Topics and Sub Topics in Class 9 Science Chapter 6 Tissues:
- Tissues
- Are Plants and Animals Made of Same Types of Tissues?
- Plant Tissues
- Animal Tissues
Question 1. What is a tissue?
Answer: A group of cells that are similar in structure and work together to do a particular function is called tissue.
Question 2. What is the utility of tissues in multicellular organisms?
Answer: Tissues provide structural and mechanical strength and show division of labour.
Question 1. Name types of simple tissues.
Answer: The types of simple tissues are parenchyma, collenchyma, sclerenchyma and sclerenchyma.
Question 2. Where is apical meristem found?
Answer: Apical meristem is found at the tip of root and shoot of the plant.
Question 3. Which tissue makes up the husk of coconut?
Answer: The husk of coconut is made of sclerenchyma tissue.
Question 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.
Question 1. Name the tissue responsible for movement in our body.
Answer: 1. Muscular tissue, 2. Nervous tissue.
Question 2. What does a neuron look like?
Answer: A neuron consists of a cell body with a nucleus inside and cytoplasm, from which long thin hair like parts arise. Each neuron has a single long part called the axon, and many small branched parts called dendrite. An individual nerve cell is called neuron, approximately a metre long.
Question 3. Give three features of cardiac muscles.
Answer: Three Feature of cardiac muscles are:
(1) Heart muscles [cardiac muscles] are cylindrical, branched etc
(2) They are striated muscle fibres.
(3) They are involuntary muscles and cannot be controlled by us.
Question 4. What are the Junctions of areolar tissue?
Answer: Areolar tissue are connective tissues found in animal. It is found between skin and muscles, around blood vessels and nerves.
It fills the space inside the organs. Supports internal organs and helps in the repair of tissues.
Questions From Textbook:
Question 1. Define the term “tissue”.
Answer: Group of cells that are similar in structure and perform same kind of function is called a tissue.
Question 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.
Question 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.
Question 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 comers due to pectin deposition.
Sclerenchyma: walls are thickened due to presence of lignin deposition.
Question 5. What are the functions of stomata?
Answer: The outermost layer of the cell is called epidermis and is very porous. These pores are called stomata. These stomata help in transpiration and exchange of gases.
Question 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.
(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.
Question 7. What is the specific function of the cardiac muscle?
Answer: (1) Cardiac muscle cells are cylindrical or branched
(2) They are involuntary muscles.
(3) They show rhythmically contraction and relaxation throughout life.
(4) Their rhythmic contraction and relaxation helps in pumping action of heart.
Question 8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and location in the body.
Answer:
Question 9. Draw a labelled diagram of neuron.
Answer:
Question 10. Name the following:
Answer: (1) Squamous epithelium (2) Tendons
(3) Phloem (4) Areolar tissue
(5) Blood (6) Nervous tissue
Question 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 tissue
(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.
Question 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.
Question 14. How does the cork act as a protective tissue?
Answer: Cork acts as a protective tissue because its cells are dead and compactly arranged without intercellular spaces. They have deposition of suberin on the walls that make them impervious to gases and water.
