NECO 2022 Biology Practical Answer – July/Aug Expo

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NECO BIOLOGY PRACTICAL SOLUTIONS

(1ai)  
Specimen A - Microscope
Specimen B - A ripe mango fruit 
Specimen C - Transverse section of a tomato fruit
Specimen D - Groundnut seed
Specimen E - Maize grain 

(1aii) 
1. Eye piece lens 
2. Objective lens
3. Stage

(1aiii) 
Specimen A is used to study small organisms and cells in the laboratory

(1bi) 
[img]https://i.imgur.com/I6C1zkI.jpg[/img]

(1bii) 
Specimen B is dispersed by animals

(1biii) 
1. It is edible.
2. it is brightly colored

(1biv) 
In a tabular form: 

Specimen B:
1. One seeded
2. Hard and woody endocarp 

Specimen C.
1. Many seeded.
2. Fleshy endocarp

(1ci) 
In a tabular form:

Experiment:

Observation: Spot becomes translucent.

Conclusion: Oil is present.

(1cii) 
Fats and oil is present in specimen D.

(1ciii) 
1. Specimen E is a source of food for man.

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(2ai)
Specimen F - Carrot
Specimen G - Irish Potato
Specimen H - Water lily
Specimen I - Prawn

(2aii) 
Vitamin A in specimen F helps to maintain healthy eyes, teeth, skeletal and soft tissue, mucus membranes and skin.

(2aiii) 
It has a swollen root

(2aiv) 
In a tabular form:

Experiment.

Observation: G turns blue black in colour.

Conclusion: Starch is present.

(2bi) 
1. Presence of long petiole which supports the broad lamina on the surface of the water.
2. The upper surface of the leaf is waxy which prevents the clogging of the stomata.
3. Presence of well developed and numerous adventitious roots which anchors the plant firmly
4. Flowers are raised above water surface by long stalks for purpose of pollination.

(2bii) 
Specimen I belongs to the class of Crustacea.

(2biii) 
1. It has two body regions.
2. It has a pair of antennae.

(2biv)
In a tabular form:

External feature:
1. Pair of antennae
2. Pair of legs
3. Stalked compound eyes.

Function:
1. For feeling
2. For walking
3. For sight

(2bv)
(i) It serves as food for man
(ii) It serves a source of income

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(3a)
J; Tilapia Fish.
K; Tadpoles
L; spider 

(3aii)
(i)it both possess operculum 
(ii)it both possess eye
(iii)it both possess mouth 

(3aiii)
Tabulate
Under J;
(i) present of dorsal fin
(ii) absence of spiracles

Under K;
(i) absence of dorsal fin
(ii) present of spiracles

(3bi)
[img]https://i.imgur.com/FTyg1sh.png[/img]

(3bii)
(i)It has fins that help it swim in water.
(ii)It has gills that help it breath in water.

(3ci)
(i)Head
(ii)Cephalothorax

(3cii)
Arachnida 

(3ciii)
(i)presence of wings 
(ii)presence of book lung

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