Question

Which hormone is responsible for secondary sexual character in females?
A. Testosterone
B. Oestrogen
C. Thyroxine
D. Pituitary

Answer 1

Hint: Features that appear during puberty in humans, and at sexual maturity in other animals are known as secondary sex character or features. Secondary sex characteristics in females include: breasts enlargement and nipple erection; body hair growth; hip widening and lower waist to hip ratio; hyperextended elbows and Labia minora which is the vulva's inner lips may become more prominent.

Complete answer:
Option A Testosterone: Testosterone is the male sex hormone which is an androgen. It plays an important role in reproduction, growth, and maintenance of body health. But women also produce testosterone in relatively lower quantities. The ovaries produce both testosterone and estrogen. Testosterone in females is not responsible for secondary sexual characters.
Hence option A is not correct.
Option B Oestrogen: Oestrogen or so-called Estrogen is a category of sex hormone which is responsible for development and regulation of the reproductive system and secondary sex characteristics in females. The three major endogenous estrogens that have estrogenic hormonal activity are: estrone, estradiol, and estriol. Estrogen in females assists in endometrial regrowth, ovulation, and calcium absorption. It is also responsible for the secondary sexual characteristics of females.
Hence option B is the correct answer.
Option C Thyroxine: It is the hormone produced by thyroid gland which acts to increase the metabolic rate and thereby regulating growth and development. It is not responsible for secondary sexual characters in females.
Therefore, option C is not correct.
Option D Pituitary: The pituitary gland is a small pea-sized gland which plays an important role in the regulation of vital body functions and general wellbeing. It is not responsible for secondary sexual characters in females.
Hence option D is not correct.

Hence, Option B. Oestrogen or Estrogen is the correct answer.

Note:
In all vertebrates and some insects, estrogen hormones are synthesized. The presence of estrogen in both vertebrates and insects suggests that these sex hormones have an ancient evolutionary history. Other than natural hormones, estrogens are used for medications, for instance in menopausal hormone therapy, hormonal birth control and feminizing hormone therapy for transgender women and non-binary people.