NCERT Solutions for Class 9 Science Chapter 6 Tissues

Q:

Name the region in which parenchyma tissue is present.

A:

Parenchyma tissue is present in the following plant parts:

Stem, leaves, roots, flowers and vascular tissues.

Q:

Define the term “tissue”.

A:

Tissue is defined as a group of similar cells that are arranged and designed to perform a specific function

Q:

What is the specific function of the cardiac muscle?

A:

The specific function of cardiac muscle is to contract and relax rhythmically through the life and to facilitate the transportation of gases, nutrients and metabolites to various body parts through blood circulation.

Q:

How many types of elements together make up the xylem tissue? Name them.

A:

Xylem tissue is a type of complex tissue. There are four types of elements that together make up the xylem tissue. The different types of elements are:

  1. Trachieds: tubular structure
  2. Vessels: tubular structures and along with trachieds they facilitate vertical conduction of water and minerals
  3. Xylem parenchyma: stores food and facilitate sideways conduction of water.
  4. Xylem fibres: supportive in function

Q:

Complete the table:

A:

Q:

How does the cork act as a protective tissue?

A:

Cork is a several layered thick outermost protective tissue present on mature plants. The cells of cork are compactly arranged without the intercellular spaces and are dead.  A special chemical called suberin is present in the cell walls of the cork cells that make them impermeable to gases and water. Due to this, it protects plants against water loss. It also protects plants against mechanical injury and temperature extremes. It also protects plants against fungal diseases by not allowing the parasitic fungi to grow on the plants. .

Q:

Draw a lebelled diagram of a neuron.

A:

Labelled diagram of a neuron:

Q:

Diagrammatically show the difference between the three types of muscle fibres.

A:

Q:

What are the functions of the stomata?

A:

Stomata perform the following two functions;

  1. They allow the exchange of gases (oxygen and carbon dioxide) between plants and atmosphere.
  2. They facilitate the release of water vapours from the leaves and hence regulate the process of transpiration.

               

Q:

What is the role of epidermis in plants?

A:

Epidermis performs the following functions in plants:

  1. It covers the entire plant and protects all the parts of the plant.
  2. It secrets a waxy, water resistant layer on outer surface of the aerial parts of the plants and prevents water loss.
  3. It protects plants against mechanical injury and invasion of parasitic fungi.
  4. It possesses stomata that facilitate gaseous exchange between plant and the atmosphere and allows transpiration to take place.
  5. In roots, it aids in water absorption through the root hair present in root cells.        

Q:

Identify the type of tissue in the following skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

A:

Name of the organ

Type of tissue present

Skin

Stratified squamous epithelial tissue

Bark of tree

Secondary meristem (cork)

Bone

Connective tissue

Lining of kidney tubule

Cuboidal epithelial tissue

Vascular bundle

Complex tissue:  xylem and phloem

Q:

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.

A:

(a) Squamous epithelial tissue

(b) Tendon

(c) Phloem

(d) Adipose tissue

(e) Blood

(f) Nervous tissue

Q:

Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.

A:

Difference between striated, unstriated and cardiac muscles on the basis of their structure

Character

Striated muscles

Unstriated muscles

Cardiac muscles

Size and shape

Long and cylindrical

Long, narrow and spindle shaped

Short and cylindrical

Branching

Absent

Absent

present

Number nucleus present

Multinucleate

Uninucleate

Uninucleate

Position of nucleus

Peripheral

Central

Central

Striations

Present in the form of dark and light bands

Absent

Present in the form of faint bands

Edges of the cell

Blunt ends

Tapered end

Flat and wavy

Difference between striated, unstriated and cardiac muscles on the basis of their location

 

Striated muscles

Unstriated muscles

Cardiac muscles

Location

Tongue, hands, legs, etc.

Iris of the eye, ureters, bronchi, etc.

Heart

Q:

Differentiate between parenchyma, collenchymas and sclerenchyma on the basis of their cell wall.

A:

Parenchyma

Collenchyma

Sclerenchyma

Cell walls are thin.

Cell wall is irregularly thickened at the corners.

Cell wall is uniformly thickened.

Cell wall is mainly composed of cellulose.

Pectin and hemicelluloses are the main constituents of the cell wall in this tissue.

The thick cell wall scelerenchyma are impregnated with lignin.

Q:

How are simple tissues different from complex tissues in plants?

A:

Character

Simple tissues

Complex Tissues

Composition of cells

Composed of only one type of cells

Composed of different types of cells

Origin and structure of cells

Common origin and structure

Different origin and structure

Function

Storage of food and supportive in nature

Transport water, minerals, sugar and metabolites within plant body

Examples

Parenchyma, Collenchyma, Sclerenchyma

Xylem and phloem

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1. They are developed by our experts with the right approach for precisely answering the textbook questions.

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5. They will help in understanding the solutions and the methodology of writing the answers in the exams.

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Frequently Asked Questions

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