Waec 2019 Biology Theory and Obj Answers – May/June Expo

Waec 2019 Biology Theory and Obj Answers – May/June Expo


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NIGERIA

**2019 WAEC ~ May/June ~ Biology (Objective)*

*01 - 10 :* CBABBACABC

*11 - 20 :* CDBCACDDBB

*21 - 30 :* DCCDDBCADB

*31 - 40 :* DBADDAACDC

*41 - 50 :* CCADDCAADC

Bye🤭

(No6i)
Lightning. 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder.
(6ii)Nitrosomonas  A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems
6iii.


Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime

*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.


Biology answer

No 1

Tadpoles------ Gills

Cockroaches-- spiracles, trachea .

Domestic fowl.....lungs

Talinum.......Stomata

Earthworm ......Diffusion through skin

Amoeba ..... Cell membrane

Biology answer

No 1

Tadpoles------ Gills

Cockroaches-- spiracles, trachea .

Domestic fowl.....lungs

Talinum.......Stomata

Earthworm ......Diffusion through skin

Amoeba ..... Cell membrane
 1ai)

Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring

1aii)

-Abstinence

-Birth Control Sponge (Today Sponge)

-Birth Control Vaginal Ring (NuvaRing)

-Birth Control Shot (Depo-Provera)

-Birth Control Implant (Implanon and Nexplanon)

1aiii)

-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship

-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds

1b)

i)Hooks and suckers allow it to hold on tightly to the wall of the intestine

ii)Its flat body gives it a large surface area to absorb food

iii)It has no need of a mouth or gut as it absorbs already digested food

1ci) See the diagram.
(No6i)
Lightning. 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder.
(6ii)Nitrosomonas  A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems
B-A TEAM
(6iii)Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.
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.

*CONTINUATION NO1*

*1ai* )
Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring

 *1aii* )

-Abstinence

-Birth Control Sponge (Today Sponge)

-Birth Control Vaginal Ring (NuvaRing)

-Birth Control Shot (Depo-Provera)

-Birth Control Implant (Implanon and Nexplanon)

 *1aiii* )

-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship

-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds

 *1b* )

i)Hooks and suckers allow it to hold on tightly to the wall of the intestine

ii)Its flat body gives it a large surface area to absorb food

iii)It has no need of a mouth or gut as it absorbs already digested food

 *1ci* ) See the diagram.




( *6iii* )
Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.*1ai* )
Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring

 *1aii* )

-Abstinence

-Birth Control Sponge (Today Sponge)

-Birth Control Vaginal Ring (NuvaRing)

-Birth Control Shot (Depo-Provera)

-Birth Control Implant (Implanon and Nexplanon)

 *1aiii* )

-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship

-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds

 *1b* )

i)Hooks and suckers allow it to hold on tightly to the wall of the intestine

ii)Its flat body gives it a large surface area to absorb food

iii)It has no need of a mouth or gut as it absorbs already digested food

 *1ci* ) See the diagram.




( *6iii* )
Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.


NIGERIA✅

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.

*Q2ai* . Enzymes are substances produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.

ii.
1. Speed up chemical reactions.
2. Required in minute amount.
3. Highly specific in their action
4. Affected by pH
5. Affected by temperature

(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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