) Large surface area
(ii) Thin respiratory surface
(iii) Moist surface
(iv) Efficient transport system.
(i) Meat type A and meat type D
(ii) they contain the lowest fat content
(i)Meat type C and meat type D
– Proteins gives energy
– Strengthens muscle
(i) A, C & D
(ii) A person deficient in protein suffers kwashiokor. Hence a diet with high content in protein is needed.
Meat type D
ii) Meat type F
– For energy and heat to keep the body warm
– Are used as insulators to nerves and cell membranes
– 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
-They have strong suckers and hooks
-They have large Surface area for absorption of nutrients
-They have thin and flattened shape
-They cause blood loss
-They Cause diarr hoea
-They cause severe loss of weight
Saprophytes are mainly non-green plants which do not have chloroplasts and therefore cannot manufacture their own food
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.
5a) secondary’characteristic to
– Broaden of chest
– Public hairs
– Development of adam”s apple
– Public hairs
– Onset of menstration
– Broaden of hips
5c) Summary of Differences Between DNA and RNA. DNA contains the sugar deoxyribose, while RNA contains the sugar ribose. … DNA is responsible for storing and transferring genetic information while RNA directly codes for amino acids and as acts as a messenger between DNA and ribosomes to make proteins.
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 infection or toxic substances like poisons or drugs. 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
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