Biology 2012 Jamb Examination
Biology 2012 Jamb Examination
Question 31
Which of the following is a polysaccharide?
Cellulose is a polysaccharide composed of long chains of glucose units. It forms the structural component of plant cell walls, unlike glucose, sucrose, and maltose, which are simple or disaccharides.
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Question 32
In the kidney of mammals, the site of ultrafiltration is the
Bowman's capsule, along with the glomerulus, forms the renal corpuscle where ultrafiltration occurs. Blood pressure forces water and solutes from the blood into the capsule, starting urine formation.
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Question 33
Which of the following is involved in secondary thickening in plants?
Secondary thickening in plants involves both vascular cambium, which produces secondary xylem and phloem, and cork cambium, which forms protective outer layers, increasing the girth of stems and roots.
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Question 34
An example of a fruit that develops from a single carpel is
A bean develops from a single carpel and is classified as a simple fruit. Other options like tomato and orange develop from multiple carpels or ovary structures.
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Question 35
Plant growth can be artificially stimulated by the addition of
Gibberellins are plant hormones that stimulate growth by promoting cell elongation, breaking seed dormancy, and inducing flowering. They are widely used in agriculture to enhance growth.
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Question 36
Which of the following plant structures lacks a waterproof cuticle?
Roots lack a waterproof cuticle because they need to absorb water and minerals from the soil efficiently. Leaves and stems have cuticles to prevent water loss, but roots require permeability.
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Question 37
In the mammalian male reproductive system, the part that serves as a passage for both urine and semen is the
The urethra carries both urine from the bladder and semen from the reproductive system. The ureter only transports urine, while the bladder stores it, and seminal vesicles produce seminal fluid.
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Question 38
In plants which of the following is required in minute quantities for growth?
Copper is a micronutrient required in very small quantities for plant growth. It is essential for enzyme function and chlorophyll production, unlike potassium and phosphorus which are macronutrients.
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Question 39
Which of the following organisms is both parasitic and autotrophic?
Sundew is a carnivorous plant that performs photosynthesis (autotrophic) but also traps and digests insects (parasitic behavior), allowing it to gain nutrients from animal prey.
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Question 40
A function of the hydrochloric acid produced in the human stomach during digestion is to
Hydrochloric acid in the stomach stops the action of salivary ptyalin (amylase) and provides an acidic environment that activates pepsinogen to pepsin, which is essential for protein digestion.
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