Hormonal Coordination


In the field of Biology, hormonal coordination plays a pivotal role in regulating various physiological processes in both plants and animals. Endocrine glands, such as the pituitary, thyroid, adrenal, pancreas, and gonads, secrete hormones that act as chemical messengers, coordinating activities within the organism. Understanding the role of these endocrine glands and their secretions is fundamental in comprehending the complex mechanism of hormonal coordination.

One of the essential aspects of hormonal coordination is evident in the stages of metamorphosis in organisms like the toad. Thyroxine, a hormone produced by the thyroid gland, plays a crucial role in the transformation of tadpoles into mature toads. This hormone regulates the developmental stages, highlighting the significance of hormonal control in the life cycle of organisms.

Auxins, a class of plant hormones, exhibit significant effects on various aspects of plant growth and development. They influence lateral bud development, leaf fall, and the initiation of adventitious roots. The understanding of these effects provides insights into how plants respond to internal and external stimuli, showcasing the importance of hormonal coordination in plant physiology.

Furthermore, hormonal coordination plays a vital role in crop harvesting, growth, and weed control in agriculture. The precise regulation of plant hormones can enhance crop yield, promote growth, and manage weed infestations effectively. Farmers utilize knowledge of hormonal coordination to optimize agricultural practices and ensure sustainable food production.

In conclusion, studying hormonal coordination is crucial in comprehending the intricate mechanisms that govern physiological processes in living organisms. From the functions of endocrine glands to the effects of hormones on growth and development, exploring this topic provides a deeper insight into the complexity of biological regulation and adaptation.


  1. Identify the main endocrine glands and their secretions
  2. Analyze the effects of auxins on lateral bud development, leaf fall, and initiation of adventitious roots
  3. Understand the role of endocrine glands in hormonal coordination
  4. Discuss the importance of hormonal coordination in crop harvesting, growth, and weed control
  5. Explain the stages in the metamorphosis of a toad and the role of thyroxine

Lesson Note

Hormonal coordination is central to the functioning of both plants and animals. In this context, it involves the production, release, and action of hormones, which are chemical messengers that regulate various physiological processes. Through hormonal coordination, organisms can maintain homeostasis, grow, develop, and adapt to their environments.

Lesson Evaluation

Congratulations on completing the lesson on Hormonal Coordination. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

  1. The questions and answers are as follows: Which gland is responsible for the secretion of growth hormone in humans? A. Thyroid gland B. Pituitary gland C. Adrenal gland D. Pancreas gland Answer: B. Pituitary gland
  2. What is the primary function of thyroxine in the body? A. Regulate blood sugar levels B. Control calcium levels in bones C. Control metabolic rate D. Stimulate growth hormone production Answer: C. Control metabolic rate
  3. Which of the following is not a function of auxins in plants? A. Promote lateral bud development B. Induce leaf fall C. Inhibit adventitious root formation D. Enhance apical dominance Answer: C. Inhibit adventitious root formation
  4. During the metamorphosis of a toad, which stage is characterized by the development of hind limbs? A. Tadpole stage B. Froglet stage C. Juvenile toad stage D. Adult toad stage Answer: B. Froglet stage
  5. Which hormone is responsible for maintaining blood sugar levels in the body? A. Insulin B. Glucagon C. Estrogen D. Testosterone Answer: A. Insulin
  6. In plant growth, what is the term used to describe the phenomenon of cells differentiating into specialized cell types? A. Growth B. Elongation C. Differentiation D. Division Answer: C. Differentiation
  7. Which of the following is a function of the adrenal gland? A. Regulation of calcium levels in bones B. Secretion of adrenaline during "fight or flight" response C. Control of metabolic rate D. Regulation of blood sugar levels Answer: B. Secretion of adrenaline during "fight or flight" response
  8. The pancreas secretes which hormone to regulate blood glucose levels? A. Glucagon B. Thyroxine C. Estrogen D. Insulin Answer: D. Insulin
  9. Which hormone is responsible for the development of secondary sexual characteristics in males? A. Testosterone B. Estrogen C. Progesterone D. Prolactin Answer: A. Testosterone

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Past Questions

Wondering what past questions for this topic looks like? Here are a number of questions about Hormonal Coordination from previous years

Question 1 Report

 The table above shows the effect of hormones I,II,III and IV on some parts of the human body. Where (✓) represents effects and (X) represents no effect of hormone on the corresponding part of the body. study it and answer this question. 

The hormone responsible for anxiety is?

Question 1 Report

Which of the following is a plant hormone responsible for promoting cell elongation and growth?

Question 1 Report

The gland that secretes the hormone glucagon is ... gland

Practice a number of Hormonal Coordination past questions