Grade 7 : Science (Curiosity) - 6. Adolescence (Set 10)

Question 1

Which of the following accurately describes the primary negative feedback mechanism regulating testosterone production in adolescent males?

Accepted Answer

C) High testosterone levels inhibit the hypothalamus and pituitary from releasing GnRH, LH, and FSH.

Answer

A) High testosterone levels stimulate the hypothalamus to release GnRH.

Answer

B) Low testosterone levels inhibit the pituitary from releasing LH and FSH.

Answer

D) Estrogen directly stimulates the testes to produce more testosterone.

Answer

E) Progesterone acts as a positive feedback to increase GnRH release.

Question 2

The deepening of an adolescent male's voice is primarily due to the lengthening and thickening of which specific structure?

Accepted Answer

C) Vocal cords within the larynx

Answer

A) Trachea cartilage

Answer

B) Esophagus muscles

Answer

D) Pharynx wall tissues

Answer

E) Bronchial tubes

Question 3

In adolescent females, the initiation of the menstrual cycle, known as menarche, is directly triggered by which of the following events?

Accepted Answer

D) A surge in estrogen levels causing the endometrial lining to thicken and then shed.

Answer

A) Full development of the mammary glands.

Answer

B) Reaching a critical body fat percentage, signaling the hypothalamus.

Answer

C) Completion of the secondary oocyte formation in the ovaries.

Answer

E) The final maturation of the external genitalia.

Question 4

The prefrontal cortex, a region of the brain responsible for executive functions like decision-making, impulse control, and planning, undergoes significant maturation during adolescence. Which of the following best characterizes this developmental process?

Accepted Answer

C) Pruning of unused synapses and strengthening of active neural connections.

Answer

A) Rapid increase in new neuron generation (neurogenesis) in the prefrontal cortex.

Answer

B) Decrease in myelination of neural pathways, leading to slower processing.

Answer

D) Complete formation of the hippocampus, crucial for memory consolidation.

Answer

E) Reduction in cerebral cortex volume, indicating specialization.

Question 5

The rapid increase in height during an adolescent growth spurt is primarily attributed to increased cell division and cartilage replacement with bone in which specific regions of long bones?

Accepted Answer

D) Epiphyseal plates (growth plates)

Answer

A) Diaphysis

Answer

B) Medullary cavity

Answer

C) Periosteum

Answer

E) Articular cartilage

Question 6

Acne, a common skin condition during adolescence, is primarily caused by the overactivity of which type of gland, leading to clogged pores and inflammation?

Accepted Answer

C) Sebaceous glands

Answer

A) Sweat glands (eccrine glands)

Answer

B) Lacrimal glands

Answer

D) Salivary glands

Answer

E) Endocrine glands

Question 7

A 15-year-old girl shows no signs of breast development or menarche, while her peers have completed these milestones. Which of the following is most likely a primary medical cause for this delayed puberty, excluding nutritional deficiencies or chronic illness?

Accepted Answer

C) Hypogonadotropic hypogonadism, involving insufficient GnRH from the hypothalamus.

Answer

A) Excessive production of growth hormone.

Answer

B) Ovarian cysts causing premature ovarian failure.

Answer

D) Hyperthyroidism leading to rapid metabolism.

Answer

E) Adrenal hyperplasia causing excess androgen production.

Question 8

While genetics play a significant role, research indicates that various environmental factors can influence the timing of puberty. Which of the following environmental factors has been most consistently linked to earlier onset of puberty in recent decades?

Accepted Answer

B) Exposure to certain endocrine-disrupting chemicals (EDCs) in the environment.

Answer

A) Increased physical activity and sports participation.

Answer

C) Consumption of organic, unprocessed foods.

Answer

D) Living in colder climates.

Answer

E) Higher socioeconomic status and reduced stress.

Question 9

In an adolescent male, the process of spermatogenesis continuously produces sperm in the testes. This process involves a specialized type of cell division. What is the primary purpose of meiosis in spermatogenesis and oogenesis?

Accepted Answer

B) To reduce the chromosome number by half (haploid) and introduce genetic variation.

Answer

A) To produce genetically identical diploid cells for growth.

Answer

D) To increase the overall size of the reproductive organs.

Answer

E) To synthesize hormones like testosterone and estrogen.

Question 10

According to Erik Erikson's stages of psychosocial development, adolescents primarily grapple with which central conflict during their developmental stage?

Accepted Answer

D) Identity vs. Role Confusion

Answer

A) Trust vs. Mistrust

Answer

B) Autonomy vs. Shame and Doubt

Answer

C) Industry vs. Inferiority

Answer

E) Intimacy vs. Isolation