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NECO BIOLOGY PRACTICAL ANSWER 2025
No 1-3

(1ai)
A: Housefly
B; Spider
C; Pride of Barbados Flower
D; Bean seed
E; Butterfly

(1aii)
Specimen; A; – Insecta

Specimen; B; – Arachnida

(1bi)
(i)Typhoid fever
(ii)Dysentery

(1bii)
(i)Spongy proboscis.
(ii)Hairy body and legs.

(1biii)
Specimen; A;
(i)Housefly have six legs (like all insects)
(ii)Housefly have a distinct head, thorax, and abdomen

Specimen; B;
(i)spiders have eight legs.
(ii)spiders have a cephalothorax and abdomen.

(1ci)

(1cii) Insecta

(1ciii)
(i)Colorful wings: With scales that give them vibrant colors and patterns.
(ii)Proboscis: A long, coiled tube used for feeding on nectar.
(iii)Compound eyes: Large eyes that provide wide-angle vision.
(iv)Antennae: Used for sensing the environment.

(1civ)
As they feed on nectar from flowers, they transfer pollen from one flower to another, facilitating the reproduction of the plant.

(1cv)
(i)Proboscis: Allows them to reach nectar deep within flowers, coming into contact with pollen.
(ii)Hairy body: Pollen can stick to their bodies and be transferred to other flowers.

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(2ai)
F; Crayfish
G; Grasshopper
H; Humerus of a Rabbit
I; Femur of a Rabbit
J; Orange Fruit

(2aii)
Specimen; F; Malacostraca

Specimen; G; Insecta

(2aiii)
Food Source: Crayfish are an important food source for humans and are commercially harvested or farmed in many parts of the world.

(2aiv)
Specimen; F;
(i)They are primarily aquatic, living in freshwater or saltwater environments
(ii)They have gills for breathing underwater to survive.

Specimen; G;
(i)They are terrestrial, living on land.
(ii)They have a tracheal system for breathing air directly to their tissues.

(2bi)
Specimen; H; Located in the upper arm (forelimb), connecting the shoulder to the elbow.

Specimen; I; Located in the thigh (hindlimb), connecting the hip to the knee.

(2bii)
(i)Scapula (shoulder blade)
(ii)Radius and Ulna

(2c)

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(3ai) K; Honey Bee
L; Land Snail
M; Guava Fruit
N; Irish Potato tuber
O; Sweet Potato tuber

(3aii)

(3bi) Specimen; K; Insecta
Specimen; L; Gastropoda

(3bii) (i)Shell: Presence of a spiral shell for protection.
(ii)Foot: A flat, muscular foot used for locomotion.
(iii)Tentacles: Presence of tentacles on the head for sensory purposes.
(iv)Radula: A radula (a tongue-like structure with tiny teeth) used for feeding.

(3biii) Specimen; K; Production of honey and pollination services.
Specimen; L; Some species are considered a delicacy and are farmed for food (escargot), contributing to local economies.

(3biv) The type of placentation observed is axile placentation.

(3ci) Specimen; N; Stem tuber
Specimen; O; Root tuber

(3cii) Irish potatoes are propagated by vegetative propagation, specifically by planting seed potatoes (pieces of the tuber containing “eyes”

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