Q1. [3]
Taking the example of any two animal hormones along with their gland of secretion, explain how these hormones help (i) in growth and development and (ii) regulate metabolism, in the body.
Previously asked in CBSE board exam
2024 31/5/1 Q29
Generated by claude-sonnet-4-6 · 2026-06-15 06:49 · grounding rag
Model Answer
Two animal hormones:
- Thyroxin (secreted by the thyroid gland) — regulates the rate of metabolism (carbohydrates, fats, and proteins). It also controls body growth and development. Deficiency causes goitre.
- Testosterone (secreted by the testes) — regulates the formation of sperms and brings about changes in appearance (voice, facial hair, muscle growth) during puberty, thus controlling growth and development.
Both hormones are regulated by a feedback mechanism to maintain balance in the body.
Source: Chapter 6 (Control and Coordination); Chapter 7 (Reproduction)
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Explanation
- The question asks for two hormones, their glands, and their role in (i) growth and development and (ii) metabolism — address all parts.
- Thyroxin is the classic example for metabolism; testosterone is directly mentioned in the source passage for growth/development at puberty.
- Mentioning the feedback mechanism earns an extra point and shows conceptual understanding.
- Avoid writing lengthy paragraphs — examiners reward concise, point-wise answers for 3-mark questions.
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