Biology 2025 Jamb Examination
Biology 2025 Jamb Examination
Question 1
The process that brings about the cooling effect on the body of mammals is
Cooling in mammals is primarily achieved through sweat excretion. When sweat evaporates from the skin surface, it absorbs latent heat from the body, leading to a reduction in body temperature. This is a key mechanism of thermoregulation.
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Question 2
Which of the following controls protein and enzyme syntheses in the cytoplasm of the cell?
The DNA (Deoxyribonucleic acid) contains the genetic code or 'blueprint' required for the synthesis of proteins and enzymes. While the process of transcription happens in the nucleus, the instructions that ultimately control synthesis in the cytoplasm originate from the DNA.
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Question 3
Use the diagram above to answer the question that follows. The structure labelled I is adapted for
The diagram shows a raptor-like beak (e.g., an eagle or hawk). This strong, curved, and hooked beak is an adaptation for tearing flesh from prey.
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Question 4
A complex feeding relationship between organisms in a habitat that involves transfer of energy in form of food is
A food web is a complex network of interconnected food chains. It represents the multiple feeding relationships and pathways of energy transfer within an ecosystem, whereas a food chain shows only a single, linear path.
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Question 5
One of the characteristics of insect pollinated flowers is
Scented flowers are a characteristic of entomophilous (insect-pollinated) plants. The fragrance, along with bright colors and nectar, serves to attract insects like bees and butterflies to the flower for pollination.
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Question 6
The process by which plants absorb water from the soil through their roots is
Plants absorb water from the soil by osmosis. Water moves from the soil (a region of higher water potential) into the root hair cells (a region of lower water potential) across the semi-permeable cell membrane.
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Question 7
The bright colouration of the flower of a flowering plant is an adaptation for
Bright colors in flowers are an adaptation to attract pollinators (insects or birds). Since pollination is a prerequisite for fertilization and seed formation, this is ultimately an adaptation for reproduction.
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Question 8
Use the diagram above to answer the questions that follow The endocrine gland that is located in the part labelled I is
The pituitary gland is a small, pea-sized gland located at the base of the brain, in a bony hollow called the sella turcica, which is in the head. It is often called the "master gland" because it produces hormones that control many other endocrine glands in the body, including the thyroid and adrenal glands.
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Question 9
One of the components of peripheral nervous system is
The Central Nervous System (CNS) consists of the brain and spinal cord. The Peripheral Nervous System (PNS) consists of all the nerves outside the CNS, including sensory neurones and motor neurones.
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Question 10
When the cotyledons appear above the soil during germination is called
In epigeal germination, the hypocotyl elongates rapidly and arches, pulling the cotyledons above the soil surface. In hypogeal germination, the cotyledons remain below the ground.