NCERT Solutions Class 11 Biology Chapter 17

NCERT Solutions for Class 11 Biology Chapter 17 

Most CBSE students find it difficult to answer the questions in the chapter Breathing and Exchange of Gases because of the complexity of various concepts it covers. Students will be able to write better answers by referring to the NCERT Solutions for Class 11 Biology Chapter 17. The solutions are explained in simple language which makes it easy to understand. Students can use the NCERT Solutions for Class 11 Chapter 17 by Extramarks as a guide to improve their answer writing skills and have a deeper understanding of the concepts.

NCERT Solutions for Class 11 Biology Chapter 17 – Breathing and Exchange of Gases 

The NCERT Solutions for Class 11 Biology Chapter 17 – Breathing and Exchange of gases are easy to understand and learn. The study materials act as a guide that students can refer to while answering the questions given at the end of Chapter 17 in the NCERT textbook. 

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Access NCERT Solutions for Class 11 Biology Chapter 17 – Breathing and Exchange of Gases 

NCERT Biology Class 11 Breathing and Exchange of Gases 

Class 11 Biology covers vast topics, thus, it is important for students to dedicate a fixed time to revise all the concepts discussed in the textbook. They must also attempt the questions given at the end of the chapter as a part of the revision strategy.

However, finding the right answers to textbook questions is usually a difficult and time-consuming task. Students need not worry, as Extramarks provides solutions to the questions of Class 11 NCERT Biology Chapter 17 – Breathing and Exchange. The solutions have been prepared by subject matter experts, which makes them reliable. 

The solutions provided are precise and clear. The NCERT Solutions for Class 11 Chapter 17 – Breathing and Exchange by Extramarks will help students save ample time, which can be used for solving sample papers, attempting mock tests, or revising other topics.

NCERT Solutions for Class 11 Biology Chapter 17 

Chapter 17 of Class 11 Biology covers many theories, definitions, and explanations of concepts related to breathing and the exchange of gases. The chapter contains a number of illustrations and diagrams that explain the human respiratory system, transportation of carbon dioxide, and many other processes involved in respiration. The hazardous effects of air pollution and smoking are taught to the students so that they become aware and could be responsible towards nature and take care of their health as well. Students will also be taught the importance of diet and the beneficial effects brought by following a good diet plan. 

There are practice questions given at the end of the chapter to help students gauge their understanding of whatever they have read so far in Chapter 17. If students are looking for accurate answers to these questions or need to cross-check the answers that they have written, Chapter 17 Biology for Class 11 NCERT Solutions by Extramarks is the learning aid to rely upon.

Marks Distribution of NCERT Solutions Class 11 Biology Chapter 17 Breathing and Exchange of Gases  

Unit V, Human Physiology, consists of seven chapters altogether, including the chapter on Breathing and Exchange of Gases. The entire unit carries 18 marks in the final examinations. It has a weightage of 20 percent in NEET. 

Benefits of NCERT Solutions Class 11 Biology Chapter 17 Breathing and Exchange of Gases

Students will be well-prepared and confident after studying the Chapter 17 Biology Class 11 NCERT Solutions. They will be able to provide well-structured and concise answers in their examination. Other benefits of NCERT Solutions include:

  • The answers have been compiled by subject experts, which makes them a reliable source for students. 
  • The textbook solutions are answered in a detailed way and diagrams are drawn wherever necessary to enhance the students’ understanding of the concepts. 
  • The answers are written according to the guidelines given by CBSE.
  • The solutions have all the answers in one place and hence can be used for a quick revision or practise by students before their examinations. 

Related Questions

Lenticels are involved in 

  1. Transpiration
  2. Gaseous exchange 
  3. Food transport 
  4. Photosynthesis 

Ans. Gaseous exchange

Aerosols having carbon and fluorine compounds are chiefly released by 

  1. Refineries 
  2. Automobiles
  3. Industries 
  4. Jets 

Ans. Jets

 

FAQs (Frequently Asked Questions)

Both the neurological and chemical systems are involved in respiration. The Medulla Oblongata and Pons Varolii consist of a large cluster of neurons that forms the respiratory centre of the brain. The rate and depth of breathing come under the control of the respiratory system.

The dorsal respiratory group of neurons is found in the dorsal part of the medulla oblongata. The main function of these neurons is the control and regulation of inspiration.

In the ventrolateral region of the medulla oblongata, there are a series of neurons called the ventral group. These neurons can both cause inspiration and exhalation. 

Respiration is chemically controlled by chemoreceptors in the carotid and aortic bodies. Excess amounts of carbon dioxide or hydrogen ions stimulate the respiratory centre in the brain which in turn increases the inspiratory and expiratory impulses to the respiratory muscles. An increase in carbon dioxide causes acidosis. The role of oxygen in the respiratory rhythm is very little. 

A curve known as the oxygen haemoglobin dissociation curve depicts the relationship between partial pressure of oxygen (pO2) and percent saturation of haemoglobin with oxygen (O2) (also called oxygen dissociation curve)

The sigmoidal pattern of the haemoglobin oxygen dissociation curve is because of two features that are responsible for the transport of oxygen. The two features are as follows:

  • The comparatively flat segment of the curve depicts the considerable increase in oxygen tension beyond pO2 of 70-80 mm Hg; minimum oxygen loss from haemoglobin occurs. 
  • Any additional increase in drops of pO2 below 40 mm results in a disproportionately higher release of oxygen from haemoglobin. It causes the curve to appear sigmoid and results in a steeper portion of the curve. 

When fresh air enters the lungs, this process is known as inspiration. The diaphragm, intercostal muscles, and abdominal muscles all play a vital role. The most important muscles involved in the process of inspiration are the diaphragm and the external intercostal muscles. The diaphragm and intercostal muscles contract, thereby increasing the volume of the thoracic cavity. Relaxation of the abdominal muscles occurs during inspiration, allowing the diaphragm to compress the abdominal organs. As a result of this, the overall volume of the thoracic cavity grows, and the air pressure in the lungs decreases. Because of higher pressure outside the body, the air now flows into the lungs. This is the order in which air flows during inspiration. 

For the proper diffusion of gases, the region should meet the following criteria to be capable enough for the process to take place. They are:

  • The membrane should be permeable to gases and should be thin and moist too.
  • It should have a large surface area.
  • It should have high vascularity.

All these criteria are met by the alveolar membrane and hence it is the most suitable part to carry out the diffusion of gases over the other parts of the respiratory system.

As the altitude increases, the rate of oxygen in the atmosphere decreases. As the man climbs higher, it becomes difficult for him to breathe due to the decrease in oxygen supply to the blood. Because of the lower oxygen supply to the blood, the respiratory rate increases, making it difficult to breathe. The blood is in constant need of oxygen. To supply the blood with oxygen, the heart rate of the man also increases. 

Insects have a trachea system which is a combination of tubes. The exchange of gases happens in this trachea system. Spiracles are small openings present on the side of the insect’s body which play an important role in absorbing oxygen for the body. The spiracles are connected to the trachea. The oxygen is transported to the trachea via the spiracles. The oxygen starts to diffuse in the body, whereas carbon dioxide is taken out of the body. From the cell of the body, CO2 travels to the trachea and exits the body through the spiracles.