ATI TEAS Science Test

ATI TEAS Science Test Related

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An investigator wishes to test the effect of temperature on the durability of a certain material. He places five blocks of this material in a sunny area in a meadow and five more in a cold area high in the mountains. He then monitors them over time. What is the main problem with this experiment?

  • A. Ten subjects are far too small a number to obtain effective results.
  • B. It is impossible to control for the fact that the blocks in the mountains were placed later.
  • C. There are too many variables that are not being controlled for.
  • D. Nothing is wrong with this experiment; this demonstrates good experimental procedure.
Correct Answer: C

Rationale: The main problem with this experiment is that there are too many variables that are not being controlled for. The investigator is only changing one variable (temperature) while there are other variables at play such as humidity, exposure to light, and potential differences in the material itself. Without controlling or accounting for these additional variables, it would be difficult to determine if any observed differences in durability are solely due to temperature. Choice A is incorrect because the issue is not solely about the number of subjects but about the lack of control over variables. Choice B is not the main problem as the order of placement may not significantly impact the results. Choice D is incorrect as the experiment lacks proper control over variables, which is a crucial aspect of good experimental procedure.

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Which of the following items is NOT a primary function of a healthy immune system?

  • A. The immune system helps the body avoid infections.
  • B. The immune system detects infections.
  • C. The immune system eliminates infections.
  • D. The immune system creates infections.
Correct Answer: D

Rationale: The correct answer is D. The primary functions of a healthy immune system do not involve creating infections. A healthy immune system helps the body avoid infections by providing defense mechanisms, detects infections by recognizing harmful pathogens, and eliminates infections by attacking and clearing out pathogens. Creating infections goes against the protective role of the immune system and is not a function it performs. Therefore, choices A, B, and C are correct functions of a healthy immune system, while choice D is incorrect.

Which nervous system controls voluntary motor movement?

  • A. Parasympathetic
  • B. Sympathetic
  • C. Autonomic
  • D. Somatic
Correct Answer: D

Rationale: The correct answer is D: Somatic. The somatic nervous system is responsible for controlling voluntary motor movements. It includes the motor neurons that innervate skeletal muscles and allows us to consciously control our movements. The parasympathetic and sympathetic nervous systems are part of the autonomic nervous system, which controls involuntary functions such as heart rate and digestion. Therefore, choices A, B, and C are incorrect as they are components of the autonomic nervous system and are not primarily responsible for voluntary motor movements.

If every child in a certain family suffers from autism, what possible conclusion can be drawn about autism?

  • A. Autism may be lethal.
  • B. Autism may be genetic.
  • C. Autism is related to traditional nuclear family structures.
  • D. No conclusion can be drawn based on this evidence.
Correct Answer: B

Rationale: The possible conclusion that can be drawn from every child in a certain family suffering from autism is that autism may be genetic. The fact that every child in the family has autism suggests a strong genetic influence on the condition within this particular family. This does not necessarily mean that autism is solely genetic in all cases, but in this specific family, the pattern of all children being affected points towards a genetic connection. Choice A is incorrect as the information provided does not suggest that autism is lethal. Choice C is incorrect as there is no evidence to support a relationship between autism and traditional nuclear family structures. Choice D is incorrect because a conclusion can be drawn from the given evidence, indicating a potential genetic link within this specific family.

Which organ system is most responsible for maintaining control of body temperature?

  • A. The skeletal system.
  • B. The circulatory system.
  • C. The immune system.
  • D. The muscular system.
Correct Answer: B

Rationale: The circulatory system is the correct answer as it plays a crucial role in maintaining control of body temperature through a process called thermoregulation. Blood vessels near the skin surface dilate to dissipate heat when the body is too warm and constrict to reduce heat loss when it's too cold. Additionally, the circulatory system helps distribute heat produced from metabolic processes throughout the body to keep a stable internal temperature. The skeletal system provides structural support, the immune system defends against pathogens, and the muscular system is responsible for movement, but they are not primarily involved in regulating body temperature.

When a certain plant is introduced into an area, and the population of a certain insect species declines, what can be concluded from this?

  • A. The plant is toxic to the insect in question.
  • B. The plant competes with and drives out plants that the insect feeds on.
  • C. The insect population was declining anyway; the fact that it happened when the plant was introduced is a coincidence.
  • D. All of these explanations may be possible; further investigation is necessary to determine which is true.
Correct Answer: D

Rationale: The given scenario presents multiple possible explanations for the decline in the insect population with the introduction of a particular plant. It could be due to the plant being toxic to the insect (Option A), competing with and driving out plants that the insect feeds on (Option B), or the decline could be coincidental with the plant introduction as the insect population was already decreasing (Option C). Without further investigation and evidence, it is not possible to definitively determine which explanation is correct. Therefore, all of these possibilities may be true, and thorough investigation is necessary to reach a conclusive conclusion.

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