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WAEC 2019 BIOLOGY OBJ & THEORY VERIFIED ANSWERS

Biology -Obj

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Biology 2 (Essay) 9:30 a.m -11:10 p.m

1)

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(2a)
(i) Meat type A and meat type D
(ii) they contain the lowest fat content 
(2bi)
(i)Meat type C and meat type D
(ii)
– Proteins gives energy 
– Strengthens muscle 
(2ci)
(i) A, C & D
(ii) A person deficient in protein suffers kwashiokor. Hence a diet with high content in protein is needed.
(2di)
Meat type D
ii) Meat type F
(2e)
carbohydrates
(2f)
– For energy and heat to keep the body warm 
– Are used as insulators to nerves and cell membranes 
– Formation of cell membranes
(2g)
Drop the meat on a white paper observe the meat against a source of light, the far part becomes more translucent

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NIGERIA✅

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3a) tabular form
Parasitism=
Cattle and white fgret
Tapworm in the gut of human

Mutualism=
Lachea
Flowers and honey bees..

Commensalism=
Mistletoe and cacao plant.
ramorant plant

3c

i) Saprophytes are plants, fungi, and microorganisms that feed on dead or decaying matter (or, in more current and specific usage, they feed on the fungi that feed on the decaying material).

ii) examples are
—-> molds
—-> ghost plant or Indian pipe
—->mushrooms
—->gnome plant…….

=================================================================

(6ai)
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.

(6aii)
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.

(6aiii)
Azotobacter helps to synthesizes some biologically active substances, including some phytohormones such as auxins, thereby stimulating plant growth.

(6b)
(i) Malphigan tubule
(ii) Nephridium

(6c)
(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.

(6di)
(i) It makes the system insensitive.
(ii) It Mars the protective role of the system.
(iii) Temperature will be poorly regulated.

(6dii)
(i)Cornified layer.
(ii)Granular layer.
(iii)Malphigean layer.

(6ei)
Metamorphosis is the series of gradual changes of forms and shape of insect from the fertilized egg to adult.

(6eii)
Grasshopper – Incomplete
Cockroach – Incomplete
Butterfly – complete
Mosquito – complete
Housefly – complete

Posted by on 21st April 2019.

Categories: WAEC

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2 Responses

  1. I want answer at time

    by I need it on Apr 25, 2019

  2. Chika

    by those drawing are not clear why on Apr 17, 2020

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