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Tag: Chapter 6: Tissues Class 9th Science NCERT solutions

  • Class 9th Science Chapter-6 Exercises

    Exercises – Chapter 6: Tissues

    Question 1

    Define the term “tissue”.

    Answer:
    A tissue is a group of similar cells having a common origin that work together to perform a specific function.

    Question 2

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

    Answer:
    Xylem tissue is made up of four types of elements:

    1. Tracheids

    2. Vessels

    3. Xylem fibres

    4. Xylem parenchyma

    Question 3

    How are simple tissues different from complex tissues in plants?

    Answer:

    Simple Tissues Complex Tissues
    Made of one type of cell Made of more than one type of cell
    Perform basic functions

    Perform complex functions like transport

    Example: Parenchyma, Collenchyma, Sclerenchyma

    		 Example: Xylem, Phloem

    Question 4

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

    Answer:

    Tissue Cell wall
    Parenchyma Thin cell wall
    Collenchyma

    Unevenly thickened at corners
    Sclerenchyma Very thick, lignified cell wall

    Question 5

    What are the functions of the stomata?

    Answer:
    Functions of stomata:

    1. Exchange of gases (O₂ and CO₂)

    2. Transpiration (loss of water vapour)

    3. Regulation of water balance in plants

    Question 6

    Diagrammatically show the difference between the three types of muscle fibres.

    Answer (what to draw in exam):

    • Striated muscle:
      Long, cylindrical fibres with alternate light and dark bands, many nuclei.

    • Unstriated muscle:
      Spindle-shaped fibres, no striations, single nucleus.

    • Cardiac muscle:
      Branched fibres with striations, single nucleus, connected by intercalated discs.

    Question 7

    What is the specific function of the cardiac muscle?

    Answer:
    The cardiac muscle contracts rhythmically and continuously to pump blood throughout the body.

    Question 8

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

    Answer:

    Feature Striated Unstriated Cardiac
    Striations Present Absent Present
    Control Voluntary

    Involuntary

    		 Involuntary
    Shape

    Long, cylindrical

    		 Spindle-shaped Branched
    Location Limbs

    Stomach, intestine

    		 Heart

    Question 9

    Draw a labelled diagram of a neuron.

    Answer (what to draw):

    • Dendrites

    • Cell body (cyton)

    • Nucleus

    • Axon

    • Axon terminal

    (Draw a neat neuron and label all parts clearly.)

    Question 10

    Name the following:

    (a) Tissue that forms the inner lining of our mouth
    → 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

    (f) Tissue present in the brain
    → Nervous tissue

    Question 11

    Identify the type of tissue in the following:

    Structure Tissue
    Skin Squamous epithelium
    Bark of tree

    Protective tissue
    Bone

    Connective tissue
    Lining of kidney tubule

    Cuboidal epithelium
    Vascular bundle

    Complex permanent tissue

    Question 12

    Name the regions in which parenchyma tissue is present.

    Answer:
    Parenchyma tissue is present in:

    • Cortex and pith of stems and roots

    • Mesophyll of leaves

    • Fleshy parts of fruits

    • Seeds and endosperm

    Question 13

    What is the role of epidermis in plants?

    Answer:
    The epidermis forms the outer protective layer of plants. Its main roles are:

    • Protection from mechanical injury and infection

    • Prevention of water loss by cuticle

    • Gas exchange through stomata

    • Absorption of water and minerals in roots (root hairs)

    Question 14

    How does the cork act as a protective tissue?

    Answer:
    Cork acts as a protective tissue because:

    • Its cells are dead and tightly packed

    • Cell walls are coated with suberin, which makes them impermeable to water and gases

    • It protects the plant from water loss, pathogens, and mechanical damage

    Question 15

    Complete the following chart:

    Tissue Location Function
    Areolar tissue Between skin and muscles

     

    Packing, binding and support
    Adipose tissue Below skin, around organs Storage of fat, insulation
    Bone Skeleton

     

    Support, protection, movement
    Tendon Between muscle and bone Attaches muscle to bone
    Blood Blood vessels

     

    Transport of gases, food, wastes

     

     

  • Science 9th Science Chapter-6 In-Text Questions

    Chapter 6: Tissues

    In-Text Questions & Answers

    Page No. 61 

    Question 1:

    What is a tissue?

    Answer:
    A tissue is a group of cells that are similar in structure and work together to perform a specific function.
    Examples: Blood, muscle, phloem.

    Question 2:

    What is the utility of tissues in multicellular organisms?

    Answer:
    Tissues are useful in multicellular organisms because:

    • They bring about division of labour, where different tissues perform different functions.

    • This increases efficiency of work.

    • Tissues help in the organisation of cells, forming organs and organ systems.

    • They allow complex organisms to perform many functions simultaneously.

    Thus, tissues make the body more organised and efficient.

    Page No. 65 – Chapter 6: Tissues

    Question 1:

    Name the three types of simple permanent tissues.

    Answer:
    The three types of simple permanent tissues are:

    1. Parenchyma

    2. Collenchyma

    3. Sclerenchyma

    Question 2:

    Describe the characteristics and functions of parenchyma.

    Answer:
    Characteristics:

    • Cells are living

    • Thin cell walls

    • Large intercellular spaces

    • Usually oval or round in shape

    Functions:

    • Storage of food and water

    • Photosynthesis (when chlorophyll is present, called chlorenchyma)

    • Provides support to plants by turgidity

    Question 3:

    Describe the characteristics and functions of collenchyma.

    Answer:
    Characteristics:

    • Cells are living

    • Cell walls are unevenly thickened at the corners

    • Very little intercellular space

    Functions:

    • Provides flexibility to plant parts

    • Provides mechanical support to stems and leaves

    Question 4:

    Describe the characteristics and functions of sclerenchyma.

    Answer:
    Characteristics:

    • Cells are dead

    • Cell walls are very thick and lignified

    • No intercellular spaces

    Functions:

    • Provides strength and rigidity to plants

    • Forms hard coverings like nut shells and coconut husk

    Page No. 69 – Chapter 6: Tissues

    Question 1:

    Name the different types of animal tissues.

    Answer:
    The four main types of animal tissues are:

    1. Epithelial tissue

    2. Connective tissue

    3. Muscular tissue

    4. Nervous tissue

    Question 2:

    What is epithelial tissue? Mention its functions.

    Answer:
    Epithelial tissue is a tissue that covers the body surface, lines the internal organs and cavities, and forms glands.

    Functions:

    • Protection of underlying tissues

    • Absorption (e.g., intestine)

    • Secretion (e.g., glands)

    • Excretion and diffusion

    Question 3:

    Name the different types of epithelial tissue.

    Answer:
    The different types of epithelial tissue are:

    1. Squamous epithelium

    2. Cuboidal epithelium

    3. Columnar epithelium

    4. Ciliated epithelium

    5. Glandular epithelium

    Question 4:

    Describe squamous epithelium with its function.

    Answer:
    Squamous epithelium consists of thin, flat cells arranged like tiles on a floor.

    Function:
    It allows easy diffusion and filtration of substances.

    Example:
    Lining of blood vessels and air sacs of lungs.

    Question 5:

    Describe cuboidal epithelium with its function.

    Answer:
    Cuboidal epithelium is made of cube-shaped cells.

    Function:
    It helps in secretion and absorption.

    Example:
    Lining of kidney tubules and glands.