Nature And Determinants Of Development

Adolescence (11–20 years)

Step 1: Adolescence spans from approximately 11 to 20 years of age. Step 2: This stage is marked by puberty — rapid physical and hormonal changes that trigger sexual maturity. Step 3: Adolescents also develop the ability for abstract thinking, stronger peer relationships, and a growing sense of personal identity. Step 4: Middle childhood (6–11 years) is characterized by school learning, literacy, and basic friendships — not puberty. Step 5: Early adulthood involves forming intimate relationships, marriage, and career. Early childhood focuses on language, play, and motor skill refinement. There

Working life with the responsibility of raising and maintaining a family within a social context

Step 1: The four Ashramas in the Hindu view are Brahmacharya, Grihastha, Vanaprastha, and Sanyasa. Step 2: Grihastha is the second Ashrama — it represents the 'householder' stage, focused on working life, raising a family, and fulfilling social responsibilities. Step 3: Option A describes 'Sanyasa' — the final stage of complete renunciation. Step 4: Option B describes 'Brahmacharya' — the student stage of learning under a Guru. Step 5: Option C describes 'Vanaprastha' — the retirement/seclusion stage after family duties are done. Therefore, Option D correctly describes Grihastha.

46 chromosomes in 23 pairs

Step 1: At conception, the mother's ovum and the father's sperm unite to form a new cell called a zygote. Step 2: The nucleus of each human cell contains chromosomes — thread-like structures that carry genetic information. Step 3: Human cells have 46 chromosomes arranged in 23 pairs. Step 4: One member of each pair comes from the mother, and the other from the father — so we inherit 23 chromosomes from each parent. Step 5: Options A, C, and D have incorrect numbers. The correct fact from the chapter is 46 chromosomes in 23 pairs — this is an important biological fact about heredity.

Genotype is the actual genetic material a person carries (including unexpressed traits); Phenotype is the characteristic that is actually displayed

Step 1: Genotype refers to a person's actual genetic heritage — the complete set of genes they carry, including traits that are not visibly expressed. Step 2: Phenotype refers to the characteristics that are actually displayed or observable, such as eye colour, height, or skin colour. Step 3: Phenotype is shaped by both the genotype AND the environment — so two people with the same genotype can have different phenotypes if raised in different environments. Step 4: Option A reverses the definitions — a common mistake students make. Step 5: Option D is completely wrong — genotype and phenotype a