ASVAB Study GuideGeneral Science Practice Test 1
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 human body system is responsible for moving oxygenated blood, nutrients, and hormones throughout the body?
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Correct answer: C — Circulatory system
The circulatory system (consisting of the heart, blood vessels, and blood) is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the human body.
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Question 2 easy
What is the primary biological process that plants use to convert sunlight, water, and carbon dioxide into food (glucose)?
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Correct answer: A — Photosynthesis
Photosynthesis is the process used by plants, algae, and some bacteria to harness light energy from the sun to convert carbon dioxide and water into chemical energy in the form of glucose.
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Question 3 easy
Which of the following animal classifications describes creatures that consume exclusively plant matter?
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Correct answer: C — Herbivores
Herbivores are animals whose primary food source is plant-based (e.g., cows, rabbits, and deer). Carnivores eat meat, and omnivores eat both plants and animals.
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Question 4 medium
Which vital human organ is primarily responsible for pumping blood through the circulatory network?
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Correct answer: C — Heart
The heart is a muscular organ that acts as a dual pump, continuously circulating deoxygenated blood to the lungs and oxygenated blood to the rest of the body.
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Question 5 medium
What is the primary hereditary molecule found in the cell nucleus that carries genetic instructions from parents to offspring?
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Correct answer: B — DNA
DNA (Deoxyribonucleic acid) is the hereditary material in humans and almost all other organisms, storing the genetic code responsible for development, functioning, growth, and reproduction.
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Question 6 medium
Which type of ecological organism is primarily responsible for breaking down dead organic matter and returning nutrients to the soil?
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Correct answer: C — Decomposer
Decomposers (such as fungi and bacteria) break down dead plants and animals, recycling essential nutrients back into the ecosystem and soil.
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Question 7 medium
Which primary plant organ is mainly responsible for anchoring the plant and absorbing water and dissolved mineral nutrients from the soil?
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Correct answer: C — Roots
Roots anchor vascular plants into the ground while absorbing water and mineral nutrients from the soil to transport upward.
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Question 8 hard
What is the primary gaseous waste product expelled from the body during cellular and animal respiration?
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Correct answer: C — Carbon dioxide
During cellular respiration, animals take in oxygen to break down glucose for energy, producing carbon dioxide and water as metabolic waste products.
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Question 9 hard
What is the largest internal or external organ in the human body by surface area and weight?
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Correct answer: B — Skin
The skin (integumentary system) is the largest organ of the human body, acting as a protective barrier against pathogens, regulating temperature, and sensing stimuli.
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Question 10 hard
An animal species that consumes both plant matter and other animals for survival is classified as a(n)
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Correct answer: C — omnivore.
Omnivores are organisms that have the ability to eat and survive on both plant and animal matter (e.g., humans, bears, and pigs).