Class 9
Chapter 6 Tissue
solutions
In Text Questions
Page No: 69
1. What is a tissue?
Answer
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 multi-cellular organisms?
Answer
Tissues provide structural strength, mechanical strength, show division of labour.
Page 74
1. Name types of simple tissues.
Answer:
The types of simple tissues are parenchyma, collenchyma, sclerenchyma and aerenchyma.
2. Where is apical meristem found?
Answer:
Apical meristem is found at the tip of root or shoot of the plant.
3. Which tissue makes up the husk of coconut?
Answer:
The husk of coconut is made of sclerenchyma tissue.
4. What are the constituents of phloem?
Answer:
Phloem is made up of four types of elements sieve tube, companion cells, phloem fibres and phloem parenchyma.
Page 78
1. Name the tissue responsible for movement in our body.
Answer:
1. Muscular tissue, 2. Nervous tissue, combination of both the tissues are responsible for movement in our body.
2. What does a neuron look like?
Answer:
A neuron consists of a cell body with a nucleus and cytoplasm, from which long thin hair like parts arise. Each neuron has a single long part called the axon, and many small, short branched parts called dendrite. An individual nerve cell is called neuron.
3. Give three features of cardiac muscles.
Answer:
Feature of cardiac muscles
(1) Heart muscles (cardiac muscles) are cylindrical, branched and uninucleated
(2) They are striated muscle fibres.
(3) They are involuntary muscles, cannot be controlled by us.
4. What are the functions of areolar tissue?
Answer:
It fills the space inside the organs, supports internal organs and helps in the repair of tissues.
Exercise Questions
1. Define the term “tissue”.
Answer:
Group of cells that are similar in structure and perform same function is called a tissue.
2. How many types of elements together make up the xylem tissue? Name them.
Answer:
The xylem is made up of vessels, trachieds, xylem fibres and xylem parenchyma.
3. How are simple tissues different from complex tissues in plants?
Answer:
Simple tissues are made up of one type of cells which coordinate to perform a common function.
Complex tissues are made up of more than one type of cells. All these coordinate to perform a common function.
4. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Answer:
Parenchyma: The cells have thin cell walls made up of cellulose.
Collenchyma: The cells have cell walls thickened at the corners due to pectin deposition.
Sclerenchyma: Their walls are thickened due to lignin deposition.
5. What are the functions of stomata?
Answer:
Stomata help in transpiration and exchange of gases.
6. Diagrammatically show the difference between the three types of muscle fibres.
Answer:
Striated muscles
(1) They are connected to bones (Skeletal muscles).
(2) They are voluntary muscles.
(3) The cells are long, cylindrical with many nucleus and are unbranched.
Smooth muscles
(1) They are found in alimentary canal and lungs.
(2) They are involuntary muscles.
(3) They are spindle in shape and have single nucleus.
Cardiac muscles
(1) They are found in heart.
(2) They are involuntary in action.
(3) They are branched and have one nucleus.
7. What is the specific function of the cardiac muscle?
Answer:
Their rhythmic contraction and relaxation helps in pumping action of heart.
8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and location in the body.
Answer:
Answer:
10. Name the following:
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in humans.
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.
Answer:
(a) Squamous epithelium
(b) Tendons
(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.
Answer:
(a) Skin—Striated squamous epithelium
(b) Bark of tree—Cork, protective tissue
C) Bone—Connective tissue
(d) Lining of kidney tubule—Cuboidal epithelium tisse
(e) Vascular bundle—Conducting tissue
Question 12. Name the regions in which parenchyma tissue is present.
Answer:
In the pith of the roots and stems. When it contains chlorophyll, it is called chlorenchyma, found in green leaves. In aquatic plants, parenchyma contains large air cavities and help them to float. Such type of parenchyma is called aerenchyma.
13. What is the role of epidermis in plants?
Answer:
Cells of epidermis forms a continuous layer without intercellular spaces. It protects all the parts of plants.
14. How does the cork act as a protective tissue?
Answer:
The outer protective layer or bark of a tree is known as the cork. It is made up of dead cells. Therefore, it protects the plant against mechanical injury, temperature extremes, etc. It also prevents the loss of water by evaporation.
15. Complete the table:
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