TISSUE

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.	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:

a.   Exchange of gases

b.   Transpiration

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

Answer

      

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 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

Question – 10 - Name the following.

a.   Tissue that forms the inner lining of our mouth.

Answer: Simple epithelium

b.   Tissue that connects muscle to bone in humans.

Answer: Tendon

c.   Tissue that transports food in plants.

Answer: Phloem

d.   Tissue that stores fat in our body.

Answer: Adipose tissue

e.   Connective tissue with a fluid matrix.

Answer: Blood

f.     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:

Answer:

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:

a.   Parenchyma

b.   Collenchyma

c.   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:

a.   Cells are branched fibres.

b.   Striations are present on cells.

c.Cells are capable of continuous contraction and relaxation.