One can prepare effectively for an exam only when he/she gets a clear understanding of all the concepts and topics to be tested in that exam. This can be achieved by a thorough learning of each topic and an intensive practice of the questions based on those topics. NCERT books are considered to be the best source for strengthening the fundamentals of a subject and clearing all the concepts. Moreover, the different types of questions given in NCERT books are perfect to assess your learning. To help students access precise and comprehensive answers, we are providing NCERT solutions for Class 11 Biology. All these solutions have been explained by the subject experts and are certain to help students learn the right technique to write perfect answers in the annual exams.
In this article we are providing the NCERT solutions for Class 11 Biology chapter 7, Structural Organisation in Animals. All these NCERT solutions have been reviewed to provide you the error free content.
All the class 11 Biology NCERT solutions are available in PDF format which students may easily download free of cost.
Some of the questions and their solutions from NCERT Solutions for Class 11: Structural Organisation in Animals, are as follows:
Q. State the volume of air remaining in the lungs after a normal breathing.
Ans. The volume of air remaining in the lungs after a normal breathing is called Functional Residual Capacity (FRC). It can be measured as the sum of expiratory reserve volume (ERV) and residual volume (RV). The average value of functional residual capacity of the human lungs is about 2500 – 3000 mL.
Q. Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?
Ans. Aalveolar region has characters suitable for the efficient exchange of gases. The gaseous exchange between the alveoli and the blood capillaries surrounding the alveoli, takes place by the process of diffusion because of pressure or concentration gradient. The highly-permeable and thin membrane of the alveoli is suitable for the diffusion of gases, while other parts of the respiratory system are not structured to serve this purpose. Hence, diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system.
Q. What will be the pO2 and pCO2 in the atmospheric air compared to those in the alveolar air?
(i) pO2 lesser, pCO2 higher
(ii) pO2 higher, pCO2 lesser
(iii) pO2 higher, pCO2 higher
(iv) pO2 lesser, pCO2 lesser Answer
Ans. (ii) pO2 higher, pCO2 lesser
Q. Explain the process of inspiration under normal conditions.
Ans. Inspiration is the process of drawing air form outside the body into the lungs. It is initiated by the contraction of diaphragm which creates a pressure gradient between the lungs and the atmosphere. This contraction of diaphragm increases the volume of the thoracic chamber in the anteroposterior axis with the simultaneous contraction of external intercostal muscles which lifts up the ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorso-ventral axis. The overall increase in the thoracic volume results in a similar increase in pulmonary volume. The increase in pulmonary volume decreases the intra-pulmonary pressure to less than the atmospheric pressure. This causes a pressure gradient between the lungs and the atmosphere, which forces the air from outside to move into the lungs. Hence, inspiration takes place.
Q. What is the effect of pCO2 on oxygen transport?
Ans. Paitial pressure of carbon dioxide plays a major role in the transport of oxygen. In the alveoli, the low pCO2 and high pO2 favours the formation of haemoglobin. The oxyhaemoglobin then carries the oxygen molecules to the tissues where the high pCO2 and low pO2 favours the dissociation oxyhaemoglobin to release the oxygen at the tissues.
Get the complete the NCERT solutions for Class 11: Structural Organisation in Animals, from the following link:
Students may download the NCERT solutions for Class 11 Biology chapter- Structural Organisation in Animals, in the form of PDF.
Class 11 Biology NCERT Chapter: Structural Organisation in Animals
Before solving the questions given in the Class 11 Biology NCERT chapter- Structural Organisation in Animals, students should thoroughly read this chapter to grasp all the concepts explained in it. This will help you understand the problem discussed in a question and then come with an appropriate answer.
Main topics discussed in Class 11 Biology chapter: Structural Organisation in Animals are:
- Animal tissues
- Epithelial tissue
- Connective tissue
- Muscle tissue
- Neural tissue
- Organ and organ system
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