The question asks for the specific term that describes the period of life when the body undergoes changes leading to reproductive maturity. We need to evaluate each option based on its scientific definition in human development.
Correct Option: B) Adolescence is the period of life when the body undergoes changes leading to reproductive maturity. It is a broader developmental stage that includes puberty.
The question asks to identify the hormone responsible for the development of secondary sexual characteristics in males. This is a direct knowledge-based question related to human endocrinology.
Testosterone is the principal male sex hormone, primarily produced in the testes. It plays a crucial role in the development of male reproductive tissues and secondary sexual characteristics such as increased muscle and bone mass, growth of body hair, and deepening of the voice. These changes typically occur during puberty.
Correct Option: B) Testosterone is the primary androgen (male sex hormone) responsible for the development and maintenance of male secondary sexual characteristics, including facial and body hair growth, muscle development, deepening of the voice, and sperm production.
UPSC - 2021
The question asks which of the given microorganisms (bacteria, fungi, virus) can be cultured in an artificial or synthetic medium. This requires understanding the basic biological requirements and cultivation methods for each type of microorganism.
Based on this, only bacteria and fungi can be cultured in artificial/synthetic media.
A) 1 and 2 only. Bacteria and fungi can be grown in artificial/synthetic media because they possess the necessary metabolic machinery to utilize the nutrients provided in such media. Viruses, being obligate intracellular parasites, cannot.
The question asks about the typical age at which adolescence begins. Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood. Understanding the generally accepted age range for the onset of adolescence is key to answering this question.
C) 11 years — This age is widely accepted as a typical starting point for the onset of puberty and the beginning of adolescence, particularly for girls, with boys often following a year or two later. It represents the average age when significant hormonal and physical changes begin.
The question asks to identify the gland responsible for controlling the activities of other endocrine glands. This points to the master gland of the endocrine system.
Correct Option: C) The Pituitary gland is known as the "master gland" because it secretes hormones that regulate the functions of other endocrine glands.
This question asks to identify a secondary sexual characteristic in boys. Secondary sexual characteristics are physical traits that distinguish males from females but are not directly involved in reproduction. They develop during puberty due to hormonal changes.
Correct Option: C) Growth of facial hair. This is a classic example of a secondary sexual characteristic in boys, driven by male hormones like testosterone, which develops during puberty.