ASVAB Study GuideGeneral Science Practice Test 3
Tap an answer to check it instantly and read the explanation. 10 questions: 3 easy, 4 medium and 3 hard.
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Question 1 easy
Which organ system is primarily responsible for filtering wastes from the blood and excreting them as urine?
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Correct answer: C — urinary (renal)
The urinary system (renal system), consisting of the kidneys, ureters, bladder, and urethra, filters waste products from the blood and produces urine for excretion.
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Question 2 easy
What is the primary green pigment in plants that absorbs light energy to drive photosynthesis?
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Correct answer: B — chlorophyll
Chlorophyll is the green pigment found in chloroplasts that absorbs light (mainly blue and red wavelengths) to power the light-dependent reactions of photosynthesis.
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Question 3 medium
Which body system includes vital organs such as the spleen, thymus, and lymph nodes, playing a key role in defending the body against pathogens?
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Correct answer: B — immune
The immune system (and lymphatic system) includes organs like the spleen, thymus, and lymph nodes, which produce and house white blood cells to protect the body from infections.
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Question 4 easy
Which cellular organelle houses the cell's genetic material (DNA) and directs cellular activities?
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Correct answer: C — nucleus
The nucleus is known as the control center of the cell because it contains chromosomes made of DNA, which store genetic instructions for protein synthesis and cellular function.
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Question 5 medium
What biological term describes the process by which living organisms regulate their internal physiological environment to maintain a stable, constant state?
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Correct answer: B — homeostasis
Homeostasis refers to the self-regulating process by which an organism maintains internal stability (such as constant body temperature or pH) despite external environmental changes.
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Question 6 medium
Which specialized type of involuntary striated muscle makes up the thick muscular walls of the heart?
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Correct answer: B — cardiac
Cardiac muscle is a specialized, involuntary striated muscle tissue found exclusively in the heart, designed to contract rhythmically and tirelessly throughout a lifetime.
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Question 7 medium
What is the primary complex carbohydrate polymer that provides structural rigidity to plant cell walls?
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Correct answer: C — cellulose
Cellulose is an organic polysaccharide composed of a linear chain of glucose units, forming microfibrils that provide tensile strength and rigidity to plant cell walls.
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Question 8 hard
Which major visceral organ is primarily responsible for xenobiotic metabolism, blood detoxification, and glycogen storage?
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Correct answer: D — liver
The liver is the body's primary metabolic and detoxification center, utilizing specialized enzymes (like cytochrome P450) to break down toxins, drugs, and metabolic byproducts.
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Question 9 hard
Which specific class of blood vessels features thick, elastic walls designed to withstand high pressure as they transport blood away from the heart?
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Correct answer: C — arteries
Arteries are high-pressure blood vessels featuring thick muscular and elastic walls that carry oxygenated blood (except for the pulmonary artery) away from the heart to tissues.
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Question 10 hard
What ecological term encompasses the total variability and variety of life forms across genetic, species, and ecosystem levels within a given region?
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Correct answer: B — biodiversity
Biodiversity refers to the full spectrum of life on Earth, encompassing genetic diversity within species, the variety of different species, and the complexity of ecosystems.