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NECO GCE Biology Essay Questions and Answers 2023
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Neco gce biology Essay and Objective answer 2022
Q1ai) List five features of the class mammalia
Answer: (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
Q1aii). Describe the process of inhalation and exhalation in man during respiration
DURING INHALATION
(i)External intercostal muscles contract and internal intercostal muscles relax
(ii) Ribs move up and out pushing the sternum upwards and forward
(iii) Diaphrahm muscles contract and diaphragm flattens
(iv) The processes above increases the volume of the thorax which eventually decreases air pressure in the lungs than the atmospheric pressure
(v) Decrease in air pressure in the lungs makes atmospheric air rush into the lungs
DURING EXHALATION
(i) Internal intercostal muscles contract an external intercostal muscles relax
(ii) Ribs move down moving the sternum downwards and inwards
(iii) Diaphragm muscles relax and the diaphragm is raised
(iv) Volume of the thorax decreases and thereby increasing air presuure in the lungs than the atmospheric pressure
(v) Increased air pressure forces air out of the lungs
Q1bi). Enumerate 2 role of placenta during pregnancy
The 2 role of placenta during pregnancy are as follow:
(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). State three game reserves in Nigeria
(i) Borgu game reserve
(ii) Yankari game reserve
(iii) Falgore game reserve
(iv) Zugurma game reserve
Q(1biii). Give three differences between fertilization and pollination
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
(2ai). Explain The process of Pulmonary circulation in mammal
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.
Q(2aii). List four advantages of sexual reproduction
(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
Q(2bi). Outline four method of food preservation
(i)Drying
(ii)Canning
(iii)Heating
(iv)Freezing
Q(2bii). List four methods by which an animal body regulates overcooling
(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.
Q(2biii). Enumerate 2 advantages of cross breeding in plants
(i)improve yield established varieties
(ii)improve resistance towards biotic and abiotic stresses faced by plant.
Q(3ai). If a man with blood group AB is involved in an accident and requires blood transfusion, name the blood group of compatible donor
Answer is: 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
BIOLOGY OBJ
01-10: CBACBBABCA
11-20: EDEAAECCBC
21:30: AEEAABEEAE
31-40: AEEBDABDDC
41-50: ABCBBEADCD
51-60: ECDDBBDABA
COMPLETED
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