Biology 2021 Jamb Examination
Biology 2021 Jamb Examination
Question 11
Aged erythrocytes are destroyed in the?
The liver is responsible for breaking down aged or damaged red blood cells. Kupffer cells in the liver phagocytose erythrocytes, recycle their components, and remove hemoglobin and iron.
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Question 12
In the mammalian respiratory system, exchange of gases occurs in the?
Gas exchange occurs in the alveoli, tiny air sacs in the lungs with thin walls and extensive capillary networks, allowing oxygen to diffuse into blood and carbon dioxide to diffuse out.
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Question 13
The villus in the small intestine is significant because it?
Villi are finger-like projections that increase the surface area of the small intestine, enhancing nutrient absorption by providing more contact area for the digested food to enter the bloodstream.
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Question 14
Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution?
Reducing sugars like glucose and maltose react with Benedict's solution, forming a brick-red precipitate when heated. This test is commonly used to identify monosaccharides and some disaccharides.
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Question 15
The blood vessel which carries blood from the alimentary canal to the liver is the?
The hepatic portal vein transports nutrient-rich blood from the digestive tract to the liver for processing, detoxification, and nutrient storage before blood circulates to the rest of the body.
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Question 16
Which of the following is TRUE of the process of conjugation in Paramecium?
During conjugation, the micronucleus undergoes two divisions, exchanging genetic material with another Paramecium. The macronucleus degenerates and is later reconstituted, ensuring genetic variation.
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Question 17
People who suck petrol with their mouths run the risk of increasing in their blood the concentration of
Lead may contaminate petrol, and ingesting it increases its concentration in the blood, causing poisoning, neurological damage, and organ dysfunction. This is a serious health hazard of petrol ingestion.
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Question 18
Which of the following is a measure for the control of bilharzia?
Bilharzia is caused by schistosome parasites using snails as intermediate hosts. Applying molluscicides kills snails in water bodies, reducing disease transmission effectively.
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Question 19
The appendicular skeleton is composed of the pectoral girdle?
The appendicular skeleton includes bones of the limbs and girdles (pectoral and pelvic) that attach limbs to the axial skeleton, facilitating movement and supporting the body structure.
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Question 20
A freshwater plant such as water lily can solve the problem of buoyancy by the possession of?
Aerenchyma are specialized tissues with air spaces that increase buoyancy, allowing aquatic plants like water lilies to float. This adaptation ensures leaves and flowers remain on the water surface for photosynthesis.
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The number of plant species obtained from a population study of a garden is as follows:
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What is the percentage of occurrence of Imperata spp?