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⚠️ IMPORTANT NOTICE
This page contains the NECO Biology answers for Anambra State only.
If you are writing the Biology exam in Anambra State, you are on the correct page.
⚠️ IMPORTANT:
If you are not writing the NECO Biology exam in Anambra State, do not use these answers. They may not match your question paper.
If you are not writing the NECO Biology exam in Anambra State, do not use these answers. They may not match your question paper.
NECO Biology TYPE B OBJ
01-10: AECBAACADE
11-20: ECBDEBCDEA
21-30: CADBCDEBBA
31-40: AACEBDACBC
41-50: DECBEBEDAE
51-60: AAAEBDCBBB
Solved by BrightScoreHub
Completed!!!
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BIOLOGY ESSAY
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NUMBER ONE
(1ai)
Tolerance is the ability of an organism to withstand changes in environmental conditions within certain limits
(1aii)
(i) Oxygen
(ii) Carbon dioxide
(iii) Digested food substances
(iv) Hormones
(1b)
(i) Prophase
(ii) Metaphase
(iii) Anaphase
(iv) Telophase
(1c)
(i) They live in colonies with division of labour among workers, soldiers and reproductive castes
(ii) They build underground tunnels and mud tubes to protect themselves from predators and prevent water loss
(iii) They are mainly nocturnal, foraging at night to avoid heat and predators
(iv) Soldier termites defend the colony using their strong mandibles or chemical secretions
(v) Workers cooperate in collecting food, feeding other members of the colony and maintaining the nest
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NUMBER TWO
(2ai)
[PICK ANY 5]
(i) Lungs
(ii) kidney
(iii) skin
(iv) liver
(v)nephridia
(vi)contractile vacuole
(vii) flame cells
(viii) Malpighian tubules.
(2aii)
[PICK ANY ONE ]
Lungs – Man.
Kidney – Man.
Skin – Man.
Liver – Man.
Nephridia – Earthworm.
Contractile vacuole – Paramecium.
Flame cells – Tapeworm.
Malpighian tubules – Insects.
(2bi)
(i) Both possess structures for filtering excretory products.
(ii) Both are well supplied with blood.
(2bii)
| Mammals | Earthworm |
|---|---|
| (i) Not ciliated. | (i) Ciliated. |
| (ii) Has no special tissue for storing waste products. | (ii) Has special tissues for storing some excretory products. |
| (iii) Has only one outlet for discharging waste. | (iii) Has an outlet in each segment, hence possesses many outlets. |
(2c)
Each stoma is enclosed by guard cells. The guard cells contain chloroplasts and are elastic. During photosynthesis, sugar is produced, increasing the concentration of the cell sap. Water enters the guard cells by osmosis, making them turgid and causing the stomata to open. At night, the sugar is converted to starch, reducing the osmotic concentration of the guard cells. Water leaves the guard cells by osmosis, making them flaccid and causing the stomata to close.
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NUMBER THREE
(3ai)
=Protein=
(i) Carbon
(ii) Hydrogen
(iii) Oxygen
=Carbohydrate=
(i) Carbon
(ii) Hydrogen
(iii) Oxygen
(3aii)
(3aiii)
(i) Birth rate (Natality)
(ii) Death rate (Mortality)
(3bi)
Swarming is the movement of a large number of social insects such as bees or termites from an old colony to establish a new colony
(3bii)
Epidemic is the rapid spread of a disease affecting many people in a particular area within a short period
(3ci)
Parthenocarpy is the development of a fruit without fertilization, resulting in a seedless fruit
(3cii)
(i) Condom
(ii) Abstinence
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NUMBER FOUR
(4ai)
(i) They are protein in nature
(ii) They are specific in their action
(iii) They are not used up during the reactions they catalyse
(4aii)
Pupil: Regulates the amount of light entering the eye
Conjunctiva: Protects and lubricates the front part of the eye
Cornea: Refracts light rays entering the eye and protects the eye
BIOLOGY
NUMBER FOUR
(4bi)
| Transpiration | Excretion |
|---|---|
| (i) Loss of water vapour from the aerial parts of plants | (i) Removal of metabolic waste products from living organisms |
| (ii) Occurs mainly through stomata, lenticels and cuticle | (ii) Occurs through excretory organs such as kidneys, lungs and skin |
| (iii) Removes mainly excess water | (iii) Removes wastes such as urea, carbon dioxide and excess salts |
(4bii)
(i) Shoulder joint
(ii) Hip joint
(4c)
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NUMBER FIVE
(5ai)
| Root | Stem |
|---|---|
| (i) Usually grows downward into the soil | (i) Usually grows upward above the soil |
| (ii) Has root hairs but no nodes or internodes | (ii) Has nodes, internodes and buds but no root hairs |
| (iii) Absorbs water and mineral salts from the soil | (iii) Supports leaves, flowers and fruits and transports materials |
(5aii)
(i) It has a large, thick centrum
(ii) It has a short and stout spinous process
(iii) It possesses broad transverse processes for muscle attachment
(5bi)
(i) Collenchyma
(ii) Sclerenchyma
(iii) Xylem
(5bii)
Haemophilia: A hereditary disorder in which blood fails to clot normally
Mutation: A sudden heritable change in the genetic material of an organism
Sex-linked character: A characteristic controlled by genes located on the sex chromosomes
(5ci)
(i) Crop farming.
(ii) Livestock farming.
(iii) Mixed farming
(5cii)
(i) Drying
(ii) Smoking
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QUESTIONS PAPERS
