2022 NECO GCE Biology (Essay & OBJ) Answers [5th December]

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NECO NOV/DEC 2022 FREE BIOLOGY (BIO) QUESTION AND ANSWER ROOM 

 
Monday 5th December
Biology Paper III & II (Objective & Essay)
2:00pm – 4:30pm

NECO GCE BIOLOGY (ESSAY) ANSWERS 2022:

(1ai)
(Pick any five)
(i) Reproduction is sexual and fertilization is internal/viviparous
(ii) Skin covered with hair/fur or wool
(iii) Have heterodont dentition. i.e. they have different set of teeth
(iv) Have external ear called pinnae
(v) Have a well-developed brain
(vi) Have a welled-developed heart
(vii)    Well-developed sense organs
(viii) Bilaterally symmetrical

(1aii)
DURING INHALATION
-External intercostal muscles contract and internal intercostal muscles relax
- Ribs move up and out pushing the sternum upwards and forward
- Diaphrahm muscles contract and diaphragm flattens
- The processes above increases the volume of the thorax which eventually decreases air pressure in the lungs than the atmospheric pressure
- Decrease in air pressure in the lungs makes atmospheric air rush into the lungs

DURING EXHALATION
- Internal intercostal muscles contract an external intercostal muscles relax
- Ribs move down moving the sternum downwards and inwards
- Diaphragm muscles relax and the diaphragm is raised
- Volume of the thorax decreases and thereby increasing air presuure in the lungs than the atmospheric pressure
- Increased air pressure forces air out of the lungs

(1bi)
(Pick any two)
(i) It is the medium of diffusion of food materials from the maother to the foetus
(ii) It produces hormones including oestrogen and progesterone which maintain pregnancy  
(iii) It serves as the surface for  diffusion  of oxygen from the mother to the foetus
(iv) It is the medium of diffusion of metabolic wastes from the foetus to the mother for elimination

(1bii)
(Pick any Three)
(i) Borgu game reserve
(ii) Yankari game reserve  
(iii) Falgore game reserve  
(iv) Zugurma game reserve

(1biii)
In a tabular form

FERTILIZATION
(Pick any three)
(i) Fertilization can be either internal or external
(ii) Fertilization occurs after pollination
(iii) Fertilization is a genetic and biochemical process
(iv) In fertilization external factors are not requires.
(v) In fertlization pollen tubes are formed for transferring male gametes into an egg

POLLINATION
(Pick any three)
(i) Pollination Is An External Process
(ii) Pollination takes place before fertilization
(iii) Pollination is a physical process
(iv) In pollination external factors are required
(v) In pollination pollen tube is not required

OR

(2ai)
The heart muscles contract, allowing de-oxygenated blood from the right ventricle to pass through the pulmonary valve into the pulmonary artery to the lung capillaries for exchange of oxygen and carbon dioxide. Oxygenated blood from the lungs then return by the pulmonary vein to the left auricle.

(2aii)
(i) It produces genetic variation in the offspring.
(ii) The species can adapt to new environments due to variation, which gives them a survival advantage.
(iii) A disease is less likely to affect all the individuals in a population.
(iv) It allows production of desirable traits

(2bi)
(i) Drying
(ii) Canning
(iii) Heating
(iv) Freezing

(2bii)
(i) By seeking sun or shade or huddling together for warmth.
(ii) By shivering and non-shivering thermogenesis.
(iii) By vessels to the skin can alter an organism's exchange of heat with the environment.
(iv) By sweating and panting, in body temperature regulation.

(2biii)
(i) It improves yield established varieties
(ii) It improves resistance towards biotic and abiotic stresses faced by plant.

(3ai)
A, B, AB, O

(3aii)
The scrotum hangs outside the body because it needs to maintain a slightly lower temperature than the rest of the body. Low temperature enhances sperm formation.

(3aiii)
After the transfer of pollen grains from anther to stigma, the ovary become fertilized. The ovules become seeds and the ovary enlarges to contain them, forming the fruit. The ovary wall becomes the fruit wall or pericarp.

(3bi)
DRAW THE DIAGRAM

Amoeba is a microscopic organism which has fingerlike known as pseudopodia. Nutrition in an Amoeba occurs through a process called phagocytosis. The amoeba extends its pseudopodia around the food and engulfs it. The food is trapped in the food vacuole where it is digested by the digestive enzyme and finally the food is absorbed and distributed all through the body.

(3bii)
(i) Carbon dioxide
(ii) Water
(iii) Sunlight
(iv) Chlorophyll

 

NECO GCE BIOLOGY (ESSAY) QUESTIONS 2022:

 

NECO GCE BIOLOGY (OBJECTIVE) ANSWERS 2022:

1-10: AEACBBABCE
11-20: EAEECEBBDC
21-30: AEBAABEAAD
31-40: ADEBDABDDC
41-50: BACBBEADCD
51-60: ECDDBBDDBC

NECO GCE BIOLOGY (OBJECTIVE) QUESTIONS 2022:

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