CBSE Class 11 Biology NCERT Solutions: Chapter 18, Body Fluids and Circulation

If you want to make your exam preparation an easy and organised task then solving the NCERT questions is the best practice. Here, we bring the NCERT solutions explained by the subject matter experts. Download the NCERT solutions in PDF format.

Created On: Aug 9, 2018 17:20 IST
Body Fluids and Circulation: NCERT Solutions
Body Fluids and Circulation: NCERT Solutions

Students who are having trouble finding the right and simple answers for questions given in Class 11 Biology NCERT book, can refer the answers given by experts at

In this article we are providing the NCERT solutions for Class 11 Biology chapter – Body Fluids and Circulation. All these model solutions have been prepared in the simplest way so that students can easily understand the concept and theories involved in each solution. NCERT solutions provided here will make learning easier and simpler than ever before.

All the class 11 Biology NCERT solutions have been collated in PDF format which students may easily download totally free. 

Some of the questions and their solutions from NCERT Solutions for Class 11: Body Fluids and Circulation, are as follows:

Q. Name the components of the formed elements in the blood and mention one major function of each of them.

Ans. Components of the formed elements in the blood are:

(i) Erythrocytes: They play a significant role in the transportation of respiratory gases.

(ii) Leukocytes: They help to fight against the infections and are responsible for the immune system in the body.

(iii) Platelets: They help in the coagulation of blood.

CBSE Class 11 Biology Syllabus 2018 - 2019

Q. What is the importance of plasma proteins?

Ans. Plasma is constituted by proteins such as fibrinogens, globulins, and albumins. Fibrinogen play An important role in the clotting of blood. Globulin is a major protein of the plasma that protects the body against infecting agents. Albumin helps in maintaining the osmotic balance.

Q. Why do we consider blood as a connective tissue?

Ans. Like the other connective tissues, blood is also mesodermally derived and has an extra-cellular matrix called plasma. It connects different body systems and takes part in the transportation of oxygen and various nutrients inside the body and removal of the waste materials out of the body . Hence, blood is considered as a connective tissue.

Q. What is meant by double circulation? What is its significance?

Ans. Double circulation: In this process, blood passes twice through the heart during one complete cycle. This process involves two types of blood circulations:

(i) Systemic circulation:  It involves the circulation of oxygenated blood from the left ventricle of the heart to the aorta. Then a network of arteries, arterioles, and capillaries supplies this oxygenated blood to various tissues in the body. From tissues,  the deoxygenated blood is collected by a system of venules, veins, and vena cava, and is emptied into the right artium.

(ii) Pulmonary circulation: It involves the circulation of deoxygenated blood from right ventricle to the pulmonary artery, which then carries blood to the lungs for oxygenation. Then. the oxygenated blood from lungs, is carried by the pulmonary veins into the left atrium.

Significance of double circulation: In double circulation there is a complete separation of oxygenated and deoxygenated blood which allows a more efficient supply of oxygen to the body cells.

Get the complete the NCERT solutions for Class 11: Body Fluids and Circulation, from the following link:

Class 11 Biology NCERT Solutions: Body Fluids and Circulation

Class 11 Biology NCERT Chapter: Body Fluids and Circulation

Before solving the questions given in the Class 11 Biology NCERT chapter- Body Fluids and Circulation, 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: Body Fluids and Circulation are:

  • Blood


                  Formed elements

                  Blood groups

  • Coagulation of blood
  • Lymph (tissue fluid)
  • Circulatory pathways
  • Human circulatory system
  • Cardiac cycle
  • Electrocardiograph (ecg)
  • Double circulation
  • Regulation of cardiac activity
  • Disorders of circulatory system. 

Disorders of respiratory system. Find below the link to download the complete Chapter:

Class 11 Biology NCERT Chapter: Body Fluids and Circulation

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