Chapter 6 . Tissues

Class 9 Science Chapter 6 . Tissues Internal Questions and Answers :

Internal Questions :

1. What is a tissue?

Answer : A tissue is a group or collection of similar cells that work together to perform a specific function in an organism. Tissues can be found in various organs and systems throughout the body.
2. What is the utility of tissues in multi-cellular organisms?

Answer : Tissues in multicellular organisms serve to group specialized cells with similar functions. They enable efficient organization, coordination, and division of labor among cells, essential for carrying out specific tasks and maintaining the organism's health.

Internal Questions :

1. Name types of simple tissues.

Answer : The types of simple tissues in plants are parenchyma, collenchyma, and sclerenchyma.
2. Where is apical meristem found?

Answer : Apical meristem is found at the tips of roots and stems in plants, where it is responsible for primary growth.
3. Which tissue makes up the husk of coconut?

Answer : Sclerenchymatous tissue .
4. What are the constituents of phloem?

Answer : The phloem consists of sieve tube elements, companion cells, phloem fibers, and phloem parenchyma cells. These components work together to transport organic nutrients, such as sugars, throughout the plant.

Internal Questions :

1. Name the tissue responsible for movement in our body.

Answer : The tissue responsible for movement in our body is muscle tissue.
2. What does a neuron look like?

Answer : A neuron, also known as a nerve cell, typically has a cell body with branching extensions called dendrites, a long extension called an axon, and specialized structures such as synapses for communication with other neurons.
3. Give three features of cardiac muscles.

Answer : Three features of cardiac muscles are:

(i) They contract without conscious control.

(ii) They have a striped appearance under a microscope.

(iii) These structures allow rapid communication between cardiac muscle cells.

4. What are the functions of areolar tissue?

Answer : The functions of areolar tissue are :

The functions of areolar tissue are:

(i) Providing support and elasticity to organs.

(ii) Holding and cushioning organs in place.

(iii) Allowing for the movement of immune cells to defend against infection.

(iv) Facilitating the exchange of nutrients and waste between blood vessels and cells.

Class 9 Science Chapter 6 Tissues Exercise Questions and Answers :

1. Define the term “tissue”.

Answer : Tissue is a group of cells similar in structure and function .
2. How many types of elements together make up the xylem tissue? Name them.

Answer : Four types of elements together make up the xylem tissue:

Tracheids: Elongated, tapering cells with lignified walls that transport water and minerals.

Vessel Elements: Wide, short cells with perforations in their walls for efficient water transport.

Xylem Parenchyma: Parenchyma cells that store nutrients and provide metabolic support.

Xylem Fibers: Long, thick-walled cells that provide mechanical support to the plant.

3. How are simple tissues different from complex tissues in plants?

Answer :  The main differences between simple tissues and complex tissues in plants:

Characteristic	Simple Tissues	Complex Tissues
Composition	Made up of similar cell types	Made up of different cell types
Function	Perform a specific function	Perform multiple functions
Examples	Parenchyma, Collenchyma, Sclerenchyma	Xylem, Phloem
Location in Plant	Found in various plant parts	Typically in vascular tissues

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

Answer :  The difference between parenchyma, collenchyma, and sclerenchyma on the basis of cell wall are :

Characteristic	Parenchyma	Collenchyma	Sclerenchyma
Cell Wall Composition	Thin, primary cell wall	Unevenly thickened primary cell wall	Thick, rigid secondary cell wall
Flexibility	Flexible and stretchable	Flexible but less than parenchyma	Rigid and inflexible
Support Function	Provides minimal support	Provides flexible support	Provides strong structural support
Location	Found in various plant parts	Often in stems and leaves	Commonly in mature plant parts

5. What are the functions of the stomata?

Answer : Stomata are tiny openings on plant leaves that serve two main functions:

(i) They allow for the exchange of gases, enabling plants to take in carbon dioxide () for photosynthesis and release oxygen () and

(ii) They regulate water loss by controlling transpiration.

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

Answer : The difference between the three types of muscle fibres are :

(i) Striated muscle :

  

(ii) Smooth muscle :

(iii) Cadiac muscle :

7. What is the specific function of the cardiac muscle?

Answer : The specific function of cardiac muscle is to generate contractions that pump blood throughout the body. It forms the walls of the heart, allowing it to efficiently contract and relax, maintaining blood circulation and supplying oxygen to tissues.
8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.

Answer :  Difference between striated, unstriated and cardiac muscles on the basis of structure and site/location in the body are :

Characteristic	Striated Muscles	Unstriated (Smooth) Muscles	Cardiac Muscles
Structure	Have visible stripes (striations)	Lack visible stripes	Have faint striations
Voluntary Control	Voluntary (controlled consciously)	Involuntary (no conscious control)	Involuntary (no conscious control)
Location in the Body	Skeletal muscles (attached to bones)	Found in internal organs (organs of digestive, respiratory, and circulatory systems)	Heart (myocardium)

9. Draw a labelled diagram of a neuron.

Answer : The diagram of a neuron :

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.

Answer : (a) The tissue that forms the inner lining of our mouth is called epithelial tissue, specifically stratified squamous epithelium.

(b) The tissue that connects muscle to bone in humans is called tendon.

(c) The tissue that transports food in plants is called phloem.

(d) The tissue that stores fat in our body is called adipose tissue.

(e) The connective tissue with a fluid matrix is called blood.

(f) The tissue present in the brain is called nervous tissue.

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

Answer : The type of tissues are:

Skin: The tissue in the skin is stratified squamous epithelial tissue.

Bark of tree: The tissue in the bark of a tree is cork cambium, which is a type of meristematic tissue.

Bone: The tissue in bones is osseous or bone tissue.

Lining of kidney tubule: The tissue in the lining of kidney tubules is cuboidal epithelial tissue.

Vascular bundle: The tissue in vascular bundles is complex tissue, specifically xylem and phloem tissues.

12. Name the regions in which parenchyma tissue is present.

Answer : Parenchyma tissue is present in various regions of plants, including the leaves, stems, roots, and fruits. It can be found in the mesophyll of leaves, the cortex and pith of stems and roots, and the flesh of fruits.
13. What is the role of epidermis in plants?

Answer : The epidermis in plants serves several important roles. It acts as a protective outer covering, preventing water loss and serving as a barrier against pathogens. It also regulates gas exchange and absorbs necessary minerals and nutrients from the environment.
14. How does the cork act as a protective tissue?

Answer : Cork acts as a protective tissue in plants by forming a tough outer layer that helps prevent water loss, mechanical damage, and invasion by pathogens. The suberin present in the cork cells provides impermeability and durability, enhancing the protective function.
15. Complete the following chart:

Answer : Simple tissue : Parenchym , collenchyma and sclerenchyma .

Compex tissue : xylem and phloem .