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Tissue

NCERT SOLUTIONS

Exercises

Question – 1 - Define the term “tissue”.

Answer:- A group of cells which is meant to perform a specific function is called tissue.

Question – 2 - How many types of elements together make up the xylem tissue? Name them.

Answer:- Xylem is composed of these elements: tracheids, xylem vessel, xylem parenchyma and xylem fibre.

Question – 3 - How are simple tissues different from complex tissues in plants?

Answer: Simple tissues are composed of similar cells, while complex tissues are composed of different types of cells.

Question – 4 - Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.

Answer:-

ParenchymaCollenchymaSclerenchyma
Cell wall is thin.Cells wall is thickened at corners.Cell wall is thickened all around.

Question – 5 - What are the functions of the stomata?

Answer: Functions of stomata are as follows:

  1. Exchange of gases
  2. Transpiration

Question – 6 - Diagrammatically show the difference between the three types of muscle fibres.

Answer

Tissue - NCERT Solutions, Class 9 (IX) Science   Tissue - NCERT Solutions, Class 9 (IX) Science   Tissue - NCERT Solutions, Class 9 (IX) Science

Question – 7 - What is the specific function of the cardiac muscle?

Answer: Cardiac muscles facilitate contraction and relaxation of heart; which results in pumping action of the heart.

Question – 8 - Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.

Answer:

Striated MusclesUnstriated MusclesCardiac Muscles
Unbranched fibres; with striations.Unbranched fibres; with striations.Branched fibres with striations.
Present in voluntary organs.Present in involuntary organs.Present in the heart.

Question – 9 - Draw a labelled diagram of a neuron.

Answer

Tissue - NCERT Solutions, Class 9 (IX) Science

Question – 10 - Name the following.

Answer: Simple epithelium

Answer: Tendon

Answer: Phloem

Answer: Adipose tissue

Answer: Blood

  1. Tissue that forms the inner lining of our mouth.
  2. Tissue that connects muscle to bone in humans.
  3. Tissue that transports food in plants.
  4. Tissue that stores fat in our body.
  5. Connective tissue with a fluid matrix.
  6. Tissue present in the brain.

Answer: Nervous tissue

Question – 11 - Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

Answer: Skin: Epithelium, Bark of tree: Epidermis, Bone: Connective tissue, Lining of kidney tubule: Cuboidal Epithelium, Vascular bundle: Complex plant tissue

Question – 12 - Name the regions in which parenchyma tissue is present.

Answer: Parenchyma is present in mesophyll of leaves, fruits, flowers and young stem.

Question – 13 - What is the role of epidermis in plants?

Answer: Epidermis in plants provides protective covering to the underlying tissues. In xerophytes, epidermis has a waxy coating which prevents water loss.

Question – 14 - How does the cork act as a protective tissue?

Answer: Cork forms an impervious layer over underlying tissues. Cork prevents entry of water to the underlying tissue.

Question – 15 - Complete the table:

Tissue - NCERT Solutions, Class 9 (IX) Science

Answer:

Tissue - NCERT Solutions, Class 9 (IX) Science

In Text Questions

Question – 1 - What is a tissue?

Answer: A group of cells which is meant to serve a special function is called tissue.

Question – 2 - What is the utility of tissues in multicellular organisms?

Answer: Tissues facilitate division of labour. Different tissues are responsible for different functions, which is important for the functioning of a multicellular organism.

Question – 3 - Name types of simple tissues.

Answer: Simple tissues are as follows:

  1. Parenchyma
  2. Collenchyma
  3. Sclerenchyma

Question – 4 - Where is apical meristem found?

Answer: Apical meristem is found at root apex, shoot apex, leaf buds, etc.

Question – 5 - Which tissue makes up the husk of coconut?

Answer: Sclerenchyma

Question – 6 - What are the constituents of phloem?

Answer: Phloem is composed of sieve tubes, companion cells, phloem fibres and phloem parenchyma.

Question – 7 - Name the tissue responsible for movement in our body.

Answer: Muscular tissue

Question – 8 - What does a neuron look like?

Answer: Neuron looks like a star-shaped cell with a tail.

Question – 9 - Give three features of cardiac muscle.

Answer: Three features of cardiac muscle are as follows:

  1. Cells are branched fibres.
  2. Striations are present on cells.
  3. Cells are capable of continuous contraction and relaxation.
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FAQs on Tissue - NCERT Solutions, Class 9 (IX) Science

1. What is the definition of tissue in biology?
Ans. Tissue in biology refers to a group of cells that are similar in structure and function. They work together to perform a specific function in an organism.
2. How many types of tissues are there in animals?
Ans. There are four main types of tissues in animals: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. Each type has its own unique characteristics and functions.
3. What is the role of epithelial tissue in the body?
Ans. Epithelial tissue covers the surfaces of organs, lines body cavities, and forms glands. Its main functions include protection, absorption, secretion, and sensory reception.
4. What are the different types of plant tissues?
Ans. In plants, there are three main types of tissues: meristematic tissue, permanent tissue, and protective tissue. Meristematic tissue is responsible for growth, permanent tissue carries out various functions, and protective tissue provides protection to the plant.
5. How do tissues work together to maintain homeostasis in organisms?
Ans. Tissues work together in a coordinated manner to maintain homeostasis in organisms. For example, muscle tissue contracts and relaxes to facilitate movement, nervous tissue sends signals to regulate body functions, and connective tissue provides support and connects different body parts. Overall, the collaboration between different tissues ensures the proper functioning of the body and its internal environment.
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