NCERT Class-9 Science Solutions: Chapter 6 – Tissues Part 7

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Question 40:

Write true (T) or false (F)

  1. Epithelial tissue is protective tissue in animal body.

  2. The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.

  3. Epithelial cells have a lot of intercellular spaces.

  4. Epithelial layer is permeable layer.

  5. Epithelial layer does not allow regulation of materials between body and external environment.

Answer:

  1. Epithelial tissue is protective tissue in animal body. (True)

  2. The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue. (True)

  3. Epithelial cells have a lot of intercellular spaces. (False)

  4. Epithelial layer is permeable layer. (True)

  5. Epithelial layer does not allow regulation of materials between body and external environment. (False)

Question 41:

Differentiate between voluntary and involuntary muscles. Give one example of each type.

Answer:

Voluntary muscles can be moved by conscious will when we want them to move. For example, muscles of limbs or skeletal muscles. Involuntary muscles function on their own. We cannot start or stop them from working by our desire. Examples are cardiac muscles and smooth muscles.

Image voluntary and involuntary muscles

Image Voluntary and Involuntary Muscles

Image voluntary and involuntary muscles

Question 42:

Differentiate the following activities on the basis of voluntary (V) or involuntary (IV) muscles.

  1. Jumping of frog

  2. Pumping of the heart

  3. Writing with hand

  4. Movement of chocolate in your intestine

Answer:

  1. Jumping of frog - (V)

  2. Pumping of the heart - (IV)

  3. Writing with hand - (V)

  4. Movement of chocolate in your intestine - (IV)

Question 43:

Fill in the blanks

  1. Lining of blood vessels is made up of———.

  2. Lining of small intestine is made up of ———.

  3. Lining of kidney tubules is made up of———.

  4. Epithelial cells with cilia are found in———of our body.

Answer:

  1. Lining of blood vessels is made up of squamous epithelium.

    Image squamous epithelium

    Image Squamous Epithelium

    Image squamous epithelium

  2. Lining of small intestine is made up of columnar epithelium.

    Iamge columnar epithelium.

    Iamge Columnar Epithelium.

    Iamge columnar epithelium.

  3. Lining of kidney tubules is made up of cuboidal epithelium.

    Image cuboidal epithelium

    Image Cuboidal Epithelium

    Image cuboidal epithelium

  4. Epithelial cells with cilia are found in respiratory tract of our body.

Image respiratory tract

Image Respiratory Tract

Image respiratory tract

Question 44:

Water hyacinth float on water surface. Explain.

Answer:

Water hyacinth floats in water due to presence of large air cavities in the parenchyma tissue. These specialized parenchyma tissue are called parenchyma.

Image Parenchyma

Image Parenchyma

Image Parenchyma

Question 45:

Which structure protects the plant body against the invasion of parasites?

Answer:

The dermal tissue of plants and hard cuticle covering protect the plant body from invasion of parasites and other harmful agents

The structure that protects plant from parasitic invasion is known as the cork. Cork is formed by the cork cambium in woody plants. The cork is a tough, water proof material that helps keep of parasites from invading the plant and also protects the plant from losing excess water.

Image cuticle

Image Cuticle

Image cuticle