Chapter 6: Tissues

Q1Written answer

Define the term ’tissue’.

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Worked solution

A tissue is defined as a cluster of cells, which are similar in structure and work together to perform a particular function.

Q2Written answer

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

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Worked solution

The xylem tissue is made up of four main elements, namely:

➢ Vessels

➢ Tracheids

➢ Xylem fibres

➢ Xylem parenchyma

Q3Written answer

How are simple tissues different from complex tissues in plants?

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The following are the differences:

Simple tissues	Complex tissues
They are made up of a single type of cell that performs only one common function	They are made up of more than one kind of a cell that coordinate to perform one particular function

Q4Written answer

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

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Worked solution

The following are the differences between different tissues based on cell wall:

Parenchyma	Collenchyma	Sclerenchyma
Cell walls are thin and made up of cellulose	Cell walls are thick at the edges due to the deposition of pectin	Cell walls are thick due to the deposition of lignin

Q5Written answer

What are the functions of the stomata?

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Stomata are the tiny pores present on the outer layer of the cells, the epidermis. Stomata bring about the exchange of gases and transpiration.

Q6Written answer

Show the difference between the three types of muscle fibres diagrammatically.

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Worked solution

There are three types of muscle fibres, they are:

1. Cardiac muscles

Present in the heart.
Involuntary in nature.
They have 1 nucleus.
The muscle fibers are branched.

NCERT Solution for Class 9 Science Chapter 6 Tissues Question No 6 - 1 Solution

2. Smooth muscles

Found in lungs and alimentary canal.
Involuntary in nature.
They have 1 nucleus.
They are spindle-shaped.

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3. Striated muscles

They are connected with bones
Voluntary in nature.
They are long and cylindrical muscle fibers.
They possess many nuclei.
Striated muscles are unbranched.

NCERT Solution for Class 9 Science Chapter 6 Tissues Question No 6 - 3 Solution

Q7Written answer

What is the specific function of the cardiac muscle?

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Worked solution

The cardiac muscles are branched and cylindrical. They are uninucleated and are involuntary in nature. The cardiac muscles bring about a rhythmic contraction and relaxation throughout one’s lifetime.

Q8Written answer

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

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Worked solution

The following are the differences between different types of muscles, based on their structure and location in the body.

Character	Striated muscles	Un-striated muscles	Cardiac muscles
Shape/Structure	Long, cylindrical, non – tapering. They are un-branched.	Long and tapering. They are un-branched.	Cylindrical and non – tapering. They are branched.
Location in body	Hands, legs and skeletal muscles	Wall of stomach, intestine, ureter and bronchi	Heart
Dark and light bands	Present	Absent	Present but less prominent

Q9Written answer

Draw a labelled diagram of a neuron.

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Worked solution

Diagram of a neuron along with the labelling is as follows:

Neurons

Q10Written answer

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.

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Worked solution

(a) Tissue that forms the inner lining of our mouth – The epithelial tissue, Squamous epithelium.

(b) Tissue that connects muscle to bone in humans – Tendon

(c) Tissue that transports food in plants – Phloem

(d) Tissue that stores fat in our body – Adipose tissue

(e) Connective tissue with a fluid matrix – Blood, it is a fluid connective tissue

(f) Tissue present in the brain – Nervous tissue

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