NCERT Solutions for class 11 Biology Chapter 18: Body Fluids and Circulation

NCERT Solutions for Class 11 Biology Chapter 18 Body Fluids and Circulation are provided in the article below. It comprises all the important definitions, concepts, and methodologies that will be really beneficial for the students. The important topics that are included in this chapter are:

Coagulation of Blood
Composition of lymph and its function
Human Circulatory System
Double circulation
Regulation of cardiac activity
Disorders of the Circulatory System

Expected no. of Questions: 2-3 questions of around 4 marks.

Download PDF: NCERT Solutions for Class 11 Biology Chapter 18 Body Fluids and Circulation

NCERT Solutions for Class 11 Biology Chapter 18

Class 11 Biology Chapter 18 Body Fluids and Circulation: Important Topics

The fluid which is formed in the body of any complex lifeform carrying nutrients throughout the body and helping in excretion is known as body fluids. The two most important body fluids are blood and lymph. The different types of body fluids are:

Blood

The main components of blood include:

Plasma: It is the liquid component of blood and is a thick fluid containing 55% blood, 90% water, and 8% proteins. Albumin is the major protein in plasma.
Red Blood Cells: 40% of the blood contains red blood cells. RBCs contain protein hemoglobin that gives a red color to the blood.
White Blood Cells: The white blood cells are very few in number. They mainly protect the body against infections.
Platelets: These are fewer in number than the red blood cells and help in the clotting of blood at the site of a wound.

Lymph

Lymph is a colorless fluid present in the interstitial tissues, which circulates throughout the lymphatic system. It can be referred to as blood without the RBCs. The exchange of nutrients, hormones, and gases occurs through this fluid. It comprises lymphocytes that play a major function in the immune responses of the body.

Chapter Related Links:

Blood	Lymph	Electrocardiograph
Double Circulation	Heart Diagram with Labels & Detailed Explanation	Heart Attack Symptoms in Men & Women

CBSE Class 11 Biology Study Guides:

CBSE Class 11 Biology Syllabus	CBSE Class 11 Biology NCERT Textbook	CBSE Class 11 Biology Sample Paper
Biology Study Material	Biology MCQs	Difference between in Biology

CBSE CLASS XII Related Questions

1.
Study the diagram given below and answer the questions that follows:

(a) Identify the structure shown in the above figure.
(b) Identify the labels P and Q.
(c) Write the nature of histone proteins.
(d) Distinguish between Euchromatin and Heterochromatin.
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2.
Describe the structure and working of a sparged stirred-tank bioreactor.
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3.
If Meselson and Stahl's experiment is continued for 80 minutes (till III generation), what would be the ratio of DNA containing N$^{15}$/N$^{15}$ : N$^{15}$/N$^{14}$ : N$^{14}$/N$^{14}$ in the medium?
- 1 : 1 : 0
- 1 : 1 : 3
- 0 : 1 : 8
- 1 : 4 : 0
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4.
The following question is based on pollination. Study the figures carefully and answer the questions that follow.
- Give the scientific terms for the processes taking place in Figures A and B respectively.
- Mention two conditions necessary for the process occurring in Figure B.
- - [(i)] State one advantage and one disadvantage of the process occurring in Figure B.
    OR
  - [(ii)] Name one plant where, in some flowers only, the process in Figure B takes place and give the reason responsible for it.
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5.
(a) Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of biodiversity. Justify by taking one example for each.
(b) State the importance of the following:
(i) IUCN Red data list
(ii) Hot spots in conservation of biodiversity
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6.
1. Perform a cross between two sickle cell carriers. What ratio is obtained between carrier, disease free and diseased individuals in F1 progeny? Name the nitrogenous base substituted, in the haemoglobin molecule in this disease.
2. Explain the difference in inheritance pattern of flower colour in garden pea plant and snap-dragon plant with the help of monohybrid crosses.
OR,
Explain with the help of well-labelled diagrams how lac operon operates in E. coli :
1. In presence of an inducer.
2. In absence of an inducer.
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