VERIFIED 2021 WAEC BIOLOGY Questions & Answers - Expo
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Theory 👇
(2a)
Dentition refer to the development of teeth and their arrangements 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) protein
(ii) fats
(iii) cellulose
STUDENTS FORUM
(2d)
(3a)
-DECOMPOSER-
(i) Bacteria
(ii) Mushroom
(iii) Mucor
-PRODUCER-
(i) Water lettuce
(ii) Water leaf
(iii) Algae Lemna
-CONSUMER-
(i) Dog
(ii) Tadpole
(iii) Cat
(3bi)
(i) Co2
(ii) Water
(iii) Energy
(iv) Plant nutrients
(3bii)
(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
Students forum
(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
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