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.
In vitro fertilization (IVF) is a popular method these days that is helping childless couples to bear a child.
Write the different steps that are carried out in this technique.
Would you consider gamete intra fallopian transfer as a type of IVF? Justify your answer.
View Solution
2.
What is meant by translation in protein synthesis?
Explain charging of tRNA (aminoacylation of tRNA) and mention its importance in the process of translation.
View Solution
3.
Draw a labelled two-celled structure of male gametophyte of an angiosperm.
Name the three layers that surround the cytoplasm of a male gametophyte starting from innermost to outermost layer.
(iii) Which organic material makes the outermost layer? Mention its advantage.
(iv) Why is the outermost layer of male gametophyte not continuous ?
View Solution
4.
Name the phenomenon that leads to situations like ‘XO’ abnormality in humans. Also name this genetic disorder. How are individuals with an XO chromosomal abnormality affected? Write its symptoms as well as karyotype.
View Solution
5.
Describe the series of experiments conducted by Frederick Griffith. Comment on the significance of the result obtained.
State the contribution of Avery, MacLeod and McCarty.
View Solution
6.
Read the following passage and answer the questions that follow:
India is one of the megadiverse countries housing around 8·1 per cent of global species diversity, although its land area is only 2·4 per cent of the world’s land area. Many of the species are highly threatened due to human activities like deforestation, mining and habitat fragmentation. Laws like Wildlife (Protection) Act, 1972 were enacted by the Government of India to preserve our biological wealth. Various conservation measures are being implemented to save the threatened species. The following bar graph shows the number of species conserved under different biodiversity conservation methods.

Which other methods shown in the diagram are opposite to the one identified by you in question ? How are these two conservation approaches different?
(c) Write two features of Biodiversity hotspots.
(c) To which category do sacred groves belong and how do they help in bio-conservation?