Biology 2021 Jamb Examination
Biology 2021 Jamb Examination
Question 1
Which of the statements below is not characteristic of wind-pollinated flowers?
Wind-pollinated flowers have smooth pollen grains to be easily carried by air currents. Rough, spiny pollen is characteristic of insect-pollinated flowers, which rely on insects for transport.
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Question 2
One of the functions of the xylem is?
Xylem provides structural support to plants while transporting water and dissolved minerals from roots to aerial parts. Its thick lignified walls strengthen stems and help maintain plant rigidity.
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Question 3
Choose the sequence which represents the correct order of organisms in a food chain
In a food chain, energy flows from producers to primary consumers, then to secondary consumers and tertiary consumers. Grass is eaten by grasshopper, then toad, followed by snake, then hawk.
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Question 4
Some of the features of an animal are scales, teeth, nares, and backbone. The animal is likely to be a?
The combination of scales, teeth, nares (nostrils), and a backbone indicates a reptile. Lizards possess all these features, distinguishing them from amphibians, birds, and mammals.
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Question 5
Flatworms and roundworms are said to be invertebrates because?
Flatworms and roundworms lack a vertebral column, meaning they do not possess a backbone. This absence classifies them as invertebrates, despite some being parasitic or of varying sizes.
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Question 6
When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it?
A Spirogyra cell in a hypertonic solution loses water via osmosis because the surrounding solution has a higher solute concentration, causing the cell to shrink and plasmolyze.
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Question 7
Which of the following is NOT regarded as a pollutant on land or in the air?
Nitrogen is a naturally occurring element essential for plant growth and the nitrogen cycle. Smoke, noise, and sulphur dioxide are pollutants that harm organisms and degrade air or land quality.
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Question 8
The initial volume of water poured into a bag of dry soil was 50ml and the amount that drained through was 35ml. The percentage water content of the fully soaked soil is therefore
The percentage water content is calculated as ((50-35)/50)*100 = 30%. This represents the fraction of water retained by the soil after drainage, indicating soil water-holding capacity.
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Question 9
When the original king and queen of termites die, they are replaced by
Secondary reproductives develop from nymphs and assume the role of king or queen. They are nurtured and fed within the colony, ensuring continuity of reproduction and colony stability.
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Question 10
In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to?
Darkening the culture bottle prevents algae from growing in the solution. Algal growth can consume nutrients and obscure results, interfering with experiments on mineral requirements of plants.
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When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because?
Choose the option nearest in meaning to the word or phrase in italics.
The prosecutor was fully able to substantiate the charge.
Direction: Three of the following four number pairs are alike in a certain way and one is different. Find the odd one out ?
| Date | Particulars | Debit (₦) | Credit (₦) | Balance (₦) |
|---|---|---|---|---|
| Jan 1 | Opening balance | - | - | 10,000 |
| Jan 3 | Bashir A. K. | 1,000 | - | 11,000 |
| Jan 10 | Usman A. D. | 1,500 | - | 12,500 |
| Jan 12 | Sule A. S. | 500 | - | 13,000 |
| Jan 20 | Aliyu A. K. | - | 3,000 | 10,000 |
| Jan 30 | X | 1,500 | - | 11,500 |