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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:-

Parenchyma
Collenchyma
Sclerenchyma
Cell wall is thin.
Cell wall is thickened at corner.
Cell wall is thick.

Question – 5 - What are the functions of the stomata?
Answer: Functions of stomata are as follows:
Exchange of gases
Transpiration

Question – 6 - Diagrammatically show the difference between the three types of muscle fibres.
Answer
Muscle Tissue1 Muscle Tissue2 Muscle Tissue3

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 Muscles
Unstriated Muscles
Cardiac Muscles
Unbranched fibres; with striation.
Unbranched fibre; with striation.
Branched fibres with striation.
Presents in voluntary organs.
Presents in involuntary organs.
Present in heart.

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

Question – 10 - Name the following.
Tissue that forms the inner lining of our mouth.
Answer: Simple epithelium
Tissue that connects muscle to bone in humans.
Answer: Tendon
Tissue that transports food in plants.
Answer: Phloem
Tissue that stores fat in our body.
Answer: Adipose tissue
Connective tissue with a fluid matrix.
Answer: Blood
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:
tissue1

Answer:
tissue2

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:
Parenchyma
Collenchyma
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:
Cells are branched fibres.
Striations are present on cells.
Cells are capable of continuous contraction and relaxation.

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