Nokea
The yolk sac __________.
- A. forms during the third trimester of pregnancy
- B. is the outer ring of cells that surrounds the blastocyst Copyright ƒâ€š‚© 2018 Laura E. Berk. All Rights Reserved. 3 Test Bank for Berk, Development Through the Lifespan, 7e
- C. produces blood cells until the organs are mature enough to take over this function
- D. contains one large vein that delivers blood loaded with nutrients and two arteries that remove waste
Correct Answer: C
Rationale: The yolk sac is an extraembryonic membrane that plays a significant role in the early development of the embryo. One of its functions is to produce blood cells until the organs are mature enough to take over this function. This process occurs during the early stages of prenatal development to support the growing embryo before it can sustain itself independently.
You may also like to solve these questions
As a generation, the baby boomers are __________ than any previous mid- or late-life cohort.
- A. healthier, but less educated
- B. more educated, but less wealthy
- C. more self-focused, but less healthy
- D. healthier, better educated, and financially better off
Correct Answer: D
Rationale: The baby boomers are healthier, better educated, and financially better off than any previous mid- or late-life cohort. This generation has generally enjoyed higher levels of education, advancements in healthcare, and increased economic opportunities, leading to improved overall well-being compared to earlier generations.
An inadequate diet during pregnancy can __________.
- A. lead to higher birth weight and greater brain weight
- B. reduce the risk of pregnancy-induced maternal diabetes
- C. distort the structure of the liver, kidney, and pancreas
- D. lead to fewer physical discomforts in the final weeks
Correct Answer: C
Rationale: An inadequate diet during pregnancy can lead to the distortion of the structure of the liver, kidney, and pancreas in the developing fetus. Proper nutrition during pregnancy is crucial for the healthy development of these organs and essential for the overall well-being of the baby. A balanced diet supports optimal growth and development, while inadequate nutrition can have detrimental effects on the baby's organs and long-term health.
In an experimental study examining whether children who are read to more often score higher on vocabulary tests in first grade, the independent variable would be the __________.
- A. frequency of read-alouds
- B. type of books parents read
- C. child's vocabulary score
- D. difficulty of vocabulary words
Correct Answer: A
Rationale: In an experimental study, the independent variable is the factor being manipulated or controlled by the researcher. In this case, the frequency of read-alouds is the variable that researchers would intentionally change or vary to see its effect on the dependent variable, which is the children's vocabulary scores. The other options (B. type of books parents read, C. child's vocabulary score, and D. difficulty of vocabulary words) are not the independent variable in this study as they are either irrelevant or are the outcome being measured.
To overcome some of the limitations of traditional developmental designs, investigators sometimes use __________ designs, in which they conduct several similar cross-sectional or longitudinal studies.
- A. sequential
- B. experimental
- C. correlational
- D. quasi-experimental
Correct Answer: A
Rationale: Sequential designs involve conducting multiple similar cross-sectional or longitudinal studies to overcome limitations of traditional developmental designs. By combining different types of study designs, researchers can gain a more comprehensive understanding of development over time. This approach allows for more robust conclusions and can help address potential confounding variables that may impact the results.
Which statement about interventions that support parents and preterm infants is true?
- A. Preterm infants whose parents receive coaching show no gains in mental test performance.
- B. Babies who are both preterm and economically disadvantaged require long-term, intensive intervention.
- C. For economically disadvantaged parents of preterm infants, just a few sessions of coaching are required.
- D. Even for parents with adequate economic and personal resources, long-term, intensive intervention is necessary.
Correct Answer: B
Rationale: Babies who are both preterm and economically disadvantaged typically require long-term, intensive intervention. This is because the combination of being born preterm and being economically disadvantaged can pose significant challenges for the infant's development. Providing ongoing support and interventions can help address these challenges and promote healthy development in these infants.