NCERT Solutions for Class 11 Biology Chapter 7 : Structural Organisation in Animals

NCERT Solutions for Class 11 Biology Chapter 7 Structural Organisation in Animals are provided in the article below. It covers all the important definitions, concepts, and methodologies that will be really beneficial for the students appearing for CBSE Class 11 Exam 2022-23. The important topics that are included in this chapter are:

Structural organisation in Earthworm
Structure organisation in Cockroach
Structure organisation in Frogs
Unicellular organisms
Multicellular creatures

Expected no. of Questions: 1-2 questions of around 3 marks.

Download PDF: NCERT Solutions for Class 11 Biology Chapter 7 Structural Organisation in Animals

NCERT Solutions for Class 11 Biology Chapter 7

Class 11 Biology Chapter 7 Structural Organisation in Animals: Important Topics

The structural organisation in animals or in any other living things is all same at the fundamental level, which means, all life living on earth is made up of cells. And when cells get together, they form tissues, which in turn, form organs and organ systems. So, the structural organisation in animals begins with the smallest fundamental unit – the cell. And a group of cells that perform a similar function forms tissues. When tissues group together to perform specific functions, they form organs.

Cells → Tissues → Organs → Organ systems

Unicellular Organisms

Single cells are known as unicellular organisms. All the life processes including digestion, excretion, and respiration in a unicellular organism, occur within a single cell. These cannot be seen by naked eyes and are therefore called microorganisms. Some of the examples of unicellular organisms such as bacteria, protozoa, algae, fungi, etc.

There are two types of unicellular organisms:

Prokaryotes: These are unicellular organisms without a true nucleus, and very small in size from 0.1 to 5.0 µm. This facilitates the diffusion of ions and molecules to different parts of the cell.
Eukaryotes: These are larger than prokaryotes, with a membrane-bound nucleus, and the DNA is present in the nucleus of the cell. Eukaryotes can be plant cells or animal cells.

Multicellular Organisms

In multicellular animals, a group of similar cells along with intercellular substances perform a specific function. Such an organization is called tissue. These tissues are organized in specific proportions and patterns to form an organ like the stomach, lung, heart, and kidney for the designed structure of a human body or any complex life form.

Following are the examples of multicellular organisms:

Humans
Dogs
Cows
Cats
Chicken
Trees
Horse

Chapter Related Links:

Animal Tissues	Organ and organ system	Invertebrates
Difference Between Ligaments and Tendons	Skin Diagram & Detailed Illustration	Vermiculture
Glandular Epithelium	Cockroach Life Cycle	Animal Tissue Types

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.
The process of copying genetic information from template strand of DNA into RNA is called transcription. It is mediated by RNA polymerase. Transcription takes place in the nucleus of eukaryotic cells. In transcription, only a segment of DNA and only one of the strands is copied into RNA.
2.
Study the given chart showing evolution of plants. Answer the following questions :
3.
Mention the source and the functions of the above mentioned hormones.
View Solution
4.
Draw the structure of an antibody molecule and label any four of its parts.
View Solution
5.
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
6.
How does a chromosomal disorder differ from a Mendelian disorder ? Write one example for each.
View Solution