NECO 2021 - BIOLOGY ANSWER

BIOLOGY OBJ
1-10: ECCECDBBBD
11-20: BCAEBECEEB
21-30: EECDCDCECE
31-40: ADBDCCCCBA
41-50: CDDDEADCEA
51-60: EBDADACBBB


(1a)
Animals move from one place to another:
(i) In search of food.
(ii) In search of mates.
(iii) In search of shelter.
(iv) To escape from enemies or predators.

(1b)
(i) Phloem conducts food substances downward to other tissues in the root of plants.
(ii) Lead helps plants to transpire and undergo photosynthesis.
(iii) Xylem transports water and dissolved mineral salts upwards through the vascular bundle.
(iv) The primary function of a flower is for reproduction

(1ci)
(i) Small or no leaves to prevent evaporation.
(ii) Thorns for protection against animals seeking stored water.
(iii) Ability to quickly absorb water whenever available.

(1cii)
(i) It ensures that the diploid condition of the cell is retained from generation to generation.
(ii) As cells undergo miotic division, growth occurs.

(1di)
Light rays from an object enter the eye through the cornea. The light rays are refracted by the convex cornea and passed through the aqueous humor which further bends the light rays before entering the lens through the pupil. The lens further bends the light rays and focuses them on the retina.
The light are converted into electrical impulses which are sent through the optic nerve to the optic lobes of the brain where they are correctly interpreted.

(1dii)
(i) Evidence from comparative anatomy
(ii) Evidence from vestigial organs.
(iii) Evidence from fossils.





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(2a)
(i) Bony sockets
(ii) Eye brows

(2bi)
Excretion is the removal of waste products of metabolism which are harmful or would in time interfere with normal functions of organisms.

(2bii)
Competition is a biological interaction between organisms of the same species or different species for the same resources which are in limited supply such as food, space or mates.

(2biii)
Deforestation is the cutting down of forest trees on a land.

(2c)
[Click here for the Image]

(2d)
(i) Canning
(ii) Refrigeration
(iii) Dehydration
(iv) Pasteurization




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(3a)
(i) Meiosis - Four daughter cells.
(ii) Mitosis - Two daughter cells.

(3bi)
(i) It permits variability of individuals, which enhances survival in new environment.
(ii) It permits new species formation.
(iii) It permits the production of hybrids for some desirable traits.

(3bii)
The relationship between Remora and Shark is commensalism. Remora attaches itself to the underside of a shark and feeds on scraps of shark's food. The shark neither benefits nor suffers in any respect.

(3ci)
Symptoms of covid-19 are:
[Pick Any Three]
(i) Fever
(ii) Dry cough
(iii) Tiredness
(iv) Difficulty in breathing.

(3cii)
Renal vein carries blood from the kidney to the inferior vena cava.

(3di)
Ecological niche at a species refers to its life style, how it lives, what it does, or how it interacts with other members of its habitat.

(3dii)
Population density is the member of individuals per unit area or volume at a particular time eg the number of human inhabitants per square kilometre.

(3diii)
A climax community the final stage of biotic succession attainable by a plant community in an area under the environmental conditions present at a particular time. The species composition of the climax community remains the same because all the species present successfully reproduce themselves and invading species fail to gain a foothold.




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