Important Questions for CBSE Class 9 Science Chapter 6 Tissues

Science is one of the most challenging subjects as compared to other subjects. As this subject includes many complex concepts, students need to learn the concepts of Biology, Physics, and Chemistry. In addition, the students will have to understand the various important questions for class 9 science tissues, so they will get an idea of what to expect in their upcoming exams. Furthermore, it will prepare them for the Class 10 board exams. Solving Important Questions Class 9 Science Chapter 6 will boost the student’s confidence.

At Extramarks, we understand the vitality of important questions. Therefore, our subject matter experts prepare the complete list of class 9 science chapter 6 important questions. These questions are a compilation of the NCERT book, NCERT Exemplar, NCERT solutions and past years’ questions paper. Some very Important Questions Class 9 Science Chapter 6 need to be practised by the students to ensure good results in their final exams. Students are also advised to revise the complete syllabus at regular intervals  to score more marks in their examinations. 

So, while solving Important Questions, students can grasp the concept. With tissue class 9 important questions, students will be able to learn basics such as what issues are and what is their application in living organisms. In addition, the students also learn about plant and animal tissues and other details such as meristematic tissues. Furthermore, the students can also know about different types of muscles. 

To score well in the exams, students can also practise CBSE sample papers and CBSE revision notes. It is available on the Extramarks’ website. Students can register on the Extramarks’ website and access our complete set of Important Questions Class 9 Science Chapter 6. 

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CBSE Class 9 Science Chapter 6 Question Answer

Question 1. Describe the different types of epithelial tissue. 

Answer 1: 

1. Squamous Epithelium: These are flat, thin cells that are tightly packed. The cavities of the mouth and oesophagus are lined by squamous epithelial cells. This tissue protects us against injury from mechanical forces and prevents germs from entering. The stratified squamous epithelium is a compound of squamous tissues in multiple layers. These tissues can be found in the skin and the lining of our oesophagus.
2. Cuboidal epithelium: These cells are cuboidal, and they are found in the salivary glands, kidney tubules, and sweat glands. They are responsible for absorption, secretion, as well as excretion. The stratified Cuboidal Epithelium is formed when the cuboidal epithelium has been arranged in multiple layers. It can be found on the inner side of the pancreatic and salivary glands. 
3. Columnar Epithelium: It is composed of column-like and pillar-like cells. They can be found in the linings of the stomach or intestine. Its functions include secretion and absorption.
4. Filed Epithelium: When columnar epithelial tissue has cilia, they are called the ciliated epithelium. They can be found in the linings of the trachea and kidney tubules. The rhythmic movement caused by the cilia can move material in one direction.
5. Glandular Epithelium: These are modified columnar epithelial tissue. These large cells are found in the sweat glands and tear glands. They are responsible for secretion, which is their primary function.

Question 2. Which are the types of muscles found in the human body. 

Answer 2: The human body has three types of muscles, including 

1. Smooth muscle: The smooth muscle has spindle-shaped, non-striated uninucleate fibres and occurs in the walls of internal organs. It is also known as an involuntary action. 
2. Cardiac muscle: The cardiac muscle has striated, branched, and uninucleated fibres and occurs only in the heart’s walls. It is also known as an involuntary action. 
3. Skeletal muscle: The skeletal has striated, tubular, multinucleated fibres, and the skeletal muscle is attached to the skeleton. 

Question 3. What are the characteristics of cork? 

Answer 3:  

1. a) These are the characteristics of cork:

• Cork cells are dead when they reach maturity
• These cells are compactly organised
• Intercellular spaces are not present in cells.
• Suberin is a chemical substance found in cells.
• They can be several thick layers.

1. b) As the plant ages. In the cortex of the stem, a strip is made of the secondary meristem. This meristem cuts cells on the outer sides of stems to make cork.
2. c) They protect older stems and branches. They are inert to water, gases, and pathogens.

Question 4. Why are the xylem and phloem called complex tissues? 

Answer 4: The xylem and phloem are known as complex tissues because they contain multiple types of cells; the Xylem or Phloem can be called complex tissue. These cells function in a coordinated fashion, as one unit, to fulfil the different functions of the xylem or phloem. The phloem and xylem are different because the xylem conducts water between the roots and leaves, while the phloem transports food between different parts of the plant.

Question 5. Which of the following tissues have dead cells?

1. a) Epithelial tissue
2. b) Parenchyma
3. c) Sclerenchyma
4. d) Collenchyma

Answer 5: The correct option is (c) Sclerenchyma

Explanation:

Parenchyma is a living tissue with a thin cell wall, central vacuole, and dense cytoplasm. These cells are found in the soft parts of the plants, such as the pith and cortex. 

Sclerenchyma: It is a dead tissue with a thick cell wall due to lignin deposition. The sclerenchyma is generally located in the leaf veins, hard coverings of the seeds and can also be found surrounding the vascular bundle. 

Collenchyma: It is a living tissue with a thick cell wall due to lignin deposition. They are generally located in the lead veins, the hard covering of the seeds. These cells are found in the vascular bundle. 

Epithelial tissues: It is a tissue which covers or protects tissues in the animal body. Almost every organ and cavity are covered by epithelium tissue. 

Question 6. Find an incorrect statement

1. a) Parenchymatous tissues have intercellular spaces.
2. b) Collenchymatous tissues have irregular corners. 
3. c) Apical and intercalary meristems are known as permanent tissues. 
4. d) Meristematic tissues, in their early stage, lack vacuoles. 

Answer 6: The correct option is c) Apical and intercalary meristems are permanent tissues. 

Explanation: Parenchyma serves as a packing tissue in plants; therefore, they do not have intercellular spaces. Besides, collenchymatous tissues are mechanical tissues in plants, characterised by cellulose deposition at the corners of the cell. It leads to localised thickening of the cell wall. 

Apical and intercalary meristem bring primary and secondary growth and are classified under meristematic tissues. Meristematic tissues are diving units of the plants and contain dense cytoplasm and large nuclei with few or no vacuoles. 

Question 7. Which cell does not have a perforated cell wall? 

1. a) Sieve tubes 
2. b) Vessels
3. c) Tracheids 
4. d) Companion cells

Answer 7: The correct option is a) Sieve tubes

Explanations: 

Tracheids are xylem elements that are involved in the transportation of water. These are tube-like structures that can be used to conduct water. In addition, sieve tubes are thin structures with end walls punctured by many pores. They are also known as sieve plates. They are primary food conductor elements and phloem components. Companion cells contain many mitochondria and ribosomes, and they are support units for sieve tubes.

Question 8. If the intestine absorbs the digested food materials, which type of epithelial cells are responsible?

1. a) Spindle fibres 
2. b) Cuboidal epithelium
3. c) Stratified squamous epithelium 
4. d) Columnar epithelium

Answer 8: The correct option is d) Columnar epithelium

Explanation: 

The columnar epithelium has pillar-like cells with their nuclei towards the base. They form the lining of the stomach, small intestine, and colon, and it helps form the mucous membrane. The primary function is absorption (e.g., stomach and intestine) and secretion (e.g. mucus by goblet cells). 

Stratified squamous epithelium is covered by a fibrous protein covering the skin. Therefore, the epithelium is impermeable and resistant to mechanical injury. This epithelium tissue is found in kidney tubules, thyroid vesicles, and glands. 

Question 9. If a person met with an accident in which two long bones of a hand were dislocated. State the reason for the dislocation of the bone. 

1. a) Ligament break
2. b) Areolar tissue break
3. c) Tendon break
4. d) Break of skeletal muscle

Answer 9: The correct option is a) Ligament break. 

Explanation: If dislocation of the joint occurs, then there is an abnormal separation in the joint that is held together by a ligament. The ligament breaks and may result in the dislocation of bone. Areolar tissues join skin to muscles, fill spaces inside organs and are found around muscles, blood vessels, and nerves. Therefore, it is not concerned with bones. Besides, tendon break may cause inflammation due to age, body weight, nutrition, sports, etc.

Question 10. While doing work and running, you can move your organs like hands, legs, etc. So which among the following is correct?

1. a) Smooth muscles can contract and pull the ligament to move the bones. 
2. b) Smooth muscles can contract and helps to pull the tendons. 
3. c) Skeletal muscles contract and helps to pull the ligament to move the bones. 
4. d) Skeletal muscles contract and help to pull the tendon to move the bones. 

Answer 10: The correct option is d) Skeletal muscles contract and pull the tendon to move the bones.

Explanation: Skeletal muscles are voluntary muscles due to dark and light bands. They work according to our will. Therefore, they are known as voluntary. At the same time, while doing work and running, skeletal muscles contract and pull the tendon to move the bone. 

Question 11. What muscles do you act involuntarily? 

(i) Striated muscle 

(ii) Smooth muscle

(iii) Cardiac muscles 

(iv) Skeletal muscles

Options

(a) (i), (ii), 

(b) (ii), and (iii).

(c) (iii), (iv), 

(d) (i) and iv).

Answer 11: The correct option is (b) (ii), and (iii).

Explanation: 

Smooth muscles can be found within walls of hollow visceral orifices. They don’t work according to our will. In addition, smooth muscles play a role in the peristaltic movements of the male genital and gastrointestinal tract. Furthermore, the heart has cardiac muscles. They contract and relax quickly, rhythmically, and tirelessly. Both smooth and cardiac muscles work involuntarily. On the other hand, skeletal or striated muscles move according to our will and are voluntary in their actions.

Question 12. Plants have meristematic tissues.

(a) Permanent and localised 

(b) Not limited to specific regions

(c) Localised and dividing cells 

(d) Growing in volume

Answer 12: The correct option is c) Localised and dividing cells. 

Explanation:

Meristematic tissue is composed of actively dividing cells. It can be found in the growing areas of plants, such as the tips of stems and roots. Meristematic tissue cells can be round, rectangular, oval, or polygonal. They are tightly packed without intercellular space and have thin cellulose walls and dense cytoplasm. Because they are filled with sap, vacuoles in these cells are nearly absent.

Question 13. Bone matrix is rich in: 

1. a) calcium and potassium
2. b) phosphorus and potassium
3. c) fluoride and calcium
4. d) calcium and phosphorus

Answer 13: The correct option is a) calcium and phosphorus

Explanation: Bone cells are found in the complex matrix, protected by fibres and hardened by calcium and phosphorus salts. The matrix is deposited in the form of concentric layers of lamellae formed around a central Haversian canal. 

Question 14. Cartilage cannot be found in: 

1. a) nose 
2. b) ear 
3. c) kidney 
4. d) larynx

Answer 14: The correct option is c) kidney. 

Explanation: Cartilage is a specialised connective tissue which can be compact and less vascular. In addition, the cells are widely spaced, and fibres reinforce the matrix. Therefore, cartilage occurs at the joints of bones, in the nose, ear, trachea, and larynx. Further, it helps in smoothing the surface of the joints. 

Question 15. Fats are stored in which tissue of the human body:

1. a) bones
2. b) cartilage 
3. c) cuboidal epithelium 
4. d) adipose tissue

Answer 15: The correct option is d) adipose tissue.

Explanation: Adipose tissue has oval and round cells filled with fat globules scattered in the matrix. The tissue is found below the skin, between internal organs and in the yellow bone marrow. In addition, it stores fat and acts as an insulator. Cuboidal epithelium help in excretion, secretion, and absorption, whereas bones and cartilage are specialised connective tissue, providing support to the internal organs. 

Question 16. Nerve cells do not have: 

1. a) tendons
2. b) dendrites
3. c) axons
4. d) nerve endings

Answer 16: The correct option is a) tendons

Explanation: Every nerve cell and the neuron is composed of three parts: 

1. Cyton: It is the central nucleus and cytoplasm with characteristics of deeply stained particles known as nissl’s granules. 
2. Dendron: These are short processes arising from cyton and further branching into dendrites. 
3. Axon: It is a single long cylindrical process of uniform diameter which forms fine branches terminally. They receive impulses, and the axon takes impulses away from the cell body. 

Question 17. In desert plants, the rate of water loss gets reduced due to the presence of?

1. a) lignin
2. b) suberin
3. c) cuticle
4. d) stomata

Answer 17: The correct option is c) cuticle

Explanation: Cuticles are protective, hydrophobic waxy covering produced by epidermal cells of leaves. It helps to minimise water loss through transpiration and reduces pathogen entry. Besides, lignin hardens the cell wall and provides flexibility, tensile and compressional strength to the cell wall. 

Question 18. Choose the incorrect statement: 

1. a) The nature of the matrix differs according to the function of the tissue.
2. b) Fats are stored below the skin and are found between the internal organs. 
3. c) Epithelial tissues have intercellular spaces between them. 
4. d) Cells of striated muscles are multinucleated and unbranched. 

Answer 18: The correct option is a) The nature of the matrix differs according to the function of the tissue.

Explanation: Matrix differs according to their function for cartilage has calcium salts as it supports bones whereas muscles pass contractile protein for their movement function.

Question 19. Cork cells are made from waterproof water and gases by the presence of: 

1. a) cellulose 
2. b) lipids
3. c) Suberin
4. d) lignin

Answer 19: The correct option is c) suberin

Explanation: Cellulose is the basis of the cell wall present in plants. In addition, the cell walls of almost all organisms are made up of cellulose, whereas lipids, along with some proteins from the basic building blocks of plasma membranes. The plasma membrane is semi-permeable, and it is not impervious to water. 

Lignin is a complex polymer which deals with cement and hardens the cell wall. It provides the flexibility of the tremendous tensile and compressional strength to the cell wall and makes it impermeable. The work of cork cells is heavily thickened with an organic substance, suberin. It makes these cells impervious to water and gases. 

Question 20. Write True or False for the following statement: 

1. a) Epithelial tissue is very protective tissue in an animal body. 
2. b) The lining of blood vessels, lung alveoli and kidney tubules comprise epithelial tissue. 
3. c) Epithelial layer is permeable layer 
4. d) Epithelial cells have a lot of intercellular spaces
5. e) Epithelial layer does not regulate materials between body and external environment. 

Answer 20: 

1. a) Epithelial tissue is very protective tissue in the animal body: True 
2. b) The lining of blood vessels, lung alveoli and kidney tubules are made up of epithelial tissue: True 
3. c) Epithelial layer is permeable: False 
4. d) Epithelial cells have a lot of intercellular spaces: False 
5. e) Epithelial layer does not allow regulation of materials between body and external environment: True

Explanation: 

Epithelial tissue is the protective layer of cells; it covers the body’s surface and lines of the internal organs. 

It is present in the lining of blood vessels such as squamous epithelial tissue, lung alveoli and kidney tubules. 

These cells are closely packed together and regulate the movement of materials between the body and the external environment. 

Question 21. Differentiate sclerenchyma and parenchyma tissues.

Answer 21: 

Question 22. Distinguish between simple epithelial tissue and Stratified epithelial tissue. 

Answer 22: 

Question 23. Give reasons for the following statements: 

(a) Meristematic cells lack vacuole, despite having a prominent nucleus.

(b) In sclerenchymatous tissues, intercellular spaces are absent.

(c) Pear fruit gives us a crunchy, granular sensation when we chew it.

(d) Tree branches can move freely and bend in high winds.

(e) Removing the coconut tree’s husk can be challenging.

Answer 23:

(a) Meristematic Cells are the continuously dividing cells in the plant body. They also remain metabolically active. We know that vacuoles are used for storage purposes. Meristematic cells don’t require vacuole.

(b) Sclerenchyma tissues are a plant’s dead, superficial permanent tissue. Sclerenchyma cells are tightly packed, just like tiles on a mosaic floor without intercellular space. This allows the plant to withstand different strains and provides strength, rigidity, flexibility, and elasticity.

(c) Pear fruits are crunchy and granular due to sclerenchyma tissue. Due to the presence of lignin, the sclerenchyma cell walls have a thickened texture. Lignin, a complex polymer, has a high tensile force, e. It is not easily stretched, and it has high compressive strength. It does not easily buckle.

(d) Collenchyma Cells are characterised by the accumulation of extra cellulose in the corners of the cells. Collenchyma cells lack intercellular spaces and have longer cells. It is a mechanical tissue that provides support and elasticity to branches of trees so they can move and bend in high winds.

(e) Because of the presence of Sclerenchyma tissue, it is difficult to remove the shell from a coconut tree. A middle lamella is a layer between the cells of sclerenchyma tissues. It contains intercellular spaces and tightly packed cells. In addition, the middle lamella is a thin layer containing pectin and lignin.

Question 24. Fill in the blanks: 

1. a) _____ are forms of complex tissue.
2. b) ____ have guard cells. 
3. c) Cells of cork consists of a chemical known as _____
4. d) Husk of coconut is made of____
5. e) _____ gives flexibility in plants. 
6. f) ______ and _____ are both conducting tissues. 
7. g) Xylem transport _____ and _____ from soil. 
8. h) Phloem transport _____ from _____ to other parts of the plant. 

Answer 24: 

1. a) Xylem and phloem are forms of complex tissue.
2. b) Stomata have guard cells. 
3. c) Cells of cork consist of a chemical known as
4. d) Coconut Husk is made of
5. e) Collenchyma gives flexibility to plants. 
6. f) Xylem and phloem are both conducting tissues. 
7. g) Xylem transport water and minerals from the soil. 
8. h) Phloem transport food from leaves to other parts of the plant. 

Question 25. What is a tissue?

Answer 25: The tissue is a group of cells similar in origin and arrangement, specialised in performing a particular function. Tissues cluster the cells to give the highest possible efficiency of the required function. Examples of tissues are blood, phloem and muscle. 

Question 26. What is the utility of tissues in multicellular organisms?

Answer 26: 

1. Division of labour: The tissue brings about division of labour in multicellular organisms. It increases efficiency. 
2. Higher organisation: Tissues become organised to form organs and organ systems. 
3. Individual cells: The workload of individual cells decreases. 
4. Higher survival: Multicellular organisms have high survival due to the division of labour and higher efficiency. 

Question 27. Give three features of cardiac muscles. 

Answer 27: 

1. Fibres: The fibres are tiny, cylindrical, and uninucleate striated with short lateral branches. 
2. Intercalated disc: The intercalated discs function as impulse boosters. It is located in the union area between the two adjacent cardiac muscle fibres and zig-zag junctions. 
3. Rhythmic contractions: The muscles are involuntary and non-fatigued. It helps to continue to contract and relax tirelessly throughout life. 

Question 28. Name four functions of areolar tissue.

Answer 28: 

1. Areolar tissues offer packing material in various parts of organs. 
2. Areolar tissues bind various structures with one another in such a way as to prevent their dislocation while allowing macrophages limited movement. 
3. It provides covering muscles and blood vessels. 
4. The tissues provide materials for the repair of injury. 

Question 29. Explain, in short, the key difference between simple and complex issues: 

Answer 29: 

Simple Tissues 

• A superficial tissue is formed of only one type of cell. 
• All the cells perform the same function. 
• Superficial tissues have three types, including parenchyma, collenchyma, and sclerenchyma. 
• Superficial tissues form the primary structure of the plant. 

Complex Tissues

• A complex tissue is made of more than one type of cell. 
• The different cells perform different fractions of a function. 
• Complex tissues have three types, including the xylem and phloem.
• Complex tissues form the transport system of the plant. 

Question 30. Name three functions of stomata.

Answer 30: 

1. They regulate both gaseous exchange and transpiration. 
2. Transpiration removes excess water and cools plant surfaces even in the bright sun. 
3. Stomata exchange gases between the plant interior and the external environment. 

Question 31. How does the cork act as a protective tissue?

Answer 31: In the plant, a strip of secondary meristem located in the cortex forms layers of cells. The cells are dead and arranged compactly without intercellular spaces, which is cork. They have suberin deposition in their walls, which is very hard and impenetrable, protecting plants from unfavourable conditions and microbial attacks. 

Question 32. What is meristematic and permanent tissue?

Answer 32: 

• Meristematic tissues: Plants grow because dividing tissue occurs only in certain regions. This is also known as “meristematic” tissue. The meristematic tissue classifications are apical, intercalary and lateral. 
• Permanent tissue: Meristematic tissue cells eventually lose their ability to divide. Differentiation is acquiring a permanent size, shape, and function. This also leads to the formation of permanent tissues.

Question 33. Define aerenchyma and name two functions. 

Answer 33: The aerenchyma is specialised parenchyma found in aquatic plants and consists of a network of small cells enclosing large air cavities. It has a buoyancy quality which makes the aquatic plant buoyant inside and over the water’s surface. In addition, it stores metabolic gases such as O2 and CO2. 

Question 34. What are skeletal connective tissues, and mention three functions? 

Answer 34: In skeletal connective tissue, the matrix is solid, and the living cell has fluid-filled spaces called lacunae. In addition, skeletal connective tissue has two types: cartilage and bone. 

Functions:

• The tissues from the internal supporting framework of the animal body. 
• It protects vital organs like the spinal cord and heart. 
• The tissues store minerals and some of which are withdrawn by the body. 

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Science concepts can be complex for students to grasp. This can be overcome by practising Important Questions in Class 9 Science Chapter 6. The Important Questions in Class 9 Science Chapter 6 cover all the key topics. These questions are designed from an exam perspective, as they are the most likely to be asked during the exam. Solving tissue class 9 extra questions gives students a competitive edge.

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• This comprehensive guide to essential questions combines all the questions and helps students to prepare for the annual exams.
• It helps students gain a deeper understanding of concepts and prepares them for exams in a balanced way.
• This list contains the questions that correspond to each chapter of the textbook.
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• Students can choose between the different types based on their exam requirements.
• This list will cover all Important Questions in this chapter and help students to solve them.
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