"AKC SCIENCE CLASSES"
CLASS 09 TH (CBSE AND MP BOARD)
CHAPTER 06
TISSUES
INTEXT QUESTIONS AND ANSWERS
Q.01:- Define the term "tissue".
Ans:- "A group of cells that are similar in structure and work together to achieve particular function, is called a tissue."
In other words we can say in a tissue the cells have more or less alike shape and size and perform the similar function.
Q.02:- How many types of elements together make up the xylem tissue? Name them.
Ans:- Xylem tissue is formed of four types of elements. They are tracheids, vessels, xylem parenchyma and xylem fibers.
Q.03:- How are simple tissue different from complex tissues in plants?
Ans:- Difference between Simple and Complex Tissues :-
| SL No. | Simple Tissues | Complex Tissues |
|---|---|---|
| 1 | Cells :- A simple tissue is formed of only one type of cells. | A complex tissue is made of more than one type of cells. |
| 2 | Activity :- All the cells perform the same function. | The different cells perform different fractions of a function. |
| 3 | Types :- There are three types of simple plant tissues一 parenchyma, collenchyma and sclerenchyma. | There are two types of complex plant tissues一 xylem and phloem. |
| 4 | Function :- They form primary structure of the plant. | They form primary structure of the plant. |
Q.04:- Differentiate amongst parenchyma, collenchyma and sclerenchyma on the basis of the cell wall.
Ans:-
| SL No. | Parenchyma | Collenchyma | Sclerenchyma | ||
|---|---|---|---|---|---|
| 1 | Thickness :- The cell wall is thin. |
|
| ||
| 2 | Smoothness :- It is smooth | It is unevenly | The wall is uniformly thickened. | ||
| 3 | Nature :- Wall is formed of cellulose. | The thickening is pectocellulosic. | The thickening is generally of lignin. |
Q.05:- What are the function of the stomata ?
Ans:- Functions of the stomata are :-
- Gaseous exchange :- Stomata are sites where exchange of gases (carbon dioxide and oxygen) occurs between the plant interior and external environment.
- Transpiration :- Major part of transpiration occurs through stomata. Transpiration removes excess water keeps plant surface cool even in bright sun.
- Regulation :- They regulate both gaseous exchange and transpiration.
Q.06:- Diagramatically show the difference amongst three types of muscle fibers.
Ans:-
Q.07:- What is the specific function of the cardiac muscles ?
Ans:- Rhythmic contraction and relaxation simultaneously throughout the life without getting fatigued.
Q.08:- Differentiate amongst striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Ans:-
Q.09:- Draw the labelled diagram of a neuron.
Ans:-
Q.10:- Name the following :-
(a) Tissue that forms the inner lining of our mouth.
Ans:- Epithelial tissue.
(b) Tissue that connects muscle to bone in humans.
Ans:- Tendon
(c) Tissue that transport food in plants.
Ans:- Phloem
(d) Tissue that stores fat in our body.
Ans:- Adipose
(e) Connective tissue with a fluid matrix.
Ans:- Blood.
(f) Tissue present in the brain.
Ans:- Nervous tissue.
Q.11:- Identify the types of tissue in the following : skin, brak of tree, bone, lining of kidney tubule, vascular bundle.
Ans:- (a) Skin → Epithelial tissue.
(b) Bark of Tree → Cork (Protective tissue)
(c) Bone → Connective tissue with solid matrix
(d) Lining of kidney Tubule → Epithelial tissue
(e) Vascular Bundle → Complex or vascular tissues, xylem and phloem.
Q.12:- Name the regions in which parenchyma tissue is present.
Ans:- It occurs in almost all non-body parts of the plants :- cortex, pith, medullary rays of stem, cortex and pith of root, chlorenchyma of leaves, flowers, pith of fruits, etc. Epidermis is special type of parenchyma.
Q.13:- What is the role of epidermis in plants ?
Ans:- The role of epidermis in plants are :-
- Protection,
- Regulation of transpiration,
- Formation of insulating stationary air layer with the help of hair.
- Exchange of gases.
Q.14:- How does the cork act as a protective tissue?
Ans:- Cork acts as a protective layer because its cells are dead, filled with tannins, resin and air, impermeable due to deposition of suberin over the cell walls and absence of intercellular spaces. It is insulating (heat proof), fire proof, shock proof, water proof, and repellent to microbes and animals.
Q.15:- Complete the table :-
