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Q1. The male sex hormone responsible for the development of masculine characteristics is called:
Testosterone is the male sex hormone produced by the testes. It is responsible for the development of masculine characteristics such as deepening of voice, growth of facial and body hair, broadening of shoulders, and muscle development. Estrogen and progesterone are female hormones, and insulin regulates blood sugar.
Q2. The female sex hormone responsible for the development of feminine characteristics is called:
Estrogen is the female sex hormone produced by the ovaries. It is responsible for the development of feminine characteristics such as breast development, widening of hips, and regulation of the menstrual cycle. Testosterone is the male hormone, adrenaline is the fight-or-flight hormone, and thyroxine regulates metabolism.
Q3. The glands that secrete hormones directly into the bloodstream are called:
Endocrine glands are ductless glands that release their secretions (hormones) directly into the bloodstream. These hormones travel through the blood to target organs. Exocrine glands (like sweat and salivary glands) release their secretions through ducts to the outside of the body or into body cavities.
Q4. The period of life when the human body undergoes changes to become capable of reproduction is called:
Puberty is the period during which the human body undergoes physical and hormonal changes to become capable of reproduction. It is the stage when secondary sexual characteristics develop and the reproductive organs become functional. Infancy is early childhood, adulthood is the mature stage, and menopause is the end of the reproductive phase.
Q5. The gland often called the “master gland” because it controls other endocrine glands is the:
The pituitary gland is often called the “master gland” because it controls the function of other endocrine glands. It secretes hormones that stimulate the thyroid, adrenal glands, ovaries, and testes to produce their respective hormones. The thyroid regulates metabolism, the adrenal produces adrenaline, and the pancreas produces insulin.
Q6. The hormone responsible for the growth of the body is secreted by the:
The pituitary gland secretes growth hormone (GH), which is responsible for the growth of the body, especially during childhood and adolescence. It stimulates the growth of bones and tissues. The thyroid secretes thyroxine, the adrenal secretes adrenaline, and the pancreas secretes insulin.
Q7. The onset of puberty is triggered by the release of hormones from which gland?
The onset of puberty is triggered by the release of hormones from the pituitary gland. The pituitary releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which stimulate the testes and ovaries to produce sex hormones (testosterone and estrogen). This starts the process of puberty.
Q8. Which hormone is responsible for initiating the production of sperm in males?
Testosterone is the hormone responsible for initiating sperm production in males. It is produced by the testes under the stimulation of hormones from the pituitary gland. Estrogen and progesterone are female hormones, and insulin regulates blood sugar.
Q9. Which hormone is responsible for regulating the menstrual cycle in females?
Estrogen is the hormone responsible for regulating the menstrual cycle in females, along with progesterone. It is produced by the ovaries and controls the development and release of eggs and the preparation of the uterine lining. Testosterone is the male hormone, adrenaline is the fight-or-flight hormone, and thyroxine regulates metabolism.
Q10. The reproductive phase of life in human females begins at:
The reproductive phase of life in human females begins at menarche, which is the first menstrual flow. Menarche marks the onset of reproductive capability. Puberty is the broader period of physical changes, menopause is the end of the reproductive phase, and birth is the beginning of life.
Q11. The reproductive phase of life in human females ends at:
The reproductive phase of life in human females ends at menopause, which is the permanent stoppage of menstruation. Menarche is the beginning of menstruation, puberty is the period of sexual maturation, and adolescence is the transitional period. Menopause typically occurs around the age of 45-50.
Q12. The monthly shedding of the uterine lining along with blood and tissue is called:
Menstruation is the monthly shedding of the uterine lining along with blood and tissue when fertilization does not occur. It is part of the menstrual cycle. Ovulation is the release of an egg, fertilization is the fusion of gametes, and implantation is the attachment of the embryo to the uterus.
Q13. The first menstrual flow in a girl is called:
Menarche is the first menstrual flow in a girl, marking the beginning of her reproductive life. Menopause is the stoppage of menstruation, ovulation is the release of an egg, and puberty is the period of sexual maturation. Menarche usually occurs between the ages of 10 and 16.
Q14. The permanent stoppage of menstruation in females is called:
Menopause is the permanent stoppage of menstruation in females, typically occurring around the age of 45-50. It marks the end of the reproductive phase. Menarche is the first menstruation, puberty is the period of sexual maturation, and ovulation is the release of an egg.
Q15. The sex chromosomes in a human male are represented as:
Human males have one X chromosome and one Y chromosome, represented as XY. The X chromosome comes from the mother, and the Y chromosome comes from the father. The presence of the Y chromosome determines maleness. Females have XX chromosomes.
Q16. The sex chromosomes in a human female are represented as:
Human females have two X chromosomes, represented as XX. Both X chromosomes are contributed by the parents (one from the mother and one from the father). Males have XY chromosomes. The presence of XX chromosomes determines femaleness.
Q17. The sex of a baby is determined by the chromosome contributed by:
The sex of a baby is determined by the chromosome contributed by the father. The father can contribute either an X chromosome (resulting in a female baby, XX) or a Y chromosome (resulting in a male baby, XY). The mother always contributes an X chromosome. The environment does not determine sex.
Q18. If a child receives an X chromosome from the father and an X chromosome from the mother, the child will be:
If a child receives an X chromosome from the father and an X chromosome from the mother, the child will have XX sex chromosomes and will be female. The father’s X chromosome combines with the mother’s X chromosome to produce a female offspring. The presence of Y chromosome is required for maleness.
Q19. If a child receives a Y chromosome from the father and an X chromosome from the mother, the child will be:
If a child receives a Y chromosome from the father and an X chromosome from the mother, the child will have XY sex chromosomes and will be male. The Y chromosome carries the SRY gene that triggers male development. Nutrition does not determine sex.
Q20. The Y chromosome is found in:
The Y chromosome is found only in males. It is one of the sex chromosomes; males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). The Y chromosome carries genes that determine maleness and is not found in females.
Q21. Which gland produces the hormone testosterone?
The testes (singular: testis) are the male reproductive organs that produce testosterone. The ovaries produce estrogen and progesterone, the pituitary produces various hormones (including LH and FSH), and the adrenal produces adrenaline. Testosterone is the primary male sex hormone.
Q22. Which gland produces the hormone estrogen?
The ovaries are the female reproductive organs that produce estrogen and progesterone. The testes produce testosterone, the pituitary produces many hormones, and the thyroid produces thyroxine. Estrogen is the primary female sex hormone.
Q23. The role of hormones in initiating reproductive function is to:
Hormones play a key role in initiating reproductive function by triggering the development of reproductive organs and secondary sexual characteristics. They do not stop growth, decrease metabolic rate, or prevent puberty. Instead, they cause the physical changes associated with puberty and reproductive maturity.
Q24. The pituitary gland stimulates the testes to produce testosterone by releasing:
The pituitary gland releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which stimulate the testes to produce testosterone and sperm. Growth hormone controls growth, thyroid-stimulating hormone controls the thyroid, and insulin regulates blood sugar. LH and FSH are the gonadotropins.
Q25. The pituitary gland stimulates the ovaries to produce estrogen by releasing:
The pituitary gland releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which stimulate the ovaries to produce estrogen and regulate the menstrual cycle. Growth hormone controls growth, thyroid-stimulating hormone controls the thyroid, and adrenaline is released by the adrenal glands.
Q26. Reproductive health refers to:
Reproductive health encompasses physical, emotional, and social well-being related to the reproductive system. It is not limited to the absence of disease or only mental well-being. It includes all aspects of health related to reproduction.
Q27. Which of the following is essential for maintaining reproductive health during adolescence?
Maintaining personal hygiene and a balanced diet is essential for reproductive health during adolescence. Junk food, avoiding physical activity, and staying up late are harmful habits. Good hygiene prevents infections, and a balanced diet provides necessary nutrients for growth and development.
Q28. The process of release of a mature egg from the ovary is called:
Ovulation is the process of release of a mature egg from the ovary into the fallopian tube. Menstruation is the shedding of the uterine lining, fertilization is the fusion of gametes, and implantation is the attachment of the embryo to the uterus. Ovulation occurs approximately once a month.
Q29. During the menstrual cycle, if fertilization does not occur, the uterine lining:
If fertilization does not occur during the menstrual cycle, the uterine lining breaks down and is shed as menstruation. If fertilization occurs, the lining remains to support the developing embryo. The lining does not thicken further or remain unchanged; it is shed during menstruation.
Q30. The fusion of a male sperm with a female egg is called:
Fertilization is the fusion of a male sperm with a female egg to form a zygote. Menstruation is the shedding of the uterine lining, ovulation is the release of an egg, and menopause is the stoppage of menstruation. Fertilization is the first step in the development of a new individual.
Q31. Which of the following is a secondary sexual characteristic in males that is directly influenced by testosterone?
Growth of facial hair is a secondary sexual characteristic in males, directly influenced by testosterone. Widening of hips and development of breasts are female characteristics, and onset of menstruation is a female reproductive event. Testosterone is responsible for the development of masculine traits.
Q32. Which of the following is a secondary sexual characteristic in females that is directly influenced by estrogen?
Widening of hips is a secondary sexual characteristic in females, directly influenced by estrogen. Growth of facial hair, deepening of voice, and enlargement of the larynx are male characteristics influenced by testosterone. Estrogen promotes the development of feminine traits.
Q33. The endocrine gland that regulates the body’s metabolic rate is the:
The thyroid gland regulates the body’s metabolic rate by secreting thyroxine. It controls how quickly the body uses energy and produces heat. The pituitary controls other glands, the adrenal produces adrenaline, and the pancreas produces insulin. The thyroid is the correct answer.
Q34. The hormone insulin is secreted by which gland?
Insulin is secreted by the pancreas. It regulates blood sugar levels by helping cells absorb glucose. The thyroid secretes thyroxine, the pituitary secretes many hormones, and the adrenal secretes adrenaline. Insulin is essential for maintaining normal blood sugar levels.
Q35. The hormone responsible for the “fight or flight” response is:
Adrenaline, secreted by the adrenal glands, is responsible for the “fight or flight” response. It prepares the body for stressful situations by increasing heart rate, blood pressure, and energy supply. Estrogen and testosterone are sex hormones, and insulin regulates blood sugar.
Q36. During adolescence, the increased activity of sweat and oil glands can lead to:
During adolescence, increased activity of sweat and oil (sebaceous) glands can lead to acne. The oil produced can block pores and cause pimples. Height increase, voice change, and hair loss are not directly caused by increased gland activity. Acne is a common skin condition during puberty.
Q37. A balanced diet during adolescence is important because:
A balanced diet is important during adolescence because it provides necessary nutrients—proteins, carbohydrates, fats, vitamins, and minerals—for rapid growth and development. It does not prevent puberty, stop hormone production, or reduce the need for sleep. Proper nutrition supports healthy development.
Q38. Which of the following is a myth regarding reproductive health?
Eating oily food directly causing acne is a myth. Acne is caused by hormonal changes that increase oil production in the skin, not directly by diet. The other statements are scientifically correct. Maintaining hygiene during menstruation, sex determination by the father, and a balanced diet for growth are all true.
Q39. The approximate duration of the menstrual cycle in humans is:
The average duration of the menstrual cycle in humans is approximately 28 days. However, it can vary from person to person (typically 21 to 35 days). 7 days is the duration of menstruation, 14 days is when ovulation occurs, and 60 days is too long for a normal cycle.
Q40. Menstruation occurs when:
Menstruation occurs when the uterine lining is shed because fertilization has not occurred. If an egg is fertilized, the lining is maintained for pregnancy. Ovulation is the release of an egg, and menopause is the permanent stoppage of menstruation.
Q41. The reproductive phase in human males:
The reproductive phase in human males begins at puberty and continues throughout life. Unlike females, males do not experience a cessation of reproductive capability like menopause. Sperm production continues, though it may decline with age.
Q42. Which of the following is a common change during puberty for both boys and girls?
Development of pubic and axillary (armpit) hair is a common change during puberty for both boys and girls. Growth of facial hair and deepening of voice are specific to boys, while widening of hips is more prominent in girls. Pubic and armpit hair development occurs in both sexes.
Q43. The hormone progesterone, produced by the ovaries, is primarily responsible for:
Progesterone, produced by the ovaries, is primarily responsible for maintaining the uterine lining during pregnancy and preparing the body for implantation. Sperm production is regulated by testosterone, and growth of facial hair and deepening of voice are male characteristics influenced by testosterone.
Q44. The initial sign of puberty in boys is often:
The initial sign of puberty in boys is often the enlargement of the testes. This is followed by other changes such as growth of pubic hair, voice deepening, growth of facial hair, and broadening of shoulders. Voice cracking and facial hair appear later in the sequence.
Q45. The initial sign of puberty in girls is often:
The initial sign of puberty in girls is often the enlargement of breasts. This is followed by the growth of pubic and underarm hair, a growth spurt, and eventually the onset of menstruation. Widening of hips also occurs, but breast development is usually the first visible sign.
Q46. Hormones are transported to their target organs through:
Hormones are transported to their target organs through the bloodstream. Endocrine glands release hormones directly into the blood, which carries them to specific target organs. Nerves transmit electrical signals, lymphatic vessels carry lymph, and the digestive system processes food.
Q47. Which of the following correctly describes the role of the pituitary gland in reproductive function?
The pituitary gland releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which stimulate the testes (to produce testosterone) and ovaries (to produce estrogen). It does not produce testosterone or estrogen directly. It is directly involved in reproduction through these stimulating hormones.
Q48. A person with XX chromosomes will have:
A person with XX chromosomes will have ovaries and develop as female. The presence of XX chromosomes determines femaleness. A person with XY chromosomes will have testes and develop as male. Both testes and ovaries are not present in normal development.
Q49. A person with XY chromosomes will have:
A person with XY chromosomes will have testes and develop as male. The presence of the Y chromosome triggers male development. A person with XX chromosomes will have ovaries and develop as female. Both testes and ovaries are not present in normal development.
Q50. Why is it important to understand the role of hormones and chromosomes in reproduction?
Understanding the role of hormones and chromosomes in reproduction is important to understand the changes during adolescence, determine sex, and maintain reproductive health. It helps individuals understand their bodies and make informed decisions. It is not about delaying puberty, stopping the menstrual cycle, or preventing growth.