WAEC 2022 BIOLOGY & OMMERCE OBJ AND ESSAY AVAILABLE HERE.

WAEC 2022 BIOLOGY & COMMERCE OBJ AND ESSAY AVAILABLE HERE.

WAEC 2022 BIOLOGY & OMMERCE OBJ AND ESSAY AVAILABLE HERE.
WAEC 2022 Answers Available Here

WAEC 2022 BIOLOGY & COMMERCE OBJ AND ESSAY AVAILABLE HERE.

Waec Biology & Commerce Obj and Essay

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Biology OBJ

1-10: CBABDABCDB

11-20: CDDACBBAAB

21-31: CBCCCBABAD

31-40: BCDCDDBDDA

41-50: BDADCABCDD

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(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.

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(2a)

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

(2b)

The tooth consist of three main portions namely , The crown , neck and root. The crown is above the gum covered with a white hard substances called enamel, The short neck is covered with gum. The root is embedded in the jaw bone by a substances called cementum

(2c)

(i) Protein

(ii) Fats

(iii) Cellulose

(2d)

Draw the diagram above

https://i.imgur.com/2w2g92E.jpg

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(6a)
IN A TABULA FORM

PROCESS:
(i)Combustion
(ii)Precipitation
(iii)Lighting

NUTRIENT CYCLE:
(i)Carbon
(ii)Water
(iii)Nitrogen

OTHER PROCESSES:
(i)Decay, decomposition, respiration
(ii)Evaporation, transpiration, respiration
(iii)Artificial fertilizers, Nitrogen fixing, denitrification

(6bi)
Irritability is the ability of living things to respond to changes in external and internal stimuli such as light

(6bii)
TYPES OF RESPONSE
(i)Positive phototaxis
(ii)Thigmotropism
(iii)Negative phototaxis
(iv)Chemtropism (positive chemotaxis)
(v)Nastic
(vi)Phototropism

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(3a)
-DECOMPOSER-
(i) Bacteria
(ii) Mushroom
(iii) Mucor

-PRODUCER-
(i) Water lettuce
(ii) Water leaf
(iii) Algae Lema

-CONSUMER-
(i) Dog
(ii) Tadpole
(iii) Cat

(3bi)
(i) Co2 
(ii) Water
(iii) Energy
(iv) Plant nutrients

(2bii)
(i) Decomposers prevent accumulation of dead organisms
(ii) Increase soil fertility
(iii) Helps to break down biodegradable items

(3c)
(i) Non biodegradable items
(ii) Metals
(iii) Bones

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(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

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