NECO 2022 - BIOLOGY  ANSWER

BIOLOGY OBJ
1-10: DDEDAAEACC
11-20: DEECCBBBAB
21-30: EEADEAEAEA
31-40: BCCBCCBADE
41-50: DCCBCBECCC
51-60: EABBCADBDE


ANSWER ONLY THREE QUESTIONS

(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)
(i)When one touches a hot object, the sensory receptor in the skin receives the stimulus
(ii)An impulse is transmitted from the receptor to the spinal cord, via the dorsal root/sensory neurone
(iii)The intermediate neurone in the spinal cord passes on the impulse to the motor neurone
(iv)The motor neurone then sends the impulses to an effector organ (muscle) via the ventral root
(v)All the neurones are linked by synapses across which impulses are sent
(vi)The muscle upon receiving the impulse contracts causing the hand to be withdrawn from the hot object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.

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(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)
Endolymph in the inner ear/semi circular cannals continues to move, causing sensory hair sensory cells to be stimulated. Impulses reaching the cerebellum through the auditory nerves show that the person is still spinning. The brain interprets the body as still moving and confusion is imposed on the receptors sensitive to position, giving the person an impression of dizziness.

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(3)



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(4)



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(5)