Question

1. which example best represents negative feedback?

a. a cut healing with scar tissue
b. sweating to lower body temperature
c. a population growing without limits
d. a mutation spreading instantly

Explanation:

Negative feedback in biology is a mechanism that counteracts a change to maintain homeostasis. Let's analyze each option:

• Option A: A cut healing with scar tissue is a repair process, not negative feedback (it's not countering a change to maintain a set point).
• Option B: When body temperature rises, sweating increases to cool the body down, bringing temperature back to normal. This is negative feedback as it opposes the temperature increase.
• Option C: Uncontrolled population growth is not negative feedback (no counteraction to maintain a balance).
• Option D: Instant mutation spread is not a negative feedback mechanism (no homeostatic balance maintenance).

Answer:

B. Sweating to lower body temperature