WAEC 2021 Biology Obj & Essay Question And Answer Now Available

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FINAL OBJ ANSWER

Biology OBJ
1-10: CBABDABCDB
11-20: CDDACBBAAB
21-31: CBCCCBABAD
31-40: BCDCDDBDDA
41-50: BDADCABCDD

BIOLOGY ANSWERS

They are to answer 3 questions in all. Two from section A and the one question in section B.

Section A contains nos 1-4

Section B has only number 6 (for Naija)
And no 5 for GHANA

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

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

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

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

(1e)
Diesease of the blood is dangerous because it leads to other issues and consequently death

==========================

(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

=======================

(3a)
IN A TABULA FORM

DECOMPOSER:
-Bacteria
-Mushroom
-Mucor

PRODUCER:
-Water lettuce
-Water leaf
-Algae
-Lemna

CONSUMER:
-Dog
-Tadpole
-Cat

(3b)
(i) CO₂
(ii) Water
(iii) Energy
(iv) Plant Nutrients

(3bii)
(i) Decomposer prevent accumulation of dead organisms
(ii) Increase soil fertility
(iii) Helps to break down biodegradable items

(3c)
(i) Non-biodegradable item
(ii) Metals
(iii) Bones

========================

(6a)
TABULATE PLS

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

=NUTRIENT CYCLE=
(i) Carbon cycle
(ii) Water cycle
(iii) Nitrogen cycle

=OTHER PROCESSES=
(i) Photosynthesis, decomposition, respiration
(ii) Condensation, transpiration evaporation
(iii) Nitrification, ammonification, denitrification

(6bi)
Irritability can be defined A the response to external stimulus. It is one of the characteristics of living organisms which they used in relating to these environment

(6bii)
TABULATE PLS

=ACTION=
(i) Euglena moving towards light
(ii) Opening and closing of minosa plant leaves
(iii) Mosquito avoiding repellants
(iv) Earthworm moving away from light
(v) Sperm cell moving towards chemical substances of an ovum
(vi) Four o’clock plant opening at 4:00pm
(vii) Shoot of bean seedlings growing towards sunlight

=TYPES OF RESPONSE=
(i) Phototaxis
(ii) Thigmotropism
(iii) Negative chemotaxis
(iv) Phototaxis
(v) Positive chemotaxis
(vi) Thermotaxis
(vii) Positive Phototropic

(6ci)
TERRITORIALITY;
(i) Birds
(ii) Bees
(iii) Cougar

(6cii)
SEASONAL MIGRATION;
(i) Dragon flies
(ii) Butterflies
(iii) Northern elephant

(6ciii)
DISPLAY;
(i) Lizard
(ii) Poultry birds
(iii) Humans

*==== COMPLETED ====*

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