Q&A/Class 10/Biology

(a) What are “hormones”? (b) List four characteristics of hormones (c) Name the hormone required for the following: Functioning of mammary glands Regulation of calcium and phosphate Lowering of blood glucose Development of moustache and beard in human malc.

Class 10CBSEBiologyChapter: Control and Coordination
👁 11 views👍 0 helpful
Definition: Hormones (Gk. hormein— to excite) are chemical messengers or informational molecules produced by ductless glands which are translocated by circulatory system to other body parts for inducing and coordinating their activities including growth. First hormone, secretin, was discovered by Bayliss and Starling (1902). The term hormone was coined by Starling (1905)
Characteristics:
  • Hormones are produced by endocrine or ductless glands.
  • They are poured into circulatory system for passage to different body parts.
  • Target Sites. Hormones act on specific cells, tissues and organs called target sites, generally away from the place of their synthesis.
  • They function as chemical messengers or informational molecules that trigger specific chemical and physiological processes of target cells.
  • Slow Action. Since hormones reach the target sites through blood, their effect appears after a lag period. They are slow acting with the exception of adrenaline.
  • Chemical Nature. Hormones are small sized organic molecules which are of diverse origin— proteins, peptides, amino acids, amines and steroids.
  • Non-nutrient Nature. Hormones are nonnutrient in nature. They have no role in providing energy or body building materials. Hormones take part in stimulation or inhibition of physiological processes.
  • The hormones are effective in very low concentration, e.g., adrenaline one in 300 million parts.
  • It is very specific. TSH acts only on thyroid while thyroxine affects all body parts.
  • Hormones are generally produced in response to specific stimuli.
  • Hormones are ultimately broken down or consumed during their activity in target cells.
  • Deficiency or Excess. Both deficiency and excess of hormone are harmful, often leading to serious disorders.
The Hormone are Required:
  • Functioning of Mammary Glands. Prolactin.
  • Regulation of Calcium and Phosphate in Blood. Parathormone.
  • Lowering of Blood Glucose. Insulin.
  • Development of Moustache and Beard in Human Male. Testosterone.

🔄Recently Updated

Name the hormone responsible for regulation of • Metabolism of carbohydrates, fats and proteins • Balance of calcium and phosphate • Blood pressure • Water and electrolyte balance.

Updated 1/12/2026

In the food chain Grass → Deer → Lion operating in a forest, what will happen if all the (a) Lions are removed (b) Deer are removed.

Updated 1/12/2026

Why is DNA copying an essential part of the process of reproduction?

Updated 1/12/2026

What is internal energy reserve in plants? Do the animals have the same energy reserve? Justify your answer.

Updated 1/12/2026

Mention the information source of making proteins in the cell. What is the basic event in reproduction?

Updated 1/12/2026

LIMITED TIME OFFER

Ace Your Exams with
Expert Guidance

Get access to 35 lakh+ verified solutions, video lectures, and personalized study plans

Verified Solutions
Expert Teachers
24/7 Support

Start Your Free Trial

No credit card required. Cancel anytime.

Get Started Free →
Secure & Trusted by 10,000+ Students

By signing up, you agree to our Terms & Privacy Policy

Start learning with 25k+ students around the world.

80+
Online courses
100+
Certified Instructor
99.9%
Success Rate
Rarepillar Education Services Private Limited
© 2025 All Rights Reserved