NCERT Solutions For Class 11 Biology Chapter 22

NCERT Solutions For Class 11 Biology Chapter 22 PDF Free Download

NCERT solutions for class 11 biology chapter 22 Chemical Coordination and Integration is a very important resource material for students who are preparing for class 11 and entrance examinations. It provides comprehensive answers to the questions given in the textbook.

It consists of worksheets, exemplary questions, MCQ’s, long and short answer questions. By studying ncert solutions for class 11 biology chapter 22 pdf you will be able to know the pattern and type of questions asked in the examinations.

NCERT solutions for class 11 biology chapter 22 Chemical Coordination and Integration

NCERT solutions class 11 chapter 22 biology specifically deals with chemical coordination and integration. Our body is a complex machine that has many thousands of processes and functions. These are regulated by hormones and enzymes that are released under certain conditions and situations. Not only humans and animals, but plants also use chemical messengers to coordinate certain functions and processes. These might tell the plants when to shed their leaves, when to change colours, or even grow new leaves. Similarly, chemicals play an important role in humans too – for instance, when an individual reaches puberty, a lot of chemicals are released depending if the individual is a male or a female.

Subtopics of class 11 biology chapter 22 Chemical Coordination and Integration

  1. Endocrine Glands and Hormones
  2. Human Endocrine System
    1. The Hypothalamus
    2. The Pituitary Gland
    3. The Pineal Gland
    4. Thyroid Gland
    5. Parathyroid Gland
    6. Thymus
    7. Adrenal Gland
    8. Pancreas
    9. Testis
    10. Ovary
  3. Hormones of Heart, Kidney and Gastrointestinal Tract
  4. Mechanism of Hormone Action.

This chapter deals with chemical coordination and integration in organisms. Chemical messengers such as hormones and catalysts like enzymes affect various biological processes and functions in organisms. In humans, adrenaline is released when the body perceives a threat. When this chemical is released in the body, muscles tighten up, glucose is released, eyes dilate, non-essential functions cease. This helps the body to analyse the threat and decide on a course of action – it could either be running away or preparing to fight to keep the threat at bay.

Class 11 Biology NCERT Solutions Coordination and Integration Important Questions


Q9: Match the following:

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Chemical messengers such as hormones and catalysts like enzymes affect various biological processes and functions in organisms. In humans, adrenaline is released when the body perceives a threat. When this chemical is released in the body, muscles tighten up, glucose is released, eyes dilate, non-essential functions cease. This helps the body to analyse the threat and decide on a course of action – it could either be running away or preparing to fight to keep the threat at bay.

Besides this, there are other chemicals that perform various functions. The masculine features in a male are controlled by a chemical called testosterone. It promotes the growth of facial and chest hairs, bigger muscles, deeper pitch etc. Similarly, the equivalent chemical for feminine features is called estrogen. It promotes features that are characteristic of females such as regulation of the reproductive system and secondary sex characteristics. A hormone called Oxytocin is responsible for social interaction and affection. It is released during touching and hugging and is often called the “love chemical.” Similarly, so many chemicals influence various biological activities in our body.

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