NECO 2021 - BIOLOGY PRACTICAL ANSWER


(1ai)
A - Atlas Vertebra.
B - Thoracic vertebra.
C - Scapula.
D - Lumber vertebra.

(1aii)
A - Neck
B - Thorax
C - Pectoral girdle.
D - Abdomen

(1aiii)
In a tabular form
Under A
1. Reduced Neural spine.
2. Centrum Absent.

Under D
1. Neural spine broad and massive.
2. Centrum present and well developed.

(1aiv)
1. Both B and d have no vertebraterial canal.
2. Both have prominent Neural spines.

(1b)
Draw the diagram [https://i.imgur.com/e6qm39F.jpg]

(1ci)
E - Pooter
F - Sweep net
G - Tridax fruit.
H - Tadpole

(1cii)
E - used for sucking in of tiny invertebrates such as insects from leaves.
F - Used for capturing flying insects such as butterfly.

(1ciii)
G is dispersed by wind.

(1civ)
1 - Sticky secretion for clinging to submerged vegetation.
2 - Skin and external gills for respiration.
3 - Tail for swimming.





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(2ai)
I - Spirogyra
J - Okro fruit.
K - Mango fruit.
L - Tick
M - Bean weevil.

(2aii)
1. Cup shaped chloroplasts.
2. Green, with cylindrical cells.

(2bi)
In a tabular form
Under J
1. Dry dehiscent fruit
2. Many seeded.
3. Dispersal by explosion.

Under K
1. Succulent fruit.
2. One seeded.
3. Dispersal by animal.

(2bii)
L - Arachnida.
M - Insecta.

(2biii)
L - Blood sucking of ticks causes irritation.
M - Feed on seeds thereby reducing the quality and value of the beans.


(2ci)
Draw the diagram [https://i.imgur.com/rvTyM1e.jpg]

(2cii)
In a tabular form
Under L
1. Have no wings to fly.
2. Has no snout.

Under M
1. Have wings for flying.
3. Has an elongated snout




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(3ai)
N - Cactus plant.
O - Water lettuce.
P - Soldier termite.

(3aii)
N - Dry or arid land(terrestrial)
O - Fresh water swamp(aquatic)
P - Soil or wood.

(3bi)
N
1 - Thick succulent stems for storing water.
2 - Spikes protect cast from animals.
3 - Thick, waxy skin to reduce loss of water and to reflect heat.

O
1 - Tiny hairs on the roots and leaves helps it to float.
2 - Waxy leaves which help water run off easily.
3 - Hairy leaves trap air bubbles, making it survive oxygen deficient mediums.

(3bii)
Draw the diagram [https://i.imgur.com/QL73x1P.jpg]

(3ci)
1 - Good source of animal protein as food
2 - Termites drive earthworms from soil that enchance soil fertility.

(3cii)
Soldier termites defend the nest from enemies and do protect the workers during food gathering.









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ANSWER COMPLETED
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