Waec Biology Answers 2023

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Biology answers

*BIOLOGY OBJ*
“`01-10: DCADABCADB
11-20: ABDBABDAAA
21-30: ACBABBCBCB
31-40: ABDDDBDACA
41-50: ACCADCDBBA“`

*BIOLOGY ANSWERS*

(1a)

Cell is the basic and smallest unit of life. It is the functional unit of life, from which all living things are built.

(1aii)

(i) Robert Hoke

(ii)Theodore Schwann

(iii) Matthias Jakob Schleiden.

(1bi)

Draw the diagram below

(1bii)

Red blood cell

(1biii)

it will have a short life span

(1c)

(i) Nucleus

(ii) Cell membrane

(iii) Cytoplasm

(iv) Chloroplast

(v) Mitochondrion

(vi) Golgi body

(1ai)

A cell can be defined as the basic structural and functional unit of life. All living organism are made up of cells

(1aii)

(i) Robert Hooke

(ii) Felix Dujardin

(iii) Mathias Schleiden

(1bi)

[img]https://i.imgur.com/bVpXsxA.jpg[/img]

(1bii)

Red blood cell

(1biii)

It does not replicate itself but rather die off

(1c)

(i) Nucleus

(ii) Cell membrane

(iii) Cytoplasm

(iv) Chloroplast

(v) Mitochondrion

(vi) Golgi body

(2a)

[TABULATE]

(i) – ELEMENT-

Hydrogen

-MACROELEMENT-

Tick ✔️

(ii) – ELEMENT-

Copper

-MICROELEMENT-

Tick

(iii) – ELEMENT-

Magnesium

-MACROELEMENT-

Tick ✔️

(iv) – ELEMENT-

Zinc

-MICROELEMENT-

Tick ✔️

(v) – ELEMENT-

Phosphorus

-MACROELEMENT-

Tick ✔️

(vi) – ELEMENT-

Maganese

-MACROELEMENT-

Tick ✔️

(vii) – ELEMENT-

Boron

-MICROELEMENT-

Tick ✔️

(viii) – ELEMENT-

Nitrogen

-MACROELEMENT-

Tick ✔️

(ix) – ELEMENT-

Carbon

-MACROELEMENT-

Tick ✔️

(x) ELEMENT

Oxygen

-MACROELEMENT-

Tick ✔️

(2b)

[TABULATE]

-HERBIVORE-

(i) They are animals that consume only plant and their products

(ii) They have very small mouth opening and consume food from their mouth

(iii) They have broad, flat and short, teeth to grind and chew plant leaves, grains, and seeds.

-CARNIVORE-

(i) They are animals that consume the flesh of other animals

(ii) They have large mouth opening and use their teeth for tearing the flesh apart

(iii) They posses long, sharp, and curved incisors and canines to tear flesh.

(2bii)

[TABULATE]

-HUMAN-

(i) Humans are homo sapiens

(ii) Humans are omnivores

(iii) Humans have a complex nervous system

(iv) Humans walk upright on two legs

-GOAT-

(i) Goats belong to the specie of capra hircus

(ii) Goats are herbivores

(iii) Goats have a small brian

(iv) Goats walk on four legs

(2c)

Milk teeth are sets of early, temporary teeth in children or young mammals which fall out as the permanent teeth emerge.

(3ai)

Ecological niche refers to the specific portion of a habitat which is occupied by a particular species or organism

(3aii)

– Food

– Shade

– Wind breaker

– Absorb Carbobdioxide

– Promote Photosynthesis for oxygen provision

(3bi)

[Pick any two]

– Overview of the content of the environment

– To have different outcome

– To know the range of organisms in that area

(3bii)

– Simple random sampling

– Systematic Sampling

– Convenience Sampling

– Clustered Sampling

(3c)

– Whorl

– Compound

– Loop

– Arch

(3di)

Garden peg ( Potassium Satiuim)

(3dii)

[Pick any two]

– Flower are bisexual

-They are self pollinating

– Short lifespan

– Some seed are round others are wrinkled

(4ai)

It states that the amount of the conserved quantity at a point or within a volume can only change by the amount of the quantity which flows in or out of the volum.

(4aii)

– Conservation of mass and energy

– Conservation of linear momentum, conservation of angular momentum

– Conservation of electric charge

(4bi)

– Lax and broken regulation systems

– Highly-priced and valued animal parts, products, and pets

(4bii)

– Elephants

– Rhinos

– Tigers

– Gorillas

– Sea turtles

(4c)

– Loss of biodiversity, migration of wildlife

– Exological imbalance

– Soil erosion

– Disruption in hydrological cycle of water catchment area

(4di)

A blood transfusion is a routine medical procedure in which donated blood is provided to you through a narrow tube placed within a vein in your arm. This potentially life-saving procedure can help replace blood lost due.

(4dii)

An antigen is any substance to which the immune system can respond. For example, components of the bacterial cell wall can trigger severe and immediate attacks by neutrophils.

(5a)

TABULATE

=EARTHWORM=

(i) Straight

(ii) Simple

(iii) It feeds on fluid

=COCKROACH=

(i) Curve

(ii) More enveloped

(iii) It feeds on both fluid and solid

(5aii)

(i)Possession of crop

(ii)Possession of gizzard

(iii)Possession of pharynx

(5b)

(i) Water cycle

(ii) – Plant contribute through transpiration

– Animals contribute through respiration

– Animals contribute through perspiration

(iii)

– X: Condensation

– Y: Transpiration

– Z: Evaporation

(5c)

TABULATE

=ORGAN=

(i) Kidney

(ii) Skin

=DISEASES=

(i) Kidney stones, diuresis and oedema

(ii) Eczema, acne, vitiligo

(5di)

This is a process whereby heterotrophic organisms utilize the remains of one living tissue as a source of nutrition

(5dii)

(i) Fungi

(ii) Bacteria

(5diii)

Temperature

(5div)

Carbon cycle

(5e)

They exhibit heterotrophic nutrition known as carnivorous or insectivorous feeding. They have attractive colours that attracts insects to them. Once the insect lands in their spine, they are killed and digested

(2a)

[TABULATE]

(i) – ELEMENT-

Hydrogen

-MACROELEMENT-

Tick ✔️

(ii) – ELEMENT-

Copper

-MICROELEMENT-

Tick ✔️

(iii) – ELEMENT-

Magnesium

-MACROELEMENT-

Tick ✔️

(iv) – ELEMENT-

Zinc

-MICROELEMENT-

Tick ✔️

(v) – ELEMENT-

Phosphorus

-MACROELEMENT-

Tick ✔️

(vi) – ELEMENT-

Maganese

-MACROELEMENT-

Tick ✔️

(vii) – ELEMENT-

Boron

-MICROELEMENT-

Tick ✔️

(viii) – ELEMENT-

Nitrogen

-MACROELEMENT-

Tick ✔️

(ix) – ELEMENT-

Carbon

-MACROELEMENT-

Tick ✔️

(x) ELEMENT

Oxygen

-MACROELEMENT-

Tick ✔️

(2b)

[TABULATE]

-HERBIVORE-

(i) They are animals that consume only plant and their products

(ii) They have very small mouth opening and consume food from their mouth

(iii) They have broad, flat and short, teeth to grind and chew plant leaves, grains, and seeds.

-CARNIVORE-

(i) They are animals that consume the flesh of other animals

(ii) They have large mouth opening and use their teeth for tearing the flesh apart

(iii) They posses long, sharp, and curved incisors and canines to tear flesh.

(2bii)

[TABULATE]

-HUMAN-

(i) Humans are homo sapiens

(ii) Humans are omnivores

(iii) Humans have a complex nervous system

(iv) Humans walk upright on two legs

-GOAT-

(i) Goats belong to the specie of capra hircus

(ii) Goats are herbivores

(iii) Goats have a small brian

(iv) Goats walk on four legs

(2c)

Milk teeth are sets of early, temporary teeth in children or young mammals which fall out as the permanent teeth emerge.

*WAEC BIOLOGY THEORY ANSWERS*

*NUMBER (2b)*

Difference between dentition of Herbivores and Carnivores

a) *INCISORS*

*Herbivores:* The incisors of herbivores are sharp and are used mainly to cut, gnaw and bite

*Carnivores:* The incisors of carnivores are pointed teeth and are used to catch prey

b) *MOLARS AND PREMOLARS*

*Herbivores:* Molars and premolars of herbivores have flat grinding surfaces, and they grow continuously throughout their lifetime.

*Carnivores:* Premolars and molars of carnivores are flattened with uneven edges and are used to shear the flesh of prey into smaller pieces. They do not grow continuously throughout life.

c) *CANINES*

*Herbivores:* Ruminants have canines that are similar to incisors. Gnawing herbivores do not have canines.

*Carnivores:* Canines of carnivores are long, pointed canines are used to catch, kill their prey and tear the flesh of prey.(2c)

Milk teeth: is a temporary tooth of a young mammal especially one of the human dentition including four incisors, two canines, and four molars in each jaw which fall out during childhood and are replaced by the permanent teeth.

3ai) Ecological niche is a term for the position of a species within an ecosystem, describing both the range of conditions necessary for persistence of the species, and its ecological role in the ecosystem.

(1c)
1.Nucleus
2Ribosomes.
3.Endoplasmic reticulum. …
4.Golgi apparatus. …
5Chloroplasts. …
6.Mitochondria.

3ai) Ecological niche is a term for the position of a species within an ecosystem, describing both the range of conditions necessary for persistence of the species, and its ecological role in the ecosystem.

3aii) provide fruit,
firewood,
poles,
organic matter for soil amendment,
living fence post,
shade,
soil conservation
cattle feed

(4ai)
It states that the amount of the conserved quantity at a point or within a volume can only change by the amount of the quantity which flows in or out of the volume.

(4aii)
– Conservation of mass and energy
– Conservation of linear momentum, conservation of angular momentum
– Conservation of electric charge
(4bi)
– Lax and broken regulation systems

– Highly-priced and valued animal parts, products, and pets

(4bii)
– Elephants
– Rhinos
– Tigers
– Gorillas
– Sea turtles

(4c)
– Loss of biodiversity, migration of wildlife
– Exological imbalance
– Soil erosion
– Disruption in hydrological cycle of water catchment area

(4di)
A blood transfusion is a routine medical procedure in which donated blood is provided to you through a narrow tube placed within a vein in your arm. This potentially life-saving procedure can help replace blood lost due.

(4dii)
An antigen is any substance to which the immune system can respond. For example, components of the bacterial cell wall can trigger severe and immediate attacks by neutrophils.