Biology 2018 Jamb Examination
Biology 2018 Jamb Examination
Question 11
Blood circulation in a mammal is said to be double because
Mammalian blood circulation is called double circulation because blood passes twice through the heart in a complete circuit: once through the pulmonary circuit to the lungs for oxygenation, and once through the systemic circuit to deliver oxygen to the body.
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Question 12
Examples of animals with mammary glands include the following except
Mammary glands are characteristic of mammals, which produce milk to feed their young. Hen is a bird and does not have mammary glands, so it is the exception among the listed animals.
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Question 13
The hygrometer is used for measuring
A hygrometer is an instrument used to measure the relative humidity of the air, which indicates the amount of moisture present in the atmosphere relative to the maximum moisture the air can hold at a given temperature.
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Question 14
Mineral salts can be absorbed into roots by
Mineral salts are absorbed into plant roots primarily through diffusion and active transport. Diffusion allows ions to move along concentration gradients, while active transport requires energy to move ions against their gradients into root cells.
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Question 15
Which is an animal without red blood cells?
Earthworms lack red blood cells. They have a colorless blood that contains hemoglobin dissolved directly in the plasma, unlike vertebrates where hemoglobin is carried inside red blood cells for oxygen transport.
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Question 16
The temporary union of two organisms and the exchange of micronuclear elements is called
Conjugation is a form of sexual reproduction in unicellular organisms like paramecium, where two individuals temporarily unite and exchange micronuclear material, allowing for genetic recombination without producing offspring immediately.
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Question 17
A plant tissue that carries water and mineral salt is
Xylem is the vascular tissue responsible for transporting water and dissolved mineral salts from the roots to other parts of the plant. It consists of vessels, tracheids, and xylem fibers that provide structural support as well.
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Question 18
Which of the following relationship involves only one organism?
Saprophytism is a relationship where an organism, such as fungi or bacteria, feeds on dead or decaying organic matter independently. Unlike parasitism or symbiosis, it involves only the saprophyte and not a living host organism.
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Question 19
The outer membrane that covers the brain is
The dura mater is the tough, outermost membrane that surrounds and protects the brain and spinal cord. It provides a durable protective layer against mechanical injury and supports venous sinuses.
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Question 20
The process in which plant uses sunlight to synthesize nutrients from carbon dioxide and water is called
Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen. This process provides energy and organic molecules essential for growth, development, and survival of plants.
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