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*BIOLOGY ESSAY ANSWERS*

(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)

(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

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(2a)

(2bi)
TABULATE
=HERBIVORE=
(i) Absence of canine
(ii) Presence of diastema
(iii) Weak molar

=CARNIVORE=
(i) Presence of canine
(ii) Absence of diastema
(iii) Strong molar

(2bii)
TABULATE
=HUMAN=
(i) Absence of diastema
(ii) Presence of canine
(iii) Presence of upper incisors
(iv) Presence of upper premolar

=GOAT=
(i) Presence of diastema
(ii) Absence of canine
(iii) Absence of upper incisors
(iv) Absence of upper premolar

(2c)
Milk teeth are the first set of teeth that grows in an infant when they want to start feeding on solid food. It starts to grow 6months after birth. There 20 milk teeth

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(4ai)
Conservation law 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)
(i)Conservation of mass and energy
(ii)Conservation of linear momentum, conservation of angular momentum
(iii)Conservation of electric charge

(4bi)
(i)Lax and broken regulation systems
(ii)Highly-priced and valued animal parts, products, and pets

(4bii)
(i) Elephants
(ii) Rhinos
(iii) Tigers
(iv) Gorillas
(v) Sea turtles

(4c)
(i) Loss of biodiversity, migration of wildlife
(ii) Exological imbalance
(iii) Soil erosion
(iv) 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.

(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.

(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

(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

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