NECO Biology Exam 2020 Questions and Answers

NECO Biology Exam 2020 Questions and Answers (Theory and Objectives)



NECO Biology Questions 2022 In this post, I’ll provide you with free access to the NECO Biology objective and theory questions and answers. Additionally, you’ll comprehend how NECO Biology questions are constructed and how to respond to them.


The Senior Secondary Certificate Examination and the General Certificate in Education are administered by Nigeria’s National Examinations Council (NECO) every June/July and December/January, respectively.NECO Physics Questions and Answers 2022/2023 | Essay and Objective.


NECO Biology Question and Answers Essay and OBJ (Expo)

The 2022 NECO Biology expo will be posted here during the NECO Biology examination. Keep checking and reloading this page for the answers.http://NECO-Past-Questions/Biology-


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(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




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.




Male and female gametes or nuclei from separate individuals are fused or joined during sexual reproduction to form a zygote, which eventually develops into an embryo or living being.




(i) biceps (flexor)


(ii) Triceps (extensor)




– The sensory receptor in the skin receives the stimulation when a person touches a hot object.


– The dorsal root/sensory neurone transmits an impulse from the receptor to the spinal cord.


-The motor neurone receives the impulse from the intermediate neuron in the spinal cord.


-The motor neurone then uses the ventral root to transmit the impulses to a muscle effector organ.


– The synapses that connect all of the neurones are where impulses are delivered.


– The muscle contracts when the impulse reaches it, pulling the hand away from the heated object.




(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




(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.






Metamorphosis: This is the name given to the change in form shown by insects and amphibians from the egg stage to the adult stage.




(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




(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)




(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




-The inner ear’s semi-circular canals are in charge of keeping the body balanced when moving in a circle.


– Each of the three semicircular canals is located in a different geometric plane (right angle to each other)


– The gelatinous cupula in one of the semi-circular tubes is set in motion during spinning.


-In order to maintain normal posture, impulses are sent from the stimulated sensory hairs through the auditory nerves to the brain.


– The gelatinous cupula does not immediately cease spinning; rather, it keeps moving for a while.


– This results in the sense of spinning continuing.




(i)Buccal respiration


(ii)Lung respiration


(iii)Skin respiration








(i) The flowers are not attractive


(ii) The pollen grains are not sticky




(i) The flowers are attractive


(ii) The pollen grains are sticky




(i)Parietal placentation.


(ii) Basal placentation.




The lens, the aqueous humour, the cornea, and the vitreous humour all work together to bend light rays coming from an outside source. The lens serves as the precise adjustment that focuses the photons on the retina. Human retinal images are reversed and dimmer than usual. Through the optic nerves, the brain receives the stimulus and interprets it.





(i)Parasitic nutrition




(iii)Carnivorous nutrition







(i) Internal fertilization


(ii) External fertilization




-The zygote splits frequently after fertilization to create an embryo that is made up of the plumule, radicle, and one or more cotyledons.


– The primary endosperm nucleus matures into endosperm, a nutritive tissue that stores nourishment for the growing embryo.


– The antipodal cells and synergids deteriorate


– The ovule transforms to become the seed, and the embryonic tissues produce the seed coat.


-Where air and water enter the seed, the micropyle is still present.


– The ovary develops into the fruit, and the ovarian wall eventually becomes the pericarp, which is the fruit wall.


– The petals, sepals, and stamens wither and drop off, along with the style.




(i) Red blood cells


(ii) White blood cells


(iii) Blood plasma


(iv) Platelets




(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




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







(i)Bush burning








(i)Seasonal migration






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 2021 NECO Biology Questions.


1. Which of the following isn’t a classification of plant? 




(b) Coelenterate.


(c) pteridophyta.


(d) thallophyta.


(e) Spermatophyte.


2. The rigidity of the cell wall of plants is due to the presence of?


(a) Cambium


(b) cellulose


(c) cortex


(d) chloroplast


(e) phloem


3. The structure with the role of transporting of mineral salt from the root to other parts of the plant is?




(b) phloem


(c) pith


(d) sclerenchyma


(e) xylem.


4. One of the following cell organelles traps sunlight energy in plant?




(b) Endoplasmic reticulum


(c) Mitochondrion


(d) Ribosome (e) Vacuole


5. Which of the following conditions aren’t necessary for photosynthesis?


(a) Carbon(iv)oxide.


(b) chlorophyll


(c) light energy


(d) oxygen


(e) water


6. Which of the following organisms carries out photosynthesis?


(a) Amoeba




(c) paramecium


(d) plasmodium


(e) Volvox


7. One of the following is an amphibian?


(a) Fish


(b) Lizard


(c) Rat


(d) Snake


(e) Toad


8. A flower possessing 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 known as?


(a) Chemotropism


(b) geotropism


(c) hydrotropism


(d) phototropism


(e) thigmotropism


10. Which one among the following is a bryophyte?


(a) Bladder wort


(b) Fly trap


(c) Liver wort


(d) Pitcher


(e) Sundew


11. ———— is where cellular respiration occur?


(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. Which of the following has an exoskeleton?


(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. Which among the following is the phylum for Land snail?


(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 known as?


(a) Cleistogamy


(b) dichogamy


(c) homogamy


(d) protandry


(e) protogyny


17. Auxins on plant has the following effects 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 shows 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. One of these is a water soluble vitamin?


(a) A 


(b) C


(c) D


(d) E


(e) K


21. Which among the following isn’t an airborne disease?


(a) Clolera


(b) measles


(c) meningitis


(d) pneumonia


(e) small pox.


22. What is the name given to the excretory organ of insects?


(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.Finger-like structures like ville are found in the?


(a) Large intestine


(b) rectum


(c) small intestine


(d) stomach


(e) tongue.


25. Sperms in mammals are formed in the —–


(a) Cowper’s gland


(b) scrotal sac.


(c) seminal vesicle 


(d) seminiferous tubules


(e) vas deferens


26. One among the following isn’t  a part of the mammalian brain?


(a) Cerebellum


(b) cerebrum


(c) Olfactory lobe


(d) spinal cord


(e) Thalamus


27.Chlorosis in plants is caused by the deficiency of?


(a) Iron


(b) magnesium


(c) nitrogen


(d) potassium


(e) Sulphur


28. One among the following diseases isn’t  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. Excretion in tape worm is done through a structure known as


(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 referred to as


(a) Amino


(b) fatty acids


(c) glycerol


(d) lipids


(e) carbohydrates


34. In the lungs, gaseous exchange occurs at the


(a) Alveolus






(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 shown 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. Where are carnassial teeths found?


(a) dog


(b) cow




(d) man


(e) sheep


41. One among the following bones isn’t part of axial skeleton?


(a) Backbone


(b) Limbs




(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 role 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. Which part of the male reproductive system stores sperm?


(a) Cowper’s gland


(b) epididymis


(c) prostate gland


(d) seminal  vesicle


(e) vas deferens.


46. An organ in bird that is responsible for the grinding of 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. One among the following isn’t a  function of the sympathetic nervous system


(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. One among the following homeostatic mechanisms aren’t carried out by mammals


(a) Excretion


(b) osmoregulation


(c) pH regulation


(d) reproduction


(e) thermoregulation


50.Blood pressure is controlled by the part of the brain that is called?


(a) Cerebellum


(b) cerebrum


(c) corpus callosum


(d) medulla oblongata


(e) pons varolii


51.The deficiency of vitamin—— causes haemorrhage.


(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.Which among the following isn’t a vector?


(a) Black fly


(b) butterfly


(c) housefly


(d) mosquito


(e) tsetse fly


54. Lack 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. One among the following 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 process by which trees are cut down in a forest is referred to as?


(a) Afforestation


(b) deforestation


(c) desertification


(d) forest pruning


(e) re-afforestation        






Attempt any three questions only


1a. Enumerate one role each of the following in photosynthesis


(i) Sunlight


(ii) Chlorophyll


b. Enumerate five types of bones found in the forearm of man


c. List three roles of a worker caste in termitarium


d. Define ecosystem


e. Draw a well labelled diagram (8-10cm long) of the nephron


2a. Explain the following


(i) Gene


(ii) Implantation


(iii) Species


(iv) Saprophytes


b (i) Mention four functions of the mammalian skeleton


(ii) List two muscles that bring about movement of a forearm


(iii) State three digestive enzymes found in the small intestine and state one role of each


3a. (i) List three diseases of the liver


(ii) In a tabular form, mention five differences between plant and animal cells


b. Using annotated diagrams only, illustrate the carbon cycle.


c. (i) State two types of supporting tissues in plant


(ii) Enumerate two characteristics of a reptile


4a. Explain the following terms


(i) Diffusion


(ii) Osmosis


(iii) plasmolysis


b (i) State four effects of overcrowding


(ii) List two methods of conserving wildlife.


(iii) Give two examples of social animals


c (i) Define metamorphosis


(ii) Enumerate two examples of insects that undergo incomplete metamorphosis


(iii) State 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


Crossing will display the F1 generation.

Show the F2 generation using the punnet square approach.

Provide the F1 to F2 phenotypic ratios that were displayed above.


That is all you need to know about the NECO Biology Exam 2022 Questions and Answers (Theory and Objectives). 

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