Biology 2018 Jamb Examination
Biology 2018 Jamb Examination
Question 31
What is the function of trichocyst in paramecium?
Trichocysts are specialized organelles in paramecium that function in defense. They can discharge long, thin filaments to deter predators or anchor the organism. This mechanism helps protect the paramecium from potential threats in its environment.
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Question 32
Man can contact tapeworm through
Humans can contract tapeworm infections primarily by ingesting undercooked or raw meat containing tapeworm larvae. Proper cooking kills the larvae, preventing infection, while direct contact or breathing does not transmit the parasite.
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Question 33
An example of a radially symmetrical organism is
Hydra exhibits radial symmetry, meaning its body can be divided into similar halves along multiple planes passing through its central axis. This symmetry is typical of cnidarians, allowing equal interaction with the environment from all directions.
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Question 34
Maltose is a combination of glucose and
Maltose is a disaccharide composed of two glucose molecules linked by a glycosidic bond. It is formed during the digestion of starch and can be broken down by the enzyme maltase into two glucose molecules for absorption.
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Question 35
The vitamin which is important in the formation of the retina pigment is
Vitamin A is essential for the formation of rhodopsin, a pigment in the retina responsible for vision in low-light conditions. Deficiency in vitamin A can lead to night blindness and other eye-related disorders.
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Question 36
In the egg of a bird, the embryo is located in the
The embryo in a bird egg is located on the yolk, which serves as the primary source of nutrients for its development. The yolk contains proteins, fats, and other essential compounds to sustain the growing embryo.
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Question 37
The greatest amount of energy would be obtained by the oxidation of 100kg of
Butter contains a high proportion of fats, which yield more energy per gram compared to carbohydrates or proteins. Oxidation of 100 kg of butter releases the greatest amount of energy due to the high caloric density of fats.
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Question 38
Ozone hole refers to
The ozone hole refers to the decrease in thickness of the ozone layer in the stratosphere. This thinning allows more harmful ultraviolet radiation to reach the Earth's surface, contributing to environmental and health issues.
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Question 39
Accessory material in a chicken egg include the following except
The germinal disc is the part of the egg where the embryo develops and is not considered accessory material. Accessory materials like albumen, shell membrane, and shell support the embryo by providing protection, nutrients, and cushioning.
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Question 40
Swollen, bleeding gums are another common sign of which vitamin?
Swollen and bleeding gums are classic symptoms of vitamin C deficiency, also known as scurvy. Vitamin C is essential for collagen synthesis, which maintains the strength and integrity of connective tissues, including gums.
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