Which of the following are characteristics of conservation in school-aged children? (Select All that Apply.)
Thinking that cutting a sandwich into more pieces means there is more food
Believing that pouring water from a short, wide cup into a tall, narrow cup increases the amount of water
Understanding that the amount of a substance remains the same even if its appearance changes
Recognizing that a ball of clay can be flattened and rolled back into a ball without changing its amount
Believing that a taller, narrower glass contains more liquid than a shorter, wider glass
Correct Answer : C,D
A. This reflects a lack of understanding of conservation, as cutting a sandwich does not increase the quantity of food.
B. This belief shows a misunderstanding of conservation, where children may not recognize that the volume remains constant regardless of the container's shape.
C. Understanding that the amount of a substance remains the same even if its appearance changes is a key characteristic of conservation.
D. Recognizing that a ball of clay can be flattened and rolled back into a ball without changing its amount also demonstrates an understanding of conservation.
E. This belief indicates a misunderstanding of conservation, as the amount of liquid does not change based on the height or width of the container.
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Correct Answer is ["C","D","E"]
Explanation
A. Vocal changes are more pronounced in boys during puberty; girls typically do not experience significant vocal changes.
B. Height does not decrease; instead, girls experience a growth spurt during puberty before reaching their adult height.
C. Breast development is one of the first signs of puberty in girls, typically occurring between ages 8 and 13.
D. Menarche, the first menstrual period, usually occurs later in puberty and is an important milestone indicating the onset of reproductive capability.
E. Increased axillary hair growth is also a common change that occurs during puberty as hormone levels rise.
Correct Answer is ["C","D","E"]
Explanation
A. Pertussis primarily affects the respiratory tract rather than just the nostrils.
B. Pertussis is caused by the bacterium Bordetella pertussis, making it a bacterial infection, not viral.
C. The bacteria release toxins that damage the cilia of the epithelial cells in the respiratory tract, disrupting their function.
D. Inflammation occurs in the lungs and airway due to the infection, contributing to symptoms such as cough.
E. The infection leads to excessive secretions that are difficult to expel, resulting in the characteristic whooping cough associated with pertussis.