The list shows secondary sexual characteristics.
- Hair grows on the face.
- Hips become wider.
- Voice becomes deeper.
Which secondary sexual characteristics are caused by testosterone?
A) 1, 2 and 3
B) 1 and 2 only
C) 1 and 3 only
D) 2 and 3 only
▶️ Answer/Explanation
Ans: C
Testosterone causes male secondary sexual characteristics: facial hair growth (1) and voice deepening (3). Wider hips (2) are caused by estrogen in females.
Thus, only characteristics 1 and 3 are testosterone-dependent, making C the correct choice. Options A, B, and D incorrectly associate estrogen-linked traits with testosterone.
Which secondary sexual characteristic is caused by both testosterone and oestrogen?
A) breast development
B) changes in body shape
C) growth of facial hair
D) sudden deepening of voice
▶️ Answer/Explanation
Ans: B
Changes in body shape (B) occur in both sexes during puberty under the influence of both hormones: testosterone promotes broader shoulders in males, while oestrogen causes wider hips in females.
Breast development (A) is oestrogen-dependent, while facial hair (C) and voice deepening (D) are testosterone-specific. Only body shape changes are mediated by both hormones.