Chapter - 6, Tissues NCERT Solution

Page – 69

Q1 – What is tissue ?

Ans – Tissue is a group of cells that are similar in structure and act together to perform a specific function.

Q2 – What is the utility of tissues in multi-cellular organisms ?

Ans – There is division of labour in multi-cellular organisms. Eg, muscular tissue helps in movement, nervous tissue helps in transmission of messages.

Page – 74

Q1 – Name types of simple tissues.

Ans - Simple permanent tissues are of three types : -

(i) Parenchyma

(ii) Collenchyma

(iii) Sclerenchyma

Q2 – Where is apical meristem found ?

Ans – Apical meristem is found at the growing tips of the stem and roots.

Q3 – Which tissue makes up the husk of coconut ?

Ans – The husk of coconut is made up of sclerenchyma tissue.

Q4 – What are the constituents of phloem ?

Ans – Phloem constituents of four types of cells

(i) Sieve tubes

(ii) Companion cells

(iii) Phloem parenchyma

(iv) Phloem fibres

Page – 78

Q1 – Name the tissue responsible for movement in our body.

Ans – Muscular tissue is responsible for movement in our body.

Q2 – What does the neuron look like ?

Ans – A neuron consist of a cell body with a nucleus and cytoplasm. It has two extensions the axon and dendrites.

Q3 – Give three features of cardiac muscles.

Ans – Three features of cardiac muscles are as follows :

(i) These are involuntary, work rapidly throughout life.

(ii) The cells of these muscles are cylindrical, branched and

uninucleate.

(iii) These muscles are formed walls of heart.

Q4 – What are the functions of areolar tissue ?

Ans – Functions of areolar tissue are :

(i) It support internal organs

(ii) It fill space between the muscles and skin.

Page – 79 EXERCISE

Q1 – Define the term ‘’Tissue’’.

Ans – Tissue is a group of cells that are similar in structure and act together to perform a specific function.

Q2 – How many types of elements together make up the xylem tissue ? Name them.

Ans – Xylem contain four types of cells :-

(i) Tracheids

(ii) Vessels

(iii) Xylem fibres

(iv) Xylem parenchyma

Q3 – How are simple tissues different from complex tissues in plants?
Ans -

Simple tissue	Complex tissue
This tissue is made up of single type of cell	This tissue is made up of more than one type of cell
The cells of this tissue are similar in structure	The cells of this tissue are not similar in structure
Simple tissue are further classified in three types (i) Parenchyma (ii) Collenchyma (iii) Sclerenchyma	Complex tissue are further classified in two types (i) Xylem (ii) Phloem

Q4 – Differentiate between parenchyma, collenchyma and sclerenchyma, on the basis of their cell wall.

Ans -

Parenchyma	Collenchyma	Sclerenchyma
Parenchyma have thin cell wall, oval or spherical in shape	Collenchyma have irregularly thick at the corners	Sclerenchyma have thick cell wall
Cells are loosely packed	Very little space between the cells	No space between the cells
Cell wall made up of cellulose	Cell wall made up of hemi cellulose	Cell wall made up of Lignin

Q5 – What are the functions of stomata ?

Ans – Stomata allow gaseous exchange oxygen and carbon dioxide with the atmosphere. It also help in the process of transpiration.

Q6 – Digrammatically show the difference between the three types of muscles fibres.

Ans –

Q7 – What is the specific function of the cardiac muscle ?

Ans – The specific function of the cardiac muscle is to control the contraction and relaxation of heart throughout life without get tired.

Q8 – Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.

Ans –

Difference on the basis of structure :
Striated Muscles	Unstraited Muscles	Cardiac muscle
Cylindrical cells	Long cells	Cylindrical cells
Multinucleate cells	Uninucleate cells	Uninucleate cells
Light and dark bands present	Bands are absent	Faint bands are present
Difference on the basis of location :
These muscles are present in parts of body as legs, hands etc	These muscles are found in the wall of stomach, intestine urinary bladder, iris of eye etc	These muscles are present in the wall of heart

Q9 – Draw a labelled diagram of a neuron.

Ans –

Q10 – Name the following :

(i) Tissue that forms the inner lining of our mouth.

(ii) Tissue that connects muscle to bone in humans.

(iii) Tissue that transports food in plants.

(iv) Tissue that stores fat in our body.

(v) Connective tissue with a fluid matrix.

(vi) Tissue present in the brain.

Ans –

(i) Epithelial tissue form the inner lining of out mouth.

(ii) Tendons connects muscles to bone in humans.

(iii) Phloem tissue transports food in plants.

(iv) Adipose tissue stores fat in our body.

(v) Blood is the connective tissue with fluid matrix.

(vi) Nervous tissue present in the brain.

Q11 – Identify the type of tissue in the following :

Skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

Ans – Skin - Stratified squamous epithelial tissue

Bark of tree – Simple permanent tissue

Bone – Connective tissue

Lining of kidney tubule – Cuboidal epithelial tissue

Vascular bundle – Complex permanent tissue

Q12 – Name the regions in which parenchyma tissue is present.

Ans – Parenchyma tissue present in the following parts of plant:

Leaves, fruits and flowers.

Q13 – What is the role of epidermis in plants ?

Ans – Epidermis tissue form an outer layer of the plant body without any intercellular space. It perform following functions in plants :

a) It protects the plant form mechanical injury.

b) It allows exchange of gases through stomata.

c) It also helps in transpiration of water through stomata.

Q14 – How does the cork act as a protective tissue ?

Ans – The cork is made up of dead cells. It is the outer layer of bark of trees. Therefore, it protects the plant from desiccation, infection and mechanical injury. It also works as shock absorber and insulator.

Q15 – Complete the table: