TEAS science practice questions
- questions on the exam
- 50 questions on the exam
- minutes
- 60 minutes
- free here
- 10 free here
- last updated
- October 2026 last updated
Ten free TEAS science practice questions are below, answerable on this page. They cover the four areas ATI tests in science: human anatomy and physiology, biology, chemistry and scientific reasoning. Each one comes with an explanation.
TEAS Science
10 free TEAS science questions
Answer, check, and read the explanation.
TEAS Science
Question 1 of 10
Which sequence correctly traces blood from the body back to the body?
Not quite. The answer is B
Key takeaway
Blood returns from the body through veins into the right atrium, passes to the right ventricle, goes to the lungs, returns to the left atrium, then the left ventricle, and leaves through systemic arteries.
During inhalation, what happens to the diaphragm and to the air pressure inside the lungs?
Not quite. The answer is A
Key takeaway
The diaphragm contracts and moves down, chest volume increases, and lung pressure falls below outside pressure, so air flows in.
Which hormone released by the anterior pituitary stimulates the adrenal cortex to release cortisol?
Not quite. The answer is D
Key takeaway
ACTH from the anterior pituitary stimulates cortisol release. TSH acts on the thyroid and FSH acts on reproductive function.
What is the main function of bile in digestion?
Not quite. The answer is B
Key takeaway
Bile emulsifies fat into droplets, giving lipase more surface to work on. Bile is not an enzyme, so it does not chemically split starch, protein or nucleotides.
Two unaffected parents have a child with a rare recessive trait. What is the most likely genotype of both parents?
Not quite. The answer is A
Key takeaway
The child must have received a recessive allele from each parent. Because the parents are unaffected, each must be a heterozygous carrier.
A membrane lets water pass but not sugar, with 5% sugar on the left and 10% on the right. Net water movement is:
Not quite. The answer is C
Key takeaway
In osmosis, net water movement goes from the side with lower solute concentration to the side with higher solute concentration. Here the 5% side is lower, so water moves left to right.
In DNA, which base pairs are correctly matched?
Not quite. The answer is A
Key takeaway
DNA pairs adenine with thymine and cytosine with guanine. Each pair has one purine and one pyrimidine. U replaces T only in RNA.
Which statement correctly describes isotopes of the same element?
Not quite. The answer is C
Key takeaway
Isotopes share an atomic number (proton count) but differ in neutrons, so their masses differ. Changing the proton count would make a different element.
What is the correctly balanced equation for the synthesis of ammonia?
Not quite. The answer is B
Key takeaway
Placing 2 before NH3 gives two N atoms, matching N2. Then 3 before H2 gives six H atoms on each side.
Which of the following is the best testable hypothesis about plant growth?
Not quite. The answer is D
Key takeaway
A testable hypothesis names a change and a measurable result. The bean plant statement gives both light time and height over two weeks, while 'Plants like light' is too vague.
Breakdown
What the TEAS science section covers
50 questions in 60 minutes, across 4 content areas.
- Human anatomy and physiology
- The body systems: cardiovascular, respiratory, digestive, nervous, endocrine, immune, reproductive, urinary, skeletal and skin, plus anatomical terms and planes.
- Biology
- Cell structure and organelles, macromolecules, DNA and RNA, genetics and inheritance, mitosis and meiosis, and microorganisms.
- Chemistry
- Atomic structure and isotopes, states of matter, balancing equations, reaction rates, solutions and acids and bases.
- Scientific reasoning
- Measurement tools and units, hypotheses and variables, and what a result does and does not let you conclude.
Tips
How to score better on TEAS science
- Learn the body systems one at a time. Anatomy and physiology is the first and broadest of the four science areas.
- Trace processes in order out loud: blood through the heart, air through the airway, food through the gut.
- For experiment questions, name the independent and dependent variable before reading the options.
FAQ
TEAS science FAQ
How many questions are in the TEAS science section?
50 questions in 60 minutes on TEAS 7, the longest section by question count. Some are unscored pretest items.
What science is on the TEAS?
Human anatomy and physiology, biology, chemistry and scientific reasoning. Anatomy and physiology covers every major body system, so plan for it to take the most study time.
Is the TEAS science section hard?
It covers the most ground of the four sections: body systems, biology, chemistry and experiment design. Practising by area and reading every explanation is the most direct way to close gaps.
Other TEAS sections
Sources
Exam format as published for TEAS 7. Nursia is not affiliated with ATI Testing. Updated October 2026.
Keep practising TEAS science.
The Nursia app has more TEAS questions across all four sections, each with an explanation, plus full mock tests. Pick ATI TEAS when you sign up.
Free TEAS practice questions and a free mock test