NCERT Solutions Class 9 Science Chapter 6 Tissues
NCERT Solutions Class 9 Science Chapter 6 Tissues: National Council of Educational Research and Training Class 9 Science Chapter 6 Solutions – Tissues. NCERT Solutions Class 9 Science Chapter 6 PDF Download.
NCERT Solutions Class 9 Science Chapter 6: Overview
Board |
NCERT |
Class |
9 |
Subject |
Science |
Chapter |
6 |
Chapter Name |
Tissues |
Topic |
Exercise Solutions |
NCERT Solutions Class 9 Science Chapter 6 – Tissues
- TEXTBOOK QUESTIONS
1.) What is a tissue?
Ans. Cells of the body working together in unity to perform a specific function in the body. This particular group of cellsat a place which has similar structure and perform a special function together as a group is known as a tissue
2.) What is the utility of tissues in multi-cellular organisms?
Ans. Multi cellular organisms are made up of tissues in which division of functions is assigned. Hence these tissues perform specialized functions necessary for life.
3.) Name types of simple tissues.
Ans. There are three main types simple tissue
1.) Parenchyma: it is the simplest type of tissue made of unspecialized cells with thin cell walls.
2.) Collenchyma: It is a flexible tissue which provides mechanical support to plants.
3.) Sclerenchyma. It is the dead tissue which makes the plant hard and stiff. The cells of this tissue are lignified, long and narrow.
4.) Where is apical meristem found?
Ans. Apical meristematic tissue is present in growing stem tips and roots. It is responsible of increase in length of stem and roots.
5.) Which tissue makes up the husk of coconut?
Ans. Sclerenchyma is the simple permanent meristematic tissue which makes up the husk of coconut. This is a dead lignified tissue which makes the husk hard and stiff.
6.) What are the constituents of phloem?
Ans. Phloem forms the vascular bundle is made up of the following cells sieve cells, sieve tubes, companion cells, phloem fibers and the phloem parenchyma.
7.) Name the tissue responsible for movement in our body.
Ans. Movement is a quality present in animals. The main tissues responsible for bring about movement is the nervous tissue and muscular tissue.
8.) What does a neuron look like?
Ans. The cells which make up the nervous tissue are called neurons. A neuron is made up of body containg a nucleus and cytoplasm. To this body an axon which is a long thin hair-like process arise. Short, branched processes similar to the axon are called dendrites.
9.) Give three features of cardiac muscles.
Ans. The cardiac muscles are present in the heart. These are involuntary muscles. the cardiac muscles have a rhythmic contraction and relaxation movement throughout life. Cardiac muscle cells are cylindrical, branched and uninucleate.
10.) What are the functions of areolar tissue?
Ans. It is a type of a connective tissue. It is found in spaces between skin and muscle cells. This tissue is also a part of connective tissue present in blood vessels, nerve cells and bone marrow. Areolar connective tissue gives structural support to the internal organs. It also fills in space between and inside organs. These tissues also help in tissue repair,
- Exercise questions:
1.) Define the term tissue?
Ans. It is defined as a group of cells which perform specific function and have structural similarity.
2.) How many types of elements together make up the xylem tissue? Name them.
Ans. Xylem is part of the vascular tissue in plant cells. The xylem tissue is composed of two main types of cells, Vessels and trachides. Apart from this xylem fiber and xylem parenchyma are also elements that make up the xylem tissue.
3.) How are simple tissues different from complex tissues in plants?
Ans. There are the following differences in simple and complex tissues in plants:
Sr.No. | Simple tissue | Complex tissue |
1. | Simple tissue is made up of only one type of cell. | Complex tissues are made up of different types of cells |
2. | As only one type of cell is present only one specialized function can be performed | More than one specific function can be performed by complex tissues. |
3. | Example includes parenchyma cells | Example includes xylem and phloem tissues. |
4.) Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Ans. Following are the differences in parenchyma, collenchyma and sclerenchyma cells:
Parenchyma | Collenchyma | Sclerenchyma |
Parenchyma cell walls is made up of cellulose andare quite thin. | Collenchyma cell wallsirregularly thickened at the edges. | Sclerenchyma cell walls lignified, which makes them quit thick. |
5.) What are the functions of the stomata?
Ans. Stomata are the pores or small openings on the surface of leaf. The main function of stomata is exchange of gases with the surrounding environment. The other important function is to carry out transpiration in which water vapor is given out of the plant cells.
6.) Show the difference between the three types of muscle fibers.
Ans. The three muscle fibers are
- Cardiac muscles: These are involuntary muscles cells present in the heart. Cardiac muscles cylinder shaped, highly branched and possess a single nucleus.
- Smooth muscles: Smooth muscles are mainly found in the linings of blood vessels, alimentary canal. These are spindle shaped cell, which are uninucleate and are involuntary cells.
- Striated muscles: This type of muscle fiber help in movement. They are voluntary in nature and possess many nuclei. The shape of these fibers is cylindrical and are unbranched.
In case you are missed :- Previous Chapter Solution
7.) What is the specific function of the cardiac muscle?
Ans. Cardiac muscles are present in the heart and is responsible for rhythmic contraction and relaxation of the heart.
8.) Differentiate between striated, Unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Ans.
Parameter | Striated muscles | Unstriated muscles | Cardiac muscles |
Structure | These cells are Long, multinucleated, cylindrical and un-branched.
|
These muscle fibers are long, spindle shaped, unbranched and uninucleate. | These cells are Cylindrical, uninucleate and branched.
|
Location in body | These are present in hands, legs and skeletal muscles | These are present wall of stomach, intestine, ureter and bronchi | Cardiac muscles are present in the heart. |
10.) Name the following.
(a) Tissue that forms the inner lining of our mouth
Ans. The epithelial tissue, Squamous epithelium tissue forms the inner lining of our mouth
(b) Tissue that connects muscle to bone in humans
Ans. The tissues that connects muscle to bone in humans are Tendon
(c) Tissue that transports food in plants
Ans. The vascular tissue which transports food in plants is Phloem
(d) Tissue that stores fat in our body
Ans. The Adipose tissue stores fat in our body.
(e) Connective tissue with a fluid matrix
Ans. Blood is a fluid connective tissue.
(f) Tissue presents in the brain.
Ans. The tissue present in the brain is Nervous tissue.
11.) Identify the type of tissue in the following:
Skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Ans. 1. The Striated squamous epithelial tissue forms the skin.
- The bark of tree is made up of cork which is derived from the secondary meristem located in the cortex
- Bones are made up of connective tissue
- Lining of kidney tubule is made up of cuboidal epithelial tissue
- Vascular bundle has 2 types of complex permanent tissue namely xylem and phloem.
12.) Name the regions in which parenchyma tissue is present.
Ans. The parenchyma is found loosely arranged in large spaces between cells of tissues. Chlorenchyma is found in green leaves as it contains chlorophyll. In aquatic plants aerenchyma is present in air sacs and helps the plant to float in water.
13.) What is the role of epidermis in plants?
Ans. The outermost layer of cells covering the plant surface is called epidermis. It is proactive layer of cells in plants.
14.) How does the cork act as a protective tissue?
Ans. Cork cells are present is bark of trees. They are dead cells and provide the plant with protection. they can do this because of their arrangement as there is no intracellular space as there is no space. Also, deposition of suberin make it impermeable to water.
15.) Complete the following chart:
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