the ectoderm becomes the
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Human Growth and Development Final Exam Answers

1. During prenatal development, the ectoderm becomes the __________.

Correct answer: B

Rationale: The correct answer is B: nervous system and skin. The nervous system, which includes the brain, spinal cord, and nerves, as well as the skin, develop from the ectoderm layer of cells during prenatal development. Choice A is incorrect because muscles and skeleton develop from mesoderm. Choice C is incorrect because the circulatory system and other internal organs develop from mesoderm and endoderm. Choice D is incorrect because the digestive system, lungs, urinary tract, and glands develop from endoderm.

2. According to the continuous view of development, the difference between the immature and the mature is simply one of amount or complexity.

Correct answer: D

Rationale: The correct answer is D. According to the continuous view of development, the difference between the immature and the mature is seen as simply one of amount or complexity. This view suggests that development is a gradual and continuous process where individuals steadily acquire new abilities without abrupt changes or stages. Choices A, B, and C are incorrect because nature, discontinuous, and nurture do not align with the description provided in the question. Nature typically refers to genetic or biological factors, discontinuous implies stages or abrupt changes, and nurture relates to environmental influences, none of which are synonymous with the continuous view of development.

3. When Baby Ian is held horizontally on his back, he sometimes makes an “embracing” motion by arching his back, extending his legs, throwing his arms outward, and then bringing his arms in toward his body. Ian is demonstrating the __________.

Correct answer: B

Rationale: Baby Ian is demonstrating the Moro reflex. The Moro reflex is a normal newborn reflex that occurs when a baby feels like they are falling or losing support. It is characterized by arching the back, extending the legs, throwing the arms outward, and then bringing the arms in toward the body. This reflex is a primitive survival instinct that typically disappears around 6 months of age. Choice A, palmar grasp, involves the baby's fingers closing around an object when it touches their palm. Choice C, tonic neck reflex, involves the baby assuming a fencing position when their head is turned to one side. Choice D, Babinski reflex, is characterized by the fanning out and curling of the baby's toes when the sole of the foot is stroked.

4. Who is generally regarded as the founder of the child study movement?

Correct answer: B

Rationale: Arnold Gesell is generally regarded as the founder of the child study movement, emphasizing the importance of observing and documenting children's behaviors to understand their development. While he was a significant figure in child development research, he did not specifically write child-rearing books for parents, foreshadow lifespan research, or construct the first successful intelligence test. Choice A is incorrect as Gesell's focus was more on research rather than writing child-rearing books. Choice C is incorrect as Gesell's main contributions were in child development, not specifically in aging research. Choice D is incorrect as Gesell is not credited with constructing the first successful intelligence test.

5. Why do young infants usually cry?

Correct answer: C

Rationale: Young infants usually cry because of physical needs such as hunger, discomfort, or needing to be changed. It is their way of communicating these needs to their caregivers as they are unable to do so in any other way. Choice A is incorrect because infants cry primarily to communicate physical needs, not because they are bored. Choice B is incorrect because the tone of the cry is not the reason why infants cry. Choice D is incorrect because infants cry for various physical needs, not necessarily all night long.

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