WAEC 2018 BIOLOGY THEORY AND OBJECTIVE ANSWER / EXPO / RUNZ


BIOLOGY OBJECTIVE ANSWER

VERIFIED BIOLOGY OBJ
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11-20:ADDDCBABBC
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31-40:CABCCCCCAA
41-50:CABBDBDBA




BIOLOGY THEORY ANSWER
 (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 chhlorophyll

(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 photosynthesize
(ii) The cells contain chlorophyll

(2civ) Nitrogen

(2d)
Holozoic:
Human
Parasitic:
Tapeworm; Venus flytrap
Symbiotic:
Lichen
Saprophytic:
Rhizopus; mushroom; housefly.
Autotropic:
Spirogyra; waterleaf plant; elephant grass.
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(3ai)
renewable resource is a resource which 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) Improves soil structure.
(iii) Does not corrupt the soil.
(iv) Increases soil humus.

(3e)
Hb², Hb², I^a, I^o, I^o, T, t
====================================
(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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5a)
Evaporation
Condensation
Precipitation
Collection
Transportation
i)PH is pH meter
ii)Light intensity is photometer
iii)Turbidity is nephelometer or turbidimeter,
.
5b)Glucose
I. Glucose is the main energy source for body cells.
.
Ii. glucose plays a
structural role with its inclusion in carbohydrate additions to proteins.
.
iii) Oxygen
I. To burn food for the release of energy stored
Ii. For cellular respiration
.
5c) Nastism are nastic movements which are non-directional
responses to stimuli (e.g. temperature, humidity, light irradiance), and
are usually associated with plants.

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6.

Continuation from image
(6di)
(i) Typhoid fever.
(ii) Dysentery.
(iii) Cholera.

(6dii)
(i)Food poisoning
(ii) Food spillage.
(iii) Low market value of food.
(6e)
The person need plenty of rest and diet rich in protein, fruits and vegetables and take plenty of water.

(6f)
In a tabular form:
Under Tillage:
(i) The soil is prepared.
(ii) conserve soil nutrients.
(iii) Good for farm products.
Under Bush burning:
(i) Fire is used to remove plants.
(ii) Destroys soil nutrients.
(iii) A bad farm practice.



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