Ncert Solutions for Class 9 Science Chapter 6: Tissues class 9 questions and answers
| Textbook | Ncert |
| Class | Class 9 |
| Subject | Science |
| Chapter | Chapter 6 |
| Chapter Name | Tissues class 9 ncert solutions |
| Category | Ncert Solutions |
| Medium | English |
Are you looking for Class 9 Science Chapter 6 question answer ? Now you can download tissues class 9 questions and answers pdf from here.
In Text Questions Page No: 61
Question 1: What is a tissue?
Answer 1: A tissue is a group of similar cells that work together to perform a specific function in the body.
Question 2: What is the utility of tissues in multi-cellular organisms?
Answer 2: Tissues provide structural strength, mechanical strength, show division of labour.
In Text Questions Page No: 65
Question 1: Name types of simple tissues.
Answer 1: The types of simple tissues are as follows:
- Parenchyma
- Collenchyma
- Sclerenchyma
Question 2: Where is apical meristem found?
Answer 2: Apical meristem is present at the growing tips of stems and roots.
Question 3: Which tissue makes up the husk of coconut?
Answer 3: Sclerenchyma tissue makes up the husk of coconut.
Question 4: What are the constituents of phloem?
Answer 4: The food-conducting tissue of plants is termed as phloem. Sieve tubes, Companion cells, Phloem parenchyma, and Phloem fibers are the four components.
In Text Questions Page No: 69
Question 1: Name the tissue responsible for movement in our body.
Answer 1: The tissue responsible for movement in our body is muscular tissue.
Question 2: What does a neuron look like?
Answer 2: A neuron consists of cell body called the cyton with hair-like parts called dendrites and a long axon.
Question 3: Give three features of cardiac muscles.
Answer 3: Three features of cardiac muscles are:
- They control the contraction and relaxation of the heart.
- Cardiac muscles are involuntary muscles that contract rapidly but do not get fatigued.
- The cells of cardiac muscles are cylindrical, branched, and uninucleate.
Question 4: What are the functions of areolar tissue?
Answer 4: Functions of areolar tissue:
- It fills the empty space inside the organs.
- It helps in supporting internal organs.
- It helps in repairing the tissues of the skin and muscles.
Exercises
Question 1: Define the term “tissue”.
Answer 1: A tissue is a group of similar cells that work together to perform a specific function in an organism.
Question 2: How many types of elements together make up the xylem tissue? Name them.
Answer 2: 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 3:
| Simple tissue | Complex tissue |
| These tissues consist of only one type of cells. | These tissues are made up of more than one type of cells. |
| The cells are more or less similar in structure and perform similar functions. | Different types of cells perform different functions. For example, in the xylem tissue, tracheids help in water transport, whereas parenchyma stores food. |
| Three types of simple tissues in plants are parenchyma, collenchyma, and sclerenchyma. | Two types of complex permanent tissues in plants are xylem and phloem. |
Question 4: Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Answer 4: difference between parenchyma, collenchyma, and sclerenchyma based on their cell wall:
| Tissue Type | Cell Wall Characteristics |
|---|---|
| Parenchyma | Thin and made of cellulose |
| Collenchyma | Unevenly thickened at corners, mainly made of cellulose and pectin |
| Sclerenchyma | Thick and lignified (contains lignin), making it very hard |
Question 5: What are the functions of the stomata?
Answer 5: Stomata are the tiny pores present on the outer layer of the cells, the epidermis. Stomata bring about the exchange of gases and transpiration.
Question 6: Diagrammatically show the difference between the three types of muscle fibres.
Answer 6:
Striated Muscle (Skeletal Muscle)
- Long, cylindrical
- Multinucleated
- Striations (bands) present
Smooth Muscle
- Spindle-shaped (tapered ends)
- Single nucleus
- No striations
Cardiac Muscle
- Branched
- Single nucleus per cell
- Faint striations
- Intercalated discs (connecting branches)
Question 7: What is the specific function of the cardiac muscle?
Answer 7: Cardiac muscles undergo rhythmic contraction and relaxation throughout life. They are responsible for the heart beat and thus, plays a central role in the circulation (pumping) of blood in the body.
Question 8: Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Answer 8:
| Striated muscle | Unstriated muscle | Unstriated muscle | |
|---|---|---|---|
| Based on structure: | Cells are cylindrical. | Cells are long. | Cells are cylindrical. |
| Cells are not branched. | Cells are not branched. | Cells are branched. | |
| Cells are multinucleated. | Cells are uninucleated. | Cells are uninucleated. | |
| Alternate light and dark bands are present. | There are no bands present. | Faint bands are present. | |
| Its ends are blunt. | Its ends are tapering. | Its ends are flat and wavy. | |
| Based on location: | These muscles are present in 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, and other functions. | These muscles control the contraction and relaxation of the heart. |
Question 9: Draw a labelled diagram of a neuron.
Answer 9:
Question 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 10:
(a) Epithelial tissue
(b) Tendon
(c) Phloem
(d) Adipose tissue
(e) Blood
(f) Nervous tissue
Question 11: . Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Answer 11: Here are the types of tissues found in each:
- Skin – Epithelial tissue
- Bark of tree – Protective tissue (Cork)
- Bone – Connective tissue
- Lining of kidney tubule – Cuboidal epithelial tissue
- Vascular bundle – Conducting tissue (Xylem and Phloem)
Question 12: Name the regions in which parenchyma tissue is present.
Answer 12: Parenchyma tissue is present in the following regions:
- Cortex and pith of stems and roots
- Mesophyll of leaves (for photosynthesis)
- Flesh of fruits
- Seeds (for storage)
- Xylem and phloem (as xylem and phloem parenchyma)
Question 13: What is the role of epidermis in plants?
Answer 13: The epidermis in plants forms an uninterrupted and continuous layer that has no intercellular spaces. It provides protection.
Question 14: How does the cork act as a protective tissue?
Answer 14: 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.
Question 15: Complete the following chart:
Answer 15: The completed chart is as follows:
