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NECO 2021 Biology OBJ answers
Here is complete Answers
5 August 2021 Biology OBJ Answers
Biology – OBJ
(i) To search for food.
(ii) Escape predators.
(iii) Find mates for reproduction.
(iv) To disperse/reduce competition/overcrowding by moving to new locations.
Phloem: Responsible for the transportation of enzymes/hormones.
Leaf: is used for photosynthesis
Xylem; is to transport water from roots to stems and leave
Flower; is for reproduction in plant
(i)Low water requirements
(ii)No leaves or small number of leaves
(iii)Possession of thorn or needles
(i)it provides new cells for growth
(ii)for replacement of worn-out cells
An image is formed on the retina with light rays converging most at the cornea and upon entering and exiting the lens. Rays from the top and bottom of the object are traced and produce an inverted real image on the retina. The distance to the object is drawn smaller than scale.
(i)Evidences from Palaeontology
(ii)Evidences from Comparative Morphology
(iii)Evidences from taxonomy
Excretion is the removal of waste products of metabolism which are harmful or would in time interfere with the normal functions of the organisms
Competition is an interaction between a number of the organisms of the same or different species for resources in limited supply such as food, water , space and light
Deforestation is the extensive cutting down of trees for the purpose of either farming it firewood or mining thereby exposing the top soil to agents of erosion
(iii)Dehydration or drying of foods
(i) Meiosis : four daughter cells
(ii) Mitosis: two identical daughter cells
(i)It reduces the risk of diseases from parents to offsprings
(ii)It create diversity and variation among populations
The relationship is known as commensalism in which the remora fish gains while he shark neither gain nor loose. In this case, the remora fish attach itself to the shark which transport it round the water protecting it form predators and it also obtain it’s food through the process. The shark on the other hand neither gain or loose.
It carries filtered blood from the kidney’s to the posterior vena cava
Ecological niche: This is the exact position by an organism in a particular habitat
Population density: This can be defined as the total number of organism per unit area of the habitat
Climax community: This is established when a stable or unchanging community is attained, thus the community is in equilibrium with the environment
Aestivation is the mode of arrangement of sepals or petals in the floral bud with respect to the other members of the same whorl.
(i)Nose for smelling
(ii)Eyes for seeing
(iii)Tongue for tasting
(iv)Ear for hearing
When a person spin around rapidly, that liquid in the inner ear spins as well. When the person stops spinning the liquid keeps moving for a bit, confusing your brain into thinking that the person is still spinning even when the person is standing still and that causes the feeling dizziness after spinning around the stationary object.
Neuron; transmit information to other nerve cells, muscle, or gland cells.
cerebrum; initiates and coordinates movement and regulates temperature
Mendulla Oblongata; passes messages between your spinal cord and brain.
cerebellum; coordinates voluntary movements
(i)tropic the effect is more or less permanent while Nastic movements are temporary and reversible.
(ii)Stimuli for the tropic movements are unidirectional and never diffuse while The stimuli for the Nastic movements may be unidirection or diffuse.
(iii)Movement in tropic movements is directional while Nastic movements is non directional
(i)Contains chlorophyll Absorbs light
(ii)Stomata Allows carbon dioxide to move by diffusion into the leaf
(iii)Guard cells To open and close the stomata depending on the conditions
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NECO Biology Practical Specimen 2021
- SPECIMEN A – Atlas vertebra
- SPECIMEN B – Thoracic vertebra
- SPECIMEN C – Scapula
- SPECIMEN D – Lumbar vertebra
- SPECIMEN E – Pooter
- SPECIMEN F – Sweep net
- SPECIMEN G – Tridax fruit
- SPECIMEN H – Tad pole
- SPECIMEN I – Spirogyra (filaments)
- SPECIMEN J – Okro fruit
- SPECIMEN K – Mango fruit
- SPECIMEN L – Tick
- SPECIMEN M – Bean weevil
- SPECIMEN N – Cactus plant
- SPECIMEN O – Water lettuce
- SPECIMEN P – Soldier termite (mandibulate)
NECO Biology Practical Answers for July 22 (2021)
NECO 2021 Complete Correct Answers
NECO Biology Practical Answers (2021)
A – Alas Vertebra
B – Thoracic Vertebra
C – Scapula
D – Lumbar Vertebra
A – Neck Region
B – Chest Region
C – Shoulder Region
D – Upper Abdomen
(To be Tabulated)
Under Specimen A
(1) It has short neural Spine
(2) Verterbrabeteria Canal is present
Under Specimen D
(1) It has no board and neural Spine
(2) Verterbrabeteria Canal is present
1. They both have neural canal
2. They bother poseses centrum
I – Spirogyra
J – Okro fruit
L – Tick
M – Bean Weevils
1. Their bodies are characterised by multicellular filaments
2. It is an unbranched filamenterous
alegae occurring in stagnant water.
Under Specimen K
1. Seed are small
2. Many seeded
3. Anile placentation
Under Specimen K
1. Seed is large
2. One seeded
3. Basal placentation
L – class arachnid
M – class insect
L – Causes stress in animal affected by bites, blood looses that lead to anemia and even death
M – They makes holes in the plants to oviposition the causing directed and indirect damage
Diagram of Specimen K
Under Specimen L
1. Pear shaped body
2. Approximately 3 to 5 mm in length to age species
Under Specimen M
1. General compact and oral in shape
2. Size range from 1 to 22mm
N – Cactus plant
O – Water lettuce
P – Soldier Termite
N – Terestial habitat l forest
O – Aquatic habitat
P – Teresterial habitat
Adaptive Features of Specimen N (Cactus)
1. Presence of spines to reduce water loses
2. Presence of succulent sterms to consume water
Presence of thick and waxy skin to reduce loss of water
Adaptive Features of Specimen O (Water lettuce)
1. Presence of air
2. Presence of numerous root or absorption
3. Presence of more stomata on upper surface for diffusion of CO2
Diagram of Specimen P
1. It increases humus content of the soil
2. It increases penetration of water in the soil by burrowing
1. Defending the Colony against enemies.
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NECO Practical Questions and Answers (2020)
Specimen; A is yam tuber
Specimen; B is cassava tuber
Specimen; C is quadrant
Specimen; D is insect net
Specimen; E is rain guage
Specimen; F is rice grain
Specimen; G is dry groundnuts seed
Specimen; A is propagated from small tubers
Specimen; B is propagated by stem
Specimen; F is propagated by seeds
Specimen; C is used for for study of the distribution of an item over a large area.
Specimen; D is used for prevention against insects
Specimen; E is used to measure the precipitating rain
Diagram of insect net.
(i)The surface of B turn blue-black
(ii)starch is present
Specimen; F grains (cereals)
Specimen; G puises (legume)
(i)The paper appears translucent
(ii) Specimen; G contain fat and oil or fat and oil is present in specimen G
Fat and oil
Specimen; H is contour feather
Specimen; I is quill feather
Specimen; J is Filoplume
Specimen; K is millipede
Specimen; L is centipede
(i)They provide insulation to birds
(ii)Feathers allow for flight
(iii)Feathers are used for defense
(iv)Feathers are used for camouflage
Diagram of specimen I.
(i)Specimen; H serve as aerodynamic
devices for flight
(ii)Specimen; J are used principally as insulation, to conserve body heat.
Specimen; K belong to the class Diplopoda
Specimen; L belong to the class Chilopoda.
In tabular form
(i)millipedes are more rounded.
(ii)Millipedes have two sets of legs per segment positioned directly under their body.
(i)centipedes have a flatter body
(ii)Centipedes have one set of legs per segment positioned on the side of their body.
Specimen; M is Grasshopper
Specimen; N is spider
Specimen; O is Larva (house fly)
Specimen; P is Larva ( mosquito)
Specimen; Q Flame of The forest flower
Specimen; R hibicuss flower.
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