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Q1 What is a tissue?
Ans: A group of cells that are comparable in design and work together to do an impossible to miss work is called tissue.
Q2 What is the utility of tissues in multi-cellular organisms?
Ans: Tissues give underlying strength, mechanical strength, show division of work.
Chapter 6 Tissues
A group of cell that perform similar function are tissue. In a organism how a very minute cell control and coordinate to perform similar function is all about the origin of living organism. Plants and animals are made of different tissue thats why plant are hard to touch but animals are soft. Let's read more of different types of tissues how they organise to form different organs.
Download pdf of NCERT Solutions for Class Science Chapter 6 Tissues
Download pdf of NCERT Examplar with Solutions for Class Science Chapter 6 Tissues
Exercise 1
Exercise 2
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Q1 Name types of simple tissues.
Ans: The types of simple tissues are Parenchyma, Collenchyma, Sclerenchyma and Aerenchyma.
Q2 Where is apical meristem found?
Ans: Apical meristem is found at the tip of the root of the plant.
Q3 Which tissue makes up the husk of coconut?
Ans: The husk of coconut is made of sclerenchymatous tissue.
Q4 What are the constituents of phloem?
Ans: Phloem consists of four kinds of components: strainer tube, partner cells, phloem filaments and phloem parenchyma.
Exercise 3
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Q1 Name the tissue responsible for movement in our body.
Ans: 1. Muscular tissue, 2. Nervous tissue, a mix of both tissues are important for development in our body.
Q2 What does a neuron look like?
Ans: A neuron comprises a cell body with a nucleus and cytoplasm, from which long thin hair-like parts emerge. Every neuron has a solitary long part called the axon, and some little, short expanded parts called dendrite. An individual nerve cell is known as a neuron, it very well might be up to a meter long.
Q3 Give three features of cardiac muscles.
Ans: Features of cardiac muscles
(1) Heart muscles (cardiovascular muscles) are round and hollow, stretched and uninucleated.
(2) They are striated muscle fibres.
(3) They are compulsory muscles, and can't be constrained by us.Q4 What are the functions of areolar tissue?
Ans: Areolar tissues are connective tissues found in animals. It is found among skin and muscles, around veins and nerves and in the bone marrow.
It occupies the space inside the organs, upholds inner organs and helps in the maintenance of tissues.
Exercise 4
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Q1 Define the term “tissue”.
Ans: A group of cells that are comparable in design and work together to do an impossible to miss work is called tissue.
Q2 How many types of elements together make up the xylem tissue? Name them.
Ans: The xylem is composed of vessels, tracheids, xylem fibres and xylem parenchyma.
Q3 How are simple tissues different from complex tissues in plants?
Ans: Simple tissues are composed of one kind of cells which facilitate playing out a typical capacity.
Complex tissues are composed of more than one sort of cell. Every one of these arranges to play out a typical capacity.Q4 Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Ans: Parenchyma: The cells have slight cell dividers composed of cellulose.
Collenchyma: The cells have cell dividers thickened at the comers because of the gelatin statement.
Sclerenchyma: Their dividers are thickened because of lignin testimony.Q5 What are the functions of the stomata?
Ans: Stomata is a mouth-like opening in the leaf surface it helps in evacuation of excess water and helps in admission of oxygen structure to the external climate which helps in photosynthesis. It opens when there is need to eliminate water or to take oxygen and yet monitor cells shuts the sonar when there Is no need of product and oxygen.
Q6 Diagrammatically show the difference between the three types of muscle fibres.
Ans: Three type of muscle fibres: Striated muscles, Smooth muscles, Cardiac muscles
Q7 What is the specific function of the cardiac muscle?
Ans: (1) Cardiac muscles cells are round and hollow, fanned and uninucleated.
(2) They are compulsory muscles.
(3) They show musical withdrawal and unwinding all through life.
(4) Their musical withdrawal and unwinding helps in siphoning the heart.Q8 Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Ans: Striated muscles Unstriated muscles Cardiac muscles 1. The cells of striated muscles are long, cylindrical, unbranched and multinucleate. 1. The cells of unstriated muscles are long and pointed at the ends, spindle shaped and uninucleate. 1. The cells of cardiac muscles are cylindrical, branched and uninucleate. 2. Many nuclei which are situated towards the periphery of muscle fibre. 2. The cells have only one nucleus situated in the center. 2. Each cell contains one or two nuclei situated in the center. Q9 Draw a labelled diagram of a neuron.
Ans:
Q10 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.Ans: (a) Squamous epithelium
(b) Tendons
(c) Phloem
(d) Areolar tissue
(e) Blood
(f) Nervous tissueQ11 Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Ans: (a) Skin—Stratified squamous epithelium
(b) Bark of tree—Cork, protective tissue
(c) Bone—Connective tissue
(d) Lining of kidney tubule—Cuboidal epithelium tissue
(e) Vascular bundle—Conducting tissueQ12 Name the regions in which parenchyma tissue is present.
Ans: In the essence of the roots and stems. At the point when it contains chlorophyll, it is called chlorenchyma, found in green leaves. In aquatic plants, parenchyma contains enormous air cavities and assists them with drifting. This kind of parenchyma is called aerenchyma.
Q13 What is the role of epidermis in plants?
Ans: Cells of epidermis structure a constant layer without intercellular spaces. It secures every one of the pieces of plants.
Q14 How does the cork act as a protective tissue?
Ans: Cork goes about as a defensive tissue since its cells are dead and minimalistically orchestrated without intercellular spaces. They have testimony of suberin on the dividers that make them impenetrable to gases and water.
Q15 Complete the table:
Ans:
Popular Questions of Class 9 Science
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Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 40 km h-1. What is the average speed for Abdul’s trip?
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Fig 8.11 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:
Fig. 8.11
(a) Which of the three is travelling the fastest?
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(c) How far has C travelled when B passes A?
(d) How far has B travelled by the time it passes C? - Q:-
The speed-time graph for a car is shown is Fig. 8.12.
Fig. 8.12
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Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions
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