WAEC 2021 BIOLOGY SOLUTIONS

(1a)
(i) Plasma
(ii) Red blood cell
(iii) White blood cell
(iv) Platelets

(1b)
(i) Plasma
(ii) White blood cells
(iii) Red blood cells
(iv) Platelets
(v) Red blood cells
(vi) Platelets
(vii) White blood cells

(1c)
(i) Amino acids
(ii) Glucose
(iii) Mineral salts and water

(1d)
(i) Anemia
(ii) Haemophilia
(iii) Blood clots
(iv) Leukemia

(1e)
Disease of the blood is dangerous because it can lead to other issues and consequently death.

(NUMBER 2)

(2a)
(Pick one definition)

Dentition refers to the number,arrangement and conformation of teeth in an organisms

OR

Dentition refers to the development of teeth and their arrangement in the mouth of animals

(2b)
The tooth consists of three main portions namely ;The crown,neck and root. The crown is above the gum covered with a white hard substance called enamel. The short neck is covered with gum. The root is embedded in the jaw bone by a substance called cement or cementum

(2c)
(i)Proteins
(ii)Fats
(iii)cellulose

(2d)
Draw the diagram above☝🏿

(4a)
TABULATE PLS

=ANIMAL=
(i) Peacock
(ii) Horse
(iii) Python
(iv) Lion
(v) Elephant

=ONE BODY PARTS THAT MAKES ANIMAL ENDANGERED BY HUMAN ACTIVITIES=
(i) Feathers
(ii) Tail
(iii) Skin
(iv) Skin
(v) Tusk

(4b)
(i) Overgrazing; The activity of Overgrazing leads to the extraction of grasses which invariably leads to erosion-wasting away of the soil surface

(ii) Poaching; Poaching which is damage by the soil and grass also leads to gulley erosion

(4c)
(i)The establishment of forestry departments and establishment of environment Protection agency to improve the situation.

(ii)the role of creation of Parks and Games Reserves/any correctly named example.

(iii)the role of conservation education carried out through tree planting/ campaigns against bush burning/ tree.

(iv)the role of preserve/maintain plants and animals in their natural environment

(5gi)
Biofuel, any fuel that is derived from biomass—that is, plant or algae material or animal waste. Since such feedstock material can be replenished readily, biofuel is considered to be a source of renewable energy, unlike fossil fuels such as petroleum, coal, and natural gas.

(5gii)
Biodiesel
Ethanol
Wood
Biogas



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