Question

External or accessory or secondary sexual characters first appear in
A. Childhood
B. Puberty
C. Foetus
D. Adulthood

Answer 1

Male is unisexual and reveals distinct sexual dimorphism. Male visibility differs from the female in physical standards, external genital organs, and accessory sex characters. The reproductive system of each sex consists of many organs. The latter is distinguishable into primary and secondary sex organs. Besides these, there are some accessory sex characters.

Complete answer:
Accessory or external sex characters. There are in each sex certain accessory or external sex characters that distinguish the two sexes of a species externally. They play an indirect role in reproduction such as attraction for the mate, protection against intruders into the breeding territory, etc. It starts at puberty.

Character	Male	Female
Body build	The body is larger, more muscular, and stronger	The body is smaller, less muscular, and weaker
Hair	Beard, mustache, and chest hair present	Beard, mustache, and chest hair lacking
Breasts	Poorly developed	Vert well developed
Skin	More hairy and coarse	Less hairy and soft
Shoulders	Broad	Narrow
Pelvis	Narrow	Broad
Larynx	Prominent forward projection in the neck	Little prominent
Voice	Low pitched	High pitched
Subcutaneous fat	Very little	Considerable
Basal metabolic rate	1600Kcal/day	1520Kcal/day
Behavior	Often aggressive	Often mild

So, the correct answer is option B-Puberty

Note: Primary sex organs are called gonads. These give rise to sex cells or gametes and secrete sex hormones. These give rise to sex cells or gametes and sex hormones. Secondary sex organs. Include the reproductive (genital ) ducts that transport gametes and reproductive (genital) glands that help in the reproductive process. They do not produce gametes or secrete hormones.