TEAS Practice Test Science

Correct Answer: C

Rationale: The independent variable is the one that is intentionally manipulated by the researcher. In this case, the botanist is studying root growth, so the variable that the botanist can control and manipulate is the light exposure. By changing the amount of light the roots receive, the botanist can observe how it affects root growth. Temperature (choice A) and root tissue (choice B) are not variables being manipulated in this experiment, so they are not the independent variable. Root length (choice D) is the dependent variable, as it is the outcome being measured based on the changes in the independent variable, light exposure.

Correct Answer: B

Rationale: The correct answer is B: To exchange gases. The main function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide between the body and the external environment. This process occurs in the lungs through breathing, where oxygen is taken in and carbon dioxide is expelled. Absorbing nutrients (A) is the function of the digestive system, transporting oxygen (C) is part of the circulatory system's role, and regulating blood pressure (D) is primarily controlled by the cardiovascular system.

Correct Answer: B

Rationale: Sure, here's the step-by-step rationale for why choice B is the correct answer: 1. Qualitative research is subjective. 2. Scientific arguments should rely on objective, quantitative data. 3. Extensive use of qualitative research weakens objectivity. 4. Objective data strengthens scientific arguments. Summary of other choices: A: Lack of bias strengthens a scientific argument by ensuring objectivity. C: Reproducibility strengthens a scientific argument by validating results. D: Standing the test of time strengthens a scientific argument by showing consistency.

Correct Answer: B

Rationale: The correct answer is B: Nephron. The nephron is the basic structural and functional unit of the kidney because it is responsible for filtering blood, regulating fluid balance, and producing urine. It consists of the glomerulus, tubules, and collecting ducts. The other choices, A: Neuron, C: Glomerulus, and D: Axon, are not correct as they do not perform the specific functions related to kidney physiology. Neurons are nerve cells, glomerulus is a part of the nephron, and axon is a part of a neuron.

Correct Answer: A

Rationale: The correct answer is A: Femur. Long bones are characterized by their elongated shape, with the length exceeding the width. The femur, as the thigh bone, perfectly fits this description. It serves as a major weight-bearing bone and plays a crucial role in movement and support. Ribs and cranial bones (Choice B) belong to the category of flat bones. Sesamoid bones (Choice C) are small bones embedded within tendons. Vertebrae and hip bones (Choice D) are classified as irregular bones due to their complex shapes and structures.