which statement about a blastocyst is true
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Human Growth and Development Exam Questions

1. Which statement about a blastocyst is true?

Correct answer: C

Rationale: The statement that is true about a blastocyst is that between the seventh and ninth days, it burrows deep into the uterine lining. This process, known as implantation, is essential for the blastocyst to establish a connection with the mother's body and receive nutrients for further development. It is a critical stage in prenatal development and sets the foundation for pregnancy. Choices A, B, and D are incorrect. A blastocyst is not a single cell but rather a structure composed of many cells. It is not a structure that feeds the developing organism; instead, it implants in the uterine lining to receive nutrients. It is not a membrane that regulates temperature but plays a crucial role in the initial stages of pregnancy by implanting in the uterus.

2. A major strength of the information-processing approach to development is its commitment to __________.

Correct answer: C

Rationale: The major strength of the information-processing approach to development is its commitment to rigorous research methods. This approach emphasizes systematic observation, measurement, and experimentation to study cognitive development in individuals. By using rigorous research methods, researchers can gather reliable and valid data to better understand how information is processed in the human mind. This commitment to methodological rigor enhances the credibility and validity of the conclusions drawn within the information-processing approach to development. Choices A, B, and D are incorrect because the information-processing approach focuses on empirical research methods rather than the study of imagination, case study interviews, or disproving other developmental theories.

3. Men with even tiny amounts of dioxin in their bloodstream father __________.

Correct answer: A

Rationale: Men with even tiny amounts of dioxin in their bloodstream father nearly twice as many girls as boys. This is due to the impact of dioxin exposure on sperm cells, leading to a skewed ratio of female to male offspring. Choice B is incorrect as the question specifically mentions that men father more girls than boys. Choice C is incorrect as dioxin exposure does not necessarily lead to more twins and triplets. Choice D is incorrect as men with dioxin in their bloodstream father more girls, not fewer children overall.

4. Under ethical standards, when is deception permitted in research studies?

Correct answer: B

Rationale: Ethical standards permit deception in research studies if investigators satisfy institutional review boards that such practices are necessary. Institutional review boards are responsible for ensuring that research studies comply with ethical guidelines and protect the welfare of study participants. Deception should only be used when necessary, and the board's approval indicates that safeguards are in place to minimize harm to participants. Choices A, C, and D are incorrect because ethical deception in research studies is not based on the age of participants, observing from behind mirrors, or obtaining informed consent without revealing the study's real purpose.

5. If pregnancy does not occur, the corpus luteum shrinks, and the __________.

Correct answer: D

Rationale: If pregnancy does not occur, the corpus luteum will shrink. As a result, the lining of the uterus is discarded through the process of menstruation. This shedding of the uterine lining is what causes menstrual bleeding. Choices A, B, and C are incorrect because they do not describe the physiological response of the body when pregnancy does not occur. The corpus luteum shrinking and the subsequent shedding of the uterine lining are part of the menstrual cycle, not processes related to cell duplication, zygote multiplication, or the duration of the germinal period.

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