NCERT Solutions for Class 9th Science
Chapter 6 – TISSUES
(Complete Downloadable Chapter Solution PDF file is at the bottom of the page)
Q.1 What is a tissue?
Ans A tissue is a group of cells that are similar in structure and/or work together to achieve a particular function. For eg. blood, phloem, muscle etc.
Q.2 What is the utility of tissues in multi-cellular organisms?
Ans Multi-cellular organisms have cells clustered in groups called tissues. These tissues are responsible to perform basic functions like movement, transportation of oxygen, food etc. efficiently. Each specialised function is taken up by a different group of cells i.e. tissue. For eg. in human beings, muscle cells contract and relax to cause movement, nerve cells carry messages, blood flows to transport oxygen, food, hormones and waste material and so on. In plants, vascular tissues conduct food and water from one part of the plant to other parts. So, tissues divide the labour to increase the efficiency in multi-cellular organisms.
Q.3 Name types of simple tissues.
Ans Simple tissues are of three types: Parenchyma, collenchyma and sclerenchyma.
Q.4 Where is apical meristem found?
Ans Apical meristem is present at the growing tips of stems and roots and increases the length of the stem and the root.
Q.5 Which tissue makes up the husk of coconut?
Ans Sclerenchyma tissue.
Q.6 What are the constituents of phloem?
Q.7 Name the tissue responsible for movement in our body.
Q.8 What does a neuron look like?
Q.9 Give three features of cardiac muscles.
Q.10 What are the functions of areolar tissue?
EXERCISES
Q.1 Define the term “tissue”.
Ans A tissue is a group of cells that are similar in structure and/or work together to achieve a particular function. For eg. blood, phloem, muscle etc.
Q.2 How many types of elements together make up the xylem tissue? Name them.
Ans Xylem transports water and soluble mineral nutrients from the roots to other parts of the plant. It consists of tracheids, vessels, xylem parenchyma and xylem fibres.
Q.3 How are simple tissues different from complex tissues in plants?
Q.4 Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Q.5 What are the functions of the stomata?
Q.6 Diagrammatically show the difference between the three types of muscle fibres.
Q.7 What is the specific function of the cardiac muscle?
Q.8 Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Q.9 Draw a labelled diagram of a neuron.
Q.10 Name the following.
(a) Tissue that forms the inner lining of our mouth. (b) Tissue that connects muscle to bone in humans.
(c) Tissue that transports food in plants. (d) Tissue that stores fat in our body.
(e) Connective tissue with a fluid matrix. (f) Tissue present in the brain.
Ans (a) Tissue that forms the inner lining of our mouth – Epithelial tissue
(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
Q.11 Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Q.12 Name the regions in which parenchyma tissue is present.
Q.13 What is the role of epidermis in plants?
Q.14 How does the cork act as a protective tissue?