NCERT Solutions for Class 9 Science Chapter 6 Tissues
Chapter Name | NCERT Solutions for Class 9 Science Chapter 6 Tissues |
Topics Covered |
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Related Study |
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NCERT Intext Questions
1. What is a tissue?
Solution
Tissue is a group of cells that are similar in structure and are organised together to perform a specific task.
2. What is the utility of tissues in multicellular organisms?
Solution
The different types of tissues perform different functions in multicellular organisms. Since a particular group of cells carry out only a particular function, they do it very efficiently. So, multicellular organisms exhibited a definite division of labour.
3. Name various types of simple tissues.
Solution
4. Where is apical meristem found?
Solution
Apical meristem is present at the growing tips of stem and roots.
5. Which tissue makes up the husk of coconut?
Solution
Sclerenchyma tissue makes up the husk of coconut.
6. What are the constituents of phloem?
Solution
The constituents of phloem are :
- Sieve tubes
- Companion cells
- Phloem parenchyma
- Phloem fibres
7. Name the tissue responsible for movement in our body.
Solution
Muscular tissue.
8. What does a neuron look like?
Solution
Neuron looks like a star shaped cell with a tail.
9. Give three features of cardiac muscles.
Solution
Three features of cardiac muscles:
- Cardiac muscles are involuntary muscles that contract quickly, but do not get fatigued.
- The cells of cardiac muscles are cylindrical, branched, and having one nucleus.
- They control the contraction and relaxation of the heart.
10. What are the functions of areolar tissue?
Solution
Functions of areolar tissue :
- It helps in supporting internal organs.
- It helps in repairing the tissues of the skin and muscles.
NCERT Exercise Solutions
1. Define the term “tissue”.
Solution
Tissue is a group of cells that are similar in structure and are organized together to perform a specific task.
2. How many types of elements together make up the xylem tissue? Name them.
Solution
Xylem is made up of following elements :
- Tracheids
- Vessels
- Xylem parenchyma
- Xylem fibres
3. How are simple tissues different from complex tissues in plants?
Solution
Difference between Simple Tissue and Complex Tissue:
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Simple Tissue |
Complex Tissue |
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These tissues consist of only one type of cells. |
These tissues are made up of more than one type of cells. |
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The cells are more or less similar in structure and perform similar functions. |
Various types of cells perform various functions. For example : In the xylem tissue, tracheids help in water transport, whereas parenchyma stores food. |
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Three types of simple tissues in plants are parenchyma, collenchyma, and sclerenchyma. |
Two types of complex permanent tissues in plants are xylem and phloem. |
4. Differentiate between parenchyma, collenchyma and sclerenchyma, on the basis of their cell wall.
Solution
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Parenchyma |
Collenchyma |
Sclerenchyma |
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Cell walls are relatively thin, and the cell in parenchyma tissues are loosely packed. |
The cell wall is irregularly thickened at the corners, and there is very little space between the cells. |
The cell walls are uniformly thickened, and there are no intercellular spaces. |
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The cell wall in this tissue is made up of cellulose. |
Pectin and hemicellulose are the major constituents of the cell wall. |
An additional layer of the cell wall composed mainly of lignin is found. |
5. What are the functions of the stomata?
Solution
The functions of stomata are :
- Exchange of gases (CO2 and O2) in atmosphere,
- Transpiration that is the loss of excess water in the form of water vapour.
6. Diagrammatically show the difference between the three types of muscle fibres.
Solution
The three types of muscle fibres are: Striated muscles, smooth muscles (unstriated muscle fibres), and cardiac muscles.
Figure: (a) Striated muscle fibres, (b) Unstriated muscle fibres, (c) Cardiac muscle fibres
7. What is the specific function of the cardiac muscle?
Solution
The specific function of the cardiac muscle is to control the contraction and relaxation of the heart.
8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/ location in the body.
Solution
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Striated muscle |
Unstriated muscle |
Cardiac muscle |
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On the basis of structure: Cells are cylindrical. |
Cells are long. |
Cells are cylindrical. |
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Cells can have moire than one mucleus. |
Cells have single nucleus. |
Cells have single nucleus. |
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Cells are not branched. |
Cells are not branched |
Cells are not branched. |
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Its ends are blunt. |
Its ends are tapering. |
Its ends are flat and wavy. |
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On the basis of location : These muscles control the working of body parts such as hands, legs, tongue, etc. |
These muscles control the movement of food in the alimentary canal, the contraction and relaxation of blood vessels, etc. |
These muscles control the contraction and relaxation of the heart. |
9. Draw a labelled diagram of a neuron.
Solution
10. Name the following :
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in human.
(c) Tissue that transports food in plants.
(d) Tissue that stores fat in our body.
(e) Connective tissue with a fluid matrix.
(f) Tissue present in the brain.
Solution
(a) Epithelial tissue
(b) Tendon
(c) Phloem
(d) Adipose tissue
(e) Blood
(f) Nervous tissue
11. Identify the type of tissue in the following : skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Solution
- Skin : Stratified squamous epithelial tissue
- Bark of tree : Simple permanent tissue
- Bone : Connective tissue
- Lining of kidney tubule : Cuboidal epithelial tissue
- Vascular bundle : Complex permanent tissue
12. Name the regions in which parenchyma tissue is present.
Solution
Leaves, fruits, and flowers are the regions in which parenchyma tissue is present.
13. What is the role of epidermis in plants?
Solution
Epidermis is present on the outer surface of the entire plant body and responsible for following functions :
(i) It protects tissue of the plant body.
(ii) It protects the plant against mechanical injury.
(iii) It allows exchange of gases through the stomata.
14. How does the cork act as a protective tissue?
Solution
The bark of a tree is known as the cork which is made up of dead cells. Thus, it protects the plant against injury, extreme temperature, etc. It also prevents the loss of water by evaporation.
15. Complete the table :
Solution