Biology NECO Questions 2023. In this post, I will provide you with free access to the NECO Biology theory and objective questions and answers. To top it all off, you’ll learn all you need to know to ace the NECO Biology exam.
In Nigeria, the Senior Secondary Certificate Examination is given in June/July, and the General Certificate in Education is given in December/January, both by the National Examinations Council (NECO).
NECO Biology Question and Answers Essay and OBJ (Expo)
The 2023 NECO Biology expo will be posted here during the NECO Biology examination. Keep checking and reloading this page for the answers.
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The aforementioned questions are likely NECO Biology repeated questions and answers rather than the 2023 Further Mathematics questions and answers.
These are practise questions. On the day of the NECO Biology examination, the 2023 NECO Biology questions and answers will be available on this page. Continue to check and refresh/reload this page for latest answers.
NECO Biology 2022 Answers
Note: The answers below are for the 2022 NECO exam.
1-10: DDEDBAEACC
11-20: DEECCBBBAB
21-30: EEADEAEAEA
31-40: BCCBCCBADE
41-50: DCCBCBECDC
51-60: EABBCCBADE
(1ai)
(i) Setting up of national park and gardens to save wildlife in their natural environment.
(ii) Poaching i.e. uncontrolled and illegal killing of game should be prevented.
(iii) Avoiding the use of pesticides that may kill off many animals
(vi) Prohibiting deforestation and encouraging afforestation
(1ii)
Sexual reproduction involves the fusion of two gametes – male and female gametes during fertilization to form a zygote which develops into a new organism. It involves organisms of the same species.
Or
Sexual reproduction is the fusion or joining of male and female gametes or nuclei from different individual to form a zygote which later develops into an embryo or organism.
(1aiii)
(i) biceps (flexor)
(ii) Triceps (extensor)
(1b)
– When one touches a hot object, the sensory receptor in the skin receives the stimulus
– An impulse is transmitted from the receptor to the spinal cord, via the dorsal root/sensory neurone
– The intermediate neurone in the spinal cord passes on the impulse to the motor neurone
– The motor neurone then sends the impulses to an effector organ (muscle) via the ventral root
– All the neurones are linked by synapses across which impulses are sent
– The muscle upon receiving the impulse contracts causing the hand to be withdrawn from the hot object
(1ci)
(Pick Any Three)
(i) It provides water for photosynthesis
(ii) To get rid of excess water in the plant
(iii) It helps plants to continually draw water from the soil into their stem and leaves.
(iv) Some evaporation of water uses latent energy from plants and therefore keeps the plant cool
(v) It helps in the transport of mineral salts from soil to leaves and growing points of the plant
(1cii)
(i) Growing of cover crops like grasses, sweet potato which covers the surface of the soil
(ii) Contour ploughing: ploughing along the contours of a slope to reduce the speed of runoff water.
(NUMBER TWO)
(2ai)
Metamorphosis: This is the name given to the change in form shown by insects and amphibians from the egg stage to the adult stage.
(2aii)
(Pick Any Four)
(i) It regulate sex drive (libido)
(ii) It helps in the production of sperm
(iii) It helps in the production of red blood cells
(iv) It is responsible for muscle mass and strength
(v) Cause an increase in bone mass
(vi) Responsible for fat distribution
(2aiii)
(Pick Any Four)
(i) It deaminates excess amino acid to urea
(ii) It stores iron from broken down cells
(iii) It detoxified poisonous substances and sent to the kidney for excretions
(iv) It supplies heat to the body by its metabolic reactions
(v) It also store fats and releases it at controlled rates into the blood when the need arises
(vi) It stores and releases minerals (iron, copper and potassium and vitamins (A, D and B12)
(2bi)
(Pick Any Three)
(i) Oxygen (only in the day)
(ii) Carbon dioxide (only at night)
(iii) Water
(iv) Tannins
(v) Alkaloids
(vi) Resins
(vii) Latex
(viii) Gum
(2bii)
– The semi-circular canals in the inner ear are responsible for the maintenance of balance with respect to circular motion.
– There are three semi-circular canals and each is found in one of the geometrical planes (right angle to each other)
– During spinning, the gelatinous cupula in one of the semi-circular canals is set in motion.
– This stimulates the sensory hairs, and impulses are sent through the auditory nerves to the brain for proper body posture.
– When one stops spinning, the gelatinous cupula does not stop moving instantly but continues to move for some time
– This cause the continue feeling of the sensation of spinning
(3ai)
(i)Buccal respiration
(ii)Lung respiration
(iii)Skin respiration
(3aii)
TABULATE PLEASE
=WIND POLLINATED FLOWERS=
(i) The flowers are not attractive
(ii) The pollen grains are not sticky
=INSECT POLLINATED FLOWERS=
(i) The flowers are attractive
(ii) The pollen grains are sticky
(3aiii)
(i)Parietal placentation.
(ii) Basal placentation.
(3bi)
Light rays from an external object is refracted by the cornea, aqueous humour, the lens and the vitreous humour. The lens act as the fine adjustment bringing the rays to a focus on the retina. The image formed on the retina of human are inverted and diminished. The brain receives the stimulus via the optic nerves and then interprete it.
(3bii)
(i)Parasitic nutrition
(ii)Symbiosis
(iii)Carnivorous nutrition
4(ai)
(4aii)
(i) Internal fertilization
(ii) External fertilization
(4bi)
– After fertilization, the zygote divides repeatedly and develops into an embryo which consists of the plumule, radicle and one or two cotyledons.
– The primary endosperm nucleus develops into a nutritive tissue called endosperm, which stores food used by the developing embryo
– The synergids and the antipodal cells degenerate
– The ovule changes to form the seed and the interguments form the seed coat
– The micropyle remains where air and water enter the seed.
– The ovary develop into the fruit and the ovary wall forms the fruit wall called the pericarp.
– The style shrivels off, the petals, sepals and the stamens wither and fall off
(4bii)
(i) Red blood cells
(ii) White blood cells
(iii) Blood plasma
(iv) Platelets
(5ai)
(i)They are proteinous in nature
(ii) They speed up the rate of chemical reaction
(iii) They are organic catalyst
(iv) They are specific in function
(5aii)
Mendel’s first law also known as the law of segregation of genes states that during gamete formation, two alleles at a gene locus segregate from each other and each gamete has an equal probability of containing either allele
(5aiii)
(5bi)
(i)Bush burning
(ii)Overcropping
(iii)Overgrazing
(5bii)
(i)Seasonal migration
(ii)Pairing
(iii)Territoriality
The 2022 NECO Biology answers will soon be posted, wait patiently.
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The questions below are the NECO past questions and answers that will help you in your 2023 NECO Biology Questions.
1. Plants are classified into the following classes except
(a)Bryophyte.
(b) Coelenterate.
(c) pteridophyta.
(d) thallophyta.
(e) Spermatophyte.
2. The cell wall of plants is rigid due to the presence of?
(a) Cambium
(b) cellulose
(c) cortex
(d) chloroplast
(e) phloem
3. The structure responsible for the transportation of mineral salt from the root to other parts of the plant is?
(a)Collenchyma
(b) phloem
(c) pith
(d) sclerenchyma
(e) xylem.
4. Which of the following cell organelles traps sunlight energy in plant?
(a)Chloroplast
(b) Endoplasmic reticulum
(c) Mitochondrion
(d) Ribosome (e) Vacuole
5. The following conditions are necessary for photosynthesis except
(a) Carbon(iv)oxide.
(b) chlorophyll
(c) light energy
(d) oxygen
(e) water
6. Which of the following organisms carries out photosynthesis?
(a) Amoeba
(b)Euglena
(c) paramecium
(d) plasmodium
(e) Volvox
7. Which of these is an amphibian?
(a) Fish
(b) Lizard
(c) Rat
(d) Snake
(e) Toad
8. A flower with two or more fused carpels is called
(a) Apocarpous
(b) monocarpous
(c) polycarpous
(d) pistillate
(e) syncarpous
9. The response of plants to the stimulus of touch is called?
(a) Chemotropism
(b) geotropism
(c) hydrotropism
(d) phototropism
(e) thigmotropism
10. Which of the following is a bryophyte?
(a) Bladder wort
(b) Fly trap
(c) Liver wort
(d) Pitcher
(e) Sundew
11. Cellular respiration occurs in the
(a) Chloroplast
(b) endoplasmic reticulum
(c) food vacuole
(d) mitochondrion
(e) nucleus
12. In a moss plant, spores are produced in the
(a) Capsule
(b) leaf
(c) rhizoid
(d) seta
(e) stalk
13. Exoskeleton is a characteristic feature of
(a) Amoeba
(b) earthworm
(c) hydra
(d) millipede
(e) tapeworm
14. Which of the following influences growth in plants?
(a) Acetic acid
(b) Auxins
(c) Chlorophyll
(d) Ethylene
(e) Latex
15. Land snail belongs to the phylum
(a) Annelida
(b) Arthropoda
(c) Echinodermata
(d) Mollusca
(e) nematode
16. The opening of the anthers and stigmas of a bisexual flower at the same time is called
(a) Cleistogamy
(b) dichogamy
(c) homogamy
(d) protandry
(e) protogyny
17. The following are the effect of auxins on plant except in
(a) Flowering
(b) fruiting without fertilization
(c) ripening of fruits
(d) root formation
(e) stem elongation
Use the diagram below to answer questions 18 and 19.
18. The diagram represents the internal structure of a
(a) Flower
(b) fruit
(c) leaf
(d) root
(e) stem
19. The part labeled I is the
(a) Cortex
(b) endodermis
(c) phloem (d) root hair (e) xylem
20. Which of these is a water soluble vitamin?
(a) A
(b) C
(c) D
(d) E
(e) K
21. The following diseases are airborne except
(a) Clolera
(b) measles
(c) meningitis
(d) pneumonia
(e) small pox.
22. The excretory organ of insects is called
(a) Contractile vacuole
(b) flame cell
(c) kidney
(d) malphighian tubule
(e) nephridium
23. Which of these animals undergo metamorphosis
(a) Fish
(b) fowl
(c) lizard
(d) Rat
(e) Toad
24. Villi are finger-like structures found in the
(a) Large intestine
(b) rectum
(c) small intestine
(d) stomach
(e) tongue.
25. In mammals, sperms are formed in the
(a) Cowper’s gland
(b) scrotal sac.
(c) seminal vesicle
(d) seminiferous tubules
(e) vas deferens
26. Which of the following is not a part of the mammalian brain?
(a) Cerebellum
(b) cerebrum
(c) Olfactory lobe
(d) spinal cord
(e) Thalamus
27. In plant, Chlorosis is caused by the deficiency of
(a) Iron
(b) magnesium
(c) nitrogen
(d) potassium
(e) Sulphur
28. Which of the following diseases is not sexually transmitted
(a) AIDS
(b) Hepatitis
(c) Herpes
(d) influenza
(e) Syphilis
29. Which of the following is not a caste in a termitarium.
(a) Drones
(b) king
(c) Queen
(d) soldiers
(e) workers
30. The structure responsible for excretion in tape worm is called
(a) Cell membrane
(b) contractile vacuole
(c) flame cell
(d) malphigian tubule
(e) nephridium
31. The mode of nutrition of mushroom is
(a) autotrophic
(b) epiphytic
(c) parasitic
(d) saprophytic
(e) symbiotic
32. The earthworm is an example of
(a) Annelida
(b) Coelenterata
(c) Mollusca
(d) nematoda
(e) Platyhelminthes
33. Fat and oil are also known as
(a) Amino
(b) fatty acids
(c) glycerol
(d) lipids
(e) carbohydrates
34. Gaseous exchange in the lungs occurs at the
(a) Alveolus
(b)bronchus
(c)bronchiole
(d) larynx
(e) trachea
35. The following are pigment except
(a) Auxin
(b) chlorophyll
(c) chromatophores
(d) haemoglobin
(e) melanin
Use the diagram below to answer questions 36 – 38.
36. The type of placentation shown above is found in
(a) cana lily
(b) orange
(c) pawpaw
(d) pride of Barbados
(e) sunflower
37. the part labeled x is the
(a) ovule
(b) petal
(c) placenta
(d) sepal
(e) stamen
38. the type of placentation represented in the diagram is
(a) axile
(b) basal
(c) free central
(d) marginal
(e) parietal
39. the growth that occurs at the tip of shoot and root is called
(a) allometric
(b) apical
(c) isometric
(d) primary
(e) secondary
40. carnassial teeth are found in
(a) dog
(b) cow
(c)goat
(d) man
(e) sheep
41. Which of the following bones is not a part of axial skeleton?
(a) Backbone
(b) Limbs
(c)Ribs
(d) Skull
(e) Sternum
Use the diagram below to answer questions 42 and 43
42. The part labeled ii is the
(a) Bone
(b) hyaline cartilage
(c) ligament
(d) synovial cavity
(e) synovial membrane
43. The function of the part labeled iii is to
(a) Soften the bones
(b) join bones together
(c) lubricate joints
(d) protect bones from wearing
(e) reduce friction at joints
44. The part that supplies food and oxygen to the eye is
(a) Choroids
(b) cornea
(c) lens
(d) pupil
(e) retina
45. The part of the male reproductive system that stores sperm is
(a) Cowper’s gland
(b) epididymis
(c) prostate gland
(d) seminal vesicle
(e) vas deferens.
46. An organ in bird that grinds its food is
(a) Caecum
(b) crop
(c) gizzard
(d) kidney
(e) liver
47. Which of the following animals exhibit basking
(a) Cat
(b) Cow
(c) Duck
(d) Eagle
(e) Lizard
48. The following are functions of the sympathetic nervous system except
(a) Dilation of pupil of eye.
(b) inhibition of saliva secretion
(c) reduction of blood pressure
(d) reduction of urine output
(e) stimulation of ejaculation
49. The following homeostatic mechanisms are carried out by mammals except
(a) Excretion
(b) osmoregulation
(c) pH regulation
(d) reproduction
(e) thermoregulation
50. Part of the brain that controls blood pressure is called
(a) Cerebellum
(b) cerebrum
(c) corpus callosum
(d) medulla oblongata
(e) pons varolii
51. Haemorrhage is caused due to the deficiency of vitamin
(a) A
(b) C
(c) D
(d) E
(e) K
52. The control method of pests using predators is called
(a) Biological
(b) chemical
(c) cultural
(d) mechanical
(e) physical
53. The following are vectors except
(a) Black fly
(b) butterfly
(c) housefly
(d) mosquito
(e) tsetse fly
54. The deficiency of proteins in a developing child result in
(a) Beri beri
(b) kwashiorkor
(c) night blindness
(d) rickets
(e) scurvy
55. The theory of “use and disuse” of body parts was propounded by
(a) Carl Linneaus
(b) Charles Darwin
(c) Gregor Mendel
(d) Jean Lamarck
(e) Robert Hooke
56. The knowledge of heredity and variation are not required in
(a) Blood transfusion
(b) crime detection
(c) determination of paternity
(d) longevity
(e) marriage
57. Which of these is not a pollutant
(a) Carbon dioxide
(b) Lead oxide
(c) Nitrogen gas
(d) Nitrogen oxide
(e) sulphur dioxide
58. The topmost layer of a typical soil profile is
(a) Clay
(b) coarse sand
(c) fine sand
(d) gravel
(e) humus
59. Plants that survive in marine habitats are called
(a) Halophytes
(b) hydrophytes
(c) mesophytes
(d) saprophytes
(e) xerophytes
60. The felling of trees in a forest is called
(a) Afforestation
(b) deforestation
(c) desertification
(d) forest pruning
(e) re-afforestation
PAPER II
ESSAY
Answer any three questions only
1a. State one role each of the following in photosynthesis
(i) Sunlight
(ii) Chlorophyll
b. List five types of bones found in the forearm of man
c. Mention three functions of a worker caste in termitarium
d. Define ecosystem
e. Draw a well labelled diagram (8-10cm long) of the nephron
2a. Define the following
(i) Gene
(ii) Implantation
(iii) Species
(iv) Saprophytes
b (i) State four functions of the mammalian skeleton
(ii) Mention two muscles that bring about movement of a forearm
(iii) Name three digestive enzymes found in the small intestine and state one function of each
3a. (i) Mention three diseases of the liver
(ii) In a tabular form, state five differences between plant and animal cells
b. Using annotated diagrams only, illustrate the carbon cycle.
c. (i) List two types of supporting tissues in plant
(ii) Give two characteristics of a reptile
4a. Define the following terms
(i) Diffusion
(ii) Osmosis
(iii) plasmolysis
b (i) State four effects of overcrowding
(ii) mention two ways of conserving wildlife.
(iii) Give two examples of social animals
c (i) Define metamorphosis
(ii) List two examples of insects that undergo incomplete metamorphosis
(iii) Give two examples of a berry fruit
5a. (i) Draw a well labelled diagram (8-10cm long) of the human alimentary canal
(ii) Complete the table below
| Part of digestive system | Enzymes present | |
| 1 | Mouth | |
| 2 | Renin | |
| 3 | Small intestine |
b. T T and t t are monohybrid plants representing tallness and shortness respectively
- By means of crossing, show the F1 generation
- Using punnet square method, show the F2 generation
- Give the phenotypic ratio of the F1 and F2 generations shown above
That’s all about NECO Biology Questions and Answers for 2022 (Theory and Objectives). If you have any questions, kindly drop your question in the comment box.
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