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2018/19 WAEC VERIFIED BIOLOGY (ESSAY & OBJ) IS POSTED HERE

By | On April 19, 2018 (7 months ago)

Biology-Obj
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*2018/19 WAEC MAY/JUNE BIOLOGY OBJ AND THEORY*

WELCOME TO STUDENTCLUB,THE HOME OF ALL EXAM RUNZ
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(1a)

(i) – A sperm cell consists of a head, middle piece and whip like tail. At the anterior end of the head is a structure called acrosome. This acrosome contains a liquid which facilitate the entry of the sperm into an egg. The middle piece are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.

(ii) – A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves at those plants that contain them. Converting the light to the chemical energy. Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. They allow the passage of gases through the intracellular spaces in them.

(1b)
[DIAGRAM]

(1c)
IN A TABULAR FORM MAMMALS AND AMPHIBIANS

MAMMALS

– Mammals give birth to their young ones alive.

– Mammals produce amniotic eggs

AMPHIBIANS

– Amphibians lay eggs
– Amphibians do not produce amniotic eggs

(1d)

– Use of condoms/pills
– withdrawal

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(2a)
(i) carbon dioxide
(ii) Nitrogen

(2b)
(i) CO 2 is used by plants to photosynthesize carbohydrates
(ii) Nitrogen is a major component of chlorophyll

(2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).

(2cii)
The green parts

(2ciii)
(i) The parts without chlorophyll do not photosynthesise
(ii) The cells contain chlorophyll

(2civ) Nitrogen

(2d)
Holozoic:
Human

Parasitic:
Tapeworm; Venus flytrap

Symbiotic:
Lichen

Saorophytic:
Rhizopus; mushroom; housefly.

Autotropic:
Spirogyra; waterleaf plant; elephant grass.

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(3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.

(3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.

(3bi)
(i)oxygen
(ii)fresh water

(3bii)
(i)oil
(ii)natural gas

(3c)
(i)Regulated and Planned Cutting of Trees.
(ii)Control over Forest Fire.
(iii)Reforestation and Afforestation.
(v)Check over forest clearance for agricultural and habitation Purposes.
(iv)Proper Utilisation of Forest and Forests Products.

3d)
i)increases soil nutrients
ii)increases soil air
iii)improve soil structure
iv)does not corrupt the soil

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(4ai)
Gene is the discrete unit of inheritance which are found in the chromosomes of all cell.

(4aii)
A hybrid is an offspring obtained from the cross-breeding of the species that are not closely related.

(4aiii)
Trait is the characteristic factor of an individual which are hereditary.

(4b)
Draw the diagram
Phenotyoic ratio= 3:1
Genotypic ratio= 1:2:1

(4c)
The four transmittable characters in plants are:
-Height
-Colour
-Shape of fruit
-Size of Leaf

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(6a)

(i) – Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight

(6aii)

(i) – Bacteria
(ii) – methanogenic archaea

(6b)

Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.

(6c)

(i) – They are composed of relatively few species of plants

(ii) – The salt level of the habitat is high

(iii) – High flooding rate

(iv) – extreme temperature and salinity fluctuations.

(6cii)

Roots of salt marsh plants help stabilize the sandy substrate and trap and hold nutrients and detritus that flow through with each tidal cycle. This detritus trap helps feed bacteria, algae, and invertebrates. These root tangles also provide critical refuge for small fish and other animals.

6d)
i)Pulmonary Tuberculosis
ii)Cholera
iii)Pertussis
iv)Salmonellosis:
6dii)
i)food poisoning
ii)food spoilage
iii)Low market value of food
6e)
the person need plenty of rest and diet rich in protein, fruits an vegetables and take plenty water
6f)
Tabulate
Tillage
i)the soil is prepared mammally or mechanically
ii)conserves soil nutrients
iii)good for farm practise
Bush Burning
i)fire is used to remove plants
ii)destroyes soil nutrients
iii)a bad farm practise

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