IB DP Biology- D3.3 Homeostasis - IB Style Questions For SL Paper 1A -FA 2025
▶️ Answer/Explanation
Detailed solution
The pineal gland produces melatonin, a hormone that helps regulate the body’s circadian rhythm. This makes row A the only correct match. ✅ Answer: (A)
▶️ Answer/Explanation
Answer: C
Identifying structures:
X:
• X points to a coiled tube deep in the dermis.
• This is the characteristic shape and location of a sweat gland.
Y:
• Y attaches to the side of the hair follicle at an angle.
• This is the hair erector muscle (arrector pili), responsible for goosebumps.
Z:
• Z is a long, thin structure connected to a receptor ending.
• This represents a sensory neurone carrying impulses from skin receptors.
Correct Matching:
| Label | Structure |
|---|---|
| X | Sweat gland |
| Y | Hair erector muscle |
| Z | Sensory neurone |
✅ Answer: C