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NECO Practical Biology Questions and Answers (Expo)
Specimen A: Land snail
Specimen B: Toad
Specimen C: Spider
Specimen D: Crayfish
(PICK ANY TWO)
(i) Shells are used for decoration
(i) Shells are used as source of calcium for animal feeds.
(ii) It also serve as a source of animal protein for man.
(iii) It causes damages to crop
(PICK ANY TWO TO TALLY WITH SPECIMEN B)
(i) Have a pair of retractable tentacles on their head.
(ii) Presence of shell
(iii) They have a soft and slimy body
(PICK ANY TWO TO TALLY WITH SPECIMEN A)
(i) Absence of tentacles
(i) Absence of shell shell,
(iii) Thick skin covered in warts or bumps.
(PICK ANY TWO)
(i) It aids in accurate species identification and understanding of their ecological roles.
(ii) It is rucial for conservation efforts and monitoring populations
(ii) It contributes to ecological research and ecosystem management
(i) Webbed Feet
(ii) Large Muscular Thighs
(i) Specimen B: Amphibia
(ii) Specimen C: Arachnida
(iii) Specimen D: Malacostraca
(PICK ANY TWO)
(i) Two body segments
(ii) Eight legs
(iii) Multiple pairs of eyes
(PICK ANY THREE)
(i) Hard exoskeleton for protection against predators and physical damage
(ii) Gills for respiration inside water
(iii) Claws for defense, capturing prey, and manipulating objects in their environment
(iv) Antennae for sensory perception
(v) Camouflage and protective coloration which allows them to hide from predators or prey
E: Spirogyra filaments.
G: Groundnut seedling (A week old).
H: Maize seedling (A week old).
J: Slide (plain).
E habitat: Freshwater.
F habitat: Damp and decaying organic matter.
E mode of nutrition: Autotrophic (photosynthesis).
F mode of nutrition: Saprophytic (absorbing nutrients from dead organic matter).
One reason for classifying E in
(i)is its habitat in freshwater.
Mount E and F separately on J and use I to observe the setup.
Observable features of E:
(i) Green coloration.
(ii) Long, filamentous structure.
(iii) Presence of chloroplasts.
Observable features of F:
(i) Fuzzy, cotton-like appearance.
(ii) Rapid growth and spreading.
(iii) Formation of sporangia.
The observed color of E is green, and its role in life is photosynthesis.
(ii) Role: Photosynthesis
(i)Class of G: Angiospermae (Dicotyledonae).
(ii)Class of H: Angiospermae (Monocotyledonae).
(i) Specimen G: Groundnut seedling (A week old) : Hypogeal Germination
(ii) Specimen H: Maize seedling (A week old) : Epigeal Germination
(i) Specimen G: Groundnut seedling (A week old): Reticulate venation
(ii) Specimen H: Maize seedling (A week old): Parallel Venation
K – Pigeon
L – Agama lizard
M – Rat
N – Tilapia
(i) Agama lizards have a strong elongated jaw with sharp teeth adapted for capturing and consuming their prey.
(ii) They have eyes positioned on the sides of their head providing them with a wide field of vision to detect predators and prey.
(iii) Agama lizards have ear openings on the sides of their head allowing them to detect sounds and vibrations in their environment.
(iv) Some species of Agama lizards have a prominent dorsal crest that runs along the length of their head and neck which may serve as a display feature during courtship or territorial disputes.
(PICK ANY FIVE)
(i) Pigeons have a sleek and aerodynamic body shape that reduces air resistance and allows for efficient flight.
(ii) They possess strong pectoral muscles that enable rapid and sustained wing beat for flight.
(iii) Pigeons have lightweight and hollow bones that reduce their overall body weight making it easier for them to fly.
(iv) Their respiratory system including air sacs allows for a continuous flow of oxygen during flight providing them with the necessary energy.
(v) Pigeons have exceptional eyesight enabling them to navigate and find food sources while in flight.
(vi) Pigeons have a remarkable ability to return to a specific location from far distances which is believed to be due to their exceptional navigational skills.
(vii) Pigeons have specialized feathers that provide control and stability during flight as well as insulation and protection from the elements.
(PICK ANY TWO)
(iv) Legs and feet
(PICK ANY TWO)
(iv) Jaws and Teeth
(PICK ANY TWO)
(i) Beak and Jaw Structure
(ii) Body Shape and Posture
(iii) Wing and Limb Adaptations
(iv) Coloration and Camouflage
(v) Visual and Auditory Perception
Check the diagram below 👇
Note: The answers below are for the 2022 NECO exam.
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
1. Eyepiece lens
2. Objective lens
Specimen A is used to study small organisms and cells in the laboratory
Specimen B is dispersed by animals
1. It is edible.
2. it is brightly colored
In a tabular form:
1. One seeded
2. Hard and woody endocarp
1. Many seeded.
2. Fleshy endocarp
In a tabular form:
Observation: Spot becomes translucent.
Conclusion: Oil is present.
Fats and oil is present in specimen D.
1. Specimen E is a source of food for man.
Specimen F – Carrot
Specimen G – Irish Potato
Specimen H – Water lily
Specimen I – Prawn
Vitamin A in specimen F helps to maintain healthy eyes, teeth, skeletal and soft tissue, mucus membranes and skin.
It has a swollen root
In a tabular form:
Observation: G turns blue black in colour.
Conclusion: Starch is present.
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.
Specimen I belongs to the class of Crustacea.
1. It has two body regions.
2. It has a pair of antennae.
In a tabular form:
1. Pair of antennae
2. Pair of legs
3. Stalked compound eyes.
1. For feeling
2. For walking
3. For sight
(i) It serves as food for man
(ii) It serves a source of income
1. Possession of laterally flattened and streamlined body for easy movement in water.
2. Possession of pectoral and pelvic fins for slow movement, balancing and steering.
2. Opisthosoma (or abdomen)
Specimen L belongs to the class Arachnida.
1. It has eight walking legs
2. It has eight simple eyes.
NECO Biology Practical Practice Questions
The questions below are for practice, not the 2023 Biology Practical questions.
1. (a) (i) Phylum of specimens C/Butterfly and E/Grasshopper: Arthropoda
(ii) Reasons for the answer in 1 (a)(i): (I) Metameric segmentation/segmented bodies: (II) Jointed appendages; (III) presence of chitinous exoskeleton/exoskeleton made of chitin; (IV) Bilateral symmetry.
(b) differences between
|Wings present||Wings are absent|
|Proboscis present||Mandibles are present|
|Proleg absent||Mandibles are present|
|Legs are longer||Legs are shorter|
|Claspers are absent||Claspers are present|
|Has one pair of compound eyes||Has simple eyes|
|Has antennae||Absence of antennae|
|Osmeterium absent||Osmeterium present|
|Presence of proboscis||Presence of mandibles|
|Clubbed/rounded/knobbed antennae||Not clubbed/rounded/knobbed antennae/tapering antennae;|
|Wing is membreneous/soft||Harder/less membraneous wings/forewings are leathery|
|Surface of wing is powdery/have scales/eye spots||Surface of wing is not powdery/absence of scales/eye spots;|
|Hind limbs/legs smaller/shorter/less muscular||Hind limbs/legs/larger and elongated/more muscular|
|Abdomen is hairy||Abdomen is not hairy/smooth|
(c) Relationship between specimens C/Butterfly and D/Caterpillar:
(i) C/butterfly is the adult/image of D/Caterpillar
(ii) D/Caterpillar is the larva/larva stage of C/Butterfly
(d) (i) Habitat of specimen D/Caterpillar: Garden/Citrus leaves/vegetables/leaves/fruits/green plant has three pairs of true legs with claws for locomotion. (III) it has claspers; for attachment to vegetation/twid; (IV) presence of four pairs of prologs/false legs: for climbing; (V) its coloured pattern; enables it to blend with its environment/camouflages/escape predators; (VI) it has spiracles; for gaseous exchange, (VII) it has simple eyes for vision (VIII) has osmeterium; as defense mechanism/which emits foul smell to scare away predators.
(e) Diagram/drawing of dorsal view of specimen C/Butterfly
2(a)observable features of biological importance in
Specimen F/Carrot: (i) Main root/tap root/swollen/root tuber; (ii) Presence of lateral roots; (iii) Presence of short stem (green) ; (iv) Presence of foliage leaves; (v) Part of main root tapering
Specimen G/Irish potato: (i) Swollen stem/stem tuber; (ii) Bud(s)/ eye; (iii) Lenticels; (iv) scale leaf; (v) adventitious roots(s)
(b) (i) Classification of (I) Specimen F/Carrot: Root tuber; (II) Specimen G/Irish Potato: Stem tuber. Stem (above the swollen tap root). Specimen G/Irish Potato: Swollen, Stem/tuber; presence of bud(s)/eye; presence of scale leaves/leaf; presence of lentice(s).
(c) Class of specimen H and J: insect
(d) (i) Observable differences between specimen H and J.
|H/Adult mosquito||J/Adult cockroach|
|Smaller in size||Big/large in size|
|A pair of wings||Two pairs of wings;|
|Absence of hard hind wing||Presence of hard hind wing/elytra;|
|Shorter antennae||Longer antennae|
|Absence of maxillary palp/maxilla||Presence of maxillary palp/maxilla|
|Thin legs||Thick/large legs;|
|Absence of spines on legs||Presence of spine on legs.|
(ii) Similarities between specimens H/adult mosquito and J/adult cockroach:
(i) Presence of a pair of compound eyes
(II) Body is divided into three divisions/head, thorax and abdomen
(iii) three pairs of/six(walking) legs
(IV) presence of jointed appendages
(V) presence of a pair of membraneous wings
(VI) Presence of a pair of antenna
(VII) Both have exoskeleton made of chitin
(VIII) Segmented Body.
(i) Feeding Habit of Specimen H/adult mosquito: Piercing and sucking. Specimen J/adult cockroach: Biting and chewing
(ii) Observing features used for feeding in specimen J/adult cockroach: Mandible; maxillae; labrum
4. (a) (i) Phylum of Specimen R/Earthworm: Annelida
(ii) Reasons for the classification of Specimen R/Earthworm:
(I) Presence of metameric segmentation/segments are separated from each other (by septa
(II) They are bilaterally symmetrical
(II) Segments are separated from each other
(IV) Presence of chaetae
(V) Body is covered by thin collagen cuticle
(VI) body is long and cylindrical.
(iii) Habitat of Specimen R/Earthworm:
(I) Under decaying leaves
(II) Wet/moist soil
(III) In open savanna/savannah beneath tall grasses
(IV) In the forests in decaying tree-stumps.
(b) (i) Features of adaption of Specimen R/Earthworm:
(I) Bristle like Caetae/seatea; for locomotion
(II) Mosit skin; for gaseous exchange
(III) Pointed anterior; for burrowing into the soil
(IV) Slimy body; reduces friction during movements
(V) Citellum; for attachment during exchange of sperms/reproduction/secretes cocoon (in which it eggs are deposited).
(ii) Economic importance of Specimen R/Earthworm:
(I) it aerates the soil
(II) it enriches/improves soil fertility
(III) its secretions neutralize the acid soil
(IV) Used as bait for fishing
(V) As food for some birds.
(c) Diagram/Drawing of the dorsal view of Specimen R/Earthworm
(d) Type of fruit: Specimen S/unripe mango fruit – Drupe, Specimen T/tomato fruit – Berry.
(e) (i) Observable differences between Specimens S and T
|Specimen C/Unripe Mango Fruit||Specimen T/tomato Fruit|
|Green in colour||Red/Yellow in colour|
|One seeded||Many seeded|
|Stony/hard endocarp||Fleshy/Succulent/Soft endocarp|
|Fibrous mesocarp||Succulent mesocarp|
|Seed large||Seed(s) small;|
|Basal placentation||Axile placentation|
|Mesocarp and endocarp are fused||Mesocarp had endocarp are not fused|
(ii) Similarities between specimens S and T:
(I) Both have seeds
(II) both are fruits
(III) Both have three layers/epicarp/mesocarp/endocarp/pericarp/fruit wall
(IV) Coloured epicarp/pericarp
(V) Both have placenta
(VI) Both have thin epicarp
(VII) both have fleshy mesocarp.
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