Tissues NCERT Question and Answers Class 9 Chapter 6

Here are NCERT book question and answers of Class 9 Science Chapter 6

Tissues Question and Answers.

page no 69

Q1. What is a Tissue?
Ans.A tissue is a group of cells having similar structure, performing identical function.

Q2.What is the utility of tissues in multi-cellular organisms?
Ans.In multi-cellular organisms there is division of labour.as cells become specialised to perform specific function for e.g muscle cells are specialised  for contraction and relaxation to cause movements.



page no 74.

Q1.Name types of simple tissue?
Ans. Simple tissues are those which have only one types of cells for e.g Parenchyma,Collenchyma and Sclerenchyma

Q2.Where is apical meristem found?
Ans.It is found at the tip of root and shoot, it helps in the growth of length of plant

Q3. Which type of tissue make up husk of coconut.

Ans. Scelrenchyma

Q4.What are the constituents of phloem
Ans. Phloem is a complex permanent tissue, it has more than one type of cells like
Sieve tubes,companion cells,Phloem parenchyma and phloem fibres

Page no 78

Q1.Name the type of tissue responsible for movement in our body?
 Ans.Muscle tissues contract and relax to cause motion

Q2.What does neuron looks like?
Ans.A neuron consists of a cell body with a nucleus and cytoplasm from which long thin hair like parts arise. usually each neuron ahs a single long part called axon and many short branched parts called dendrites.

Q3.Give three features of cardiac muscles

Ans.Cardiac muscles are present in heart

1. They are cylindrical, branched and uninucleate
2. They have indistinct striations
3. They are immune to fatigue

Q4.What are the functions of Areolar Tissue?
Ans. It is the most widely distributed in the body

• It has jelly like matrix with white and yellow fibres
• cells are loosely scattered in the matrix
• It serves as packing and supporting tissue between organs;present  between skin and muscles, around blood vessels and nerves, in the bone marrow
• It also helps in repair of tissues

Main Exercise
Q1. Define the term tissue
Ans.Group of specialised cells which perform specific function form a tissue

Q2.How many elements together make up the xylem tissue
Ans.Xylem has four components
Tracheids ,Vessels, Xylem parenchyma Xylem fibres

Q3.How are simple tissues different from complex tissues in plants

Ans.Simple tissues are made up of only one kind of cells where as complex tissues are made up of more than one kind of cells.

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

Ans.

Parenchyma	Collenchyma	Sclerenchyma
1.Thin walled	1.Thick walled at corners	1.Thick walled
2.It is made up of cellulose	2.It has deposition of pectin at corners	2.It has uniform thickening due to presence of lignin

Q5.What are the function of Stomata
Ans.Stomata helps in exchange of gases and loss of water through transpiration.Stomata are enclosed by kidney shaped cells called guard which enable opening and closing of stomata in order to lose water or exchange carbon dioxide or oxygen

 Q6.Diagramatically show difference between three types of muscle cells
 Ans.

Q7.What is the specific function of cardiac muscle 
ans.Coordinated contractions of cardiac muscle cells in the heart pump blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems.

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

Ans.

Stirated Muscle	Unstirated Muscle	Cardiac Muscle
1.The muscles cells are clyindrical unbranched and multinucleate	The muscle cells are spindle shaped and uninucleate	the muscle cells are cylindrical branched and uninucleate
2.These are voluntary muscles	These are involuntary muscles	These are involuntary Muscle
3.They get tired sustained working	They do not get fatigued	They do not get fatigued throughout life
4.Striations are distinct as light and dark bands	Striations are absent	Striations are present but are not very distinct
5.For e.g Biceps and triceps	alimantary canal	heart Muscle

Q9.Draw a lablelled diagram of neuron 
Ans.See above

Q10.Name the following
a.Tissues that form the inner lining of our mouth:
Stratified epithelium
b.Tissues that connects muscles to bone in humans
Tendons
c.Tissues that transport food in plants
Phloem
d.Tissues that stores fat in our body
Adipose
e. Connective tissue with fluid matrix
Blood
f.Tissue present in our brain
Nervous Tissue

Q11.Identify the type of tissue in the following
Skin: squamous epithelium
Bark: Epidermis
Bone:Connective tissue
lining of kidney tubule: Cuboidal epithlium
Vascular bundle Phloem and xylem

Q12.Name the regions in which parenchyma tissue is present
Ans.Parenchymatous tissue is present in the epidermis, cortex, pith of the stem, root, leaves, flowers and fruits of plants.

Q13.What is the role of epidermis in plants
Ans. It is a protective layer to the plant parts. I t can also absorb water from soil like in the roots and even allow exchange of gases through stomata.

Q14.How does cork act as protective tissue?

Ans.In plants the secondary meristem cuts off many external layers of cells that are dead and arranged in a compact manner. Such layers toget her make cork. They have deposition of suberin which is very hard and imperm eable hence protects plants from unfavourable conditions and microbial attack etc.