Lesson- Tissue
Class-
9
1. What is a tissue?
Ans-
Tissue is a group of structurally and functionally similar cells having common
origin and common function.
2. What is the utility of tissues in
multicelluar organisms?
Ans-
Tissues provide division of labour, complex organization and higher efficiency.
This provides multicellular organisms more successful a better survival.
3. Name types of simple tissues.
Ans-
The simple tissues in plants are basically of three types: a) parenchyma, b)
collenchymas, and c) sclerenchyma.
4. Where is apical meristem found?
Ans-
At the tip of roots, shoots, branches and leaves, i.e., in the growing parts of
the plant.
5. Which tissue makes up the husk of
coconut?
Ans- The husk of a coconut is made up of
fibers of sclerenchymatous tissue.
6. What are the constituents of phloem?
Ans-
Phloem is made up of four type’s cells, sieve tube cells, companion cells,
phloem parenchyma cells and phloem fibers.
7. Name the tissue responsible for
movement in our body.
Ans-
Muscular tissue. Muscle cells contain special contractile proteins with the
ability to contract and relax to cause movement.
8. What does a neuron look likes?
Ans- A
neuron looks like a star. The cell body or cyton with its projecting dendrites
gives the impression of a twinkling star.
9. Give three features of cardiac
muscles.
Ans-
a. Cardiac muscles are involuntary.
b.Cardiac muscles cells are
cylindrical , branched and uninucleate.
c. Cardiac muscles show
rhythmic contraction and relaxation throughout life.
10. Give three features of cardiac
muscles.
Ans-
a. Aerolar tissue fills spaces between tissues and organs.
b. It provides support, elasticity and
strength to body parts.
c. It binds different tissues
together.
d. It helps in healing wounds and in
tissue repair.
e. It helps in fighting foreign
antigens and toxins.
11. How many types of elements together make up
xylem tissue? Name them.
Ans-
four types of elements make up xylem tissue. They are:
a. Tracheids c. vessels
b. Xylem parenchyma d. Xylem sclerenchyma.
12. How are simple tissues different from
complex tissues?
Ans-
s.no.
|
Simple tissues
|
Complex tissues
|
1.
2.
|
Made up
of one type of cells.
They
perform a variety of functions like protection, storage, mechanical supports,
etc.
Examples:
parenchyma, collenchymas and sclerenchyma.
|
1.
Made up of more
than one type of cells.
2.
They help in
conduction of water, minerals and food to different parts of plant body.
Examples:
Xylem and phloem.
|
13. Differentiate between parenchyma, collenchymas and sclerenchyma on the basis of their cell wall.
Ans-
Parenchyma
|
Collenchyma
|
sclerenchyma
|
1. Cell
wall is primary.
2. Cell
wall is thin and made up of cellulose.
|
1. Cell
wall is primary.
2. Cell
wall has localized thickening of cellulose.
|
1. Cell
wall is secondary.
2. Cell
wall is very thick obliterating internal cellular space. Cell wall is
thickened due to deposition of lignin.
|
14. Differentiate among striated, unstriated and cardiac muscles on the basis of their structure and site in the body.
Ans-
|
Striated
muscles
|
Non-striated
muscles
|
Cardiac
muscles
|
1.Location
2.Shape of fibers
3.No. of nuclei
4.Position of nuclei
5.Cross striations or bands
6.Sacrolemma
7.Internalated disc
8.Speed of contraction
9.Abilitu to remain contracted
10.Type of control
11.Nervous supply
|
Attached to bones in limbs, etc.
Form bundles.
Long, cylindrical with blunt ends.
Multinucleate
Peripheral
Dark and light bands
Present
Absent
Most rapid
Least, get fatigued very soon.
Voluntary
From central nervous system
|
Walls
of viscera, stomach, intestine, blood vessels, etc.
Form
sheet or occur as sphincter.
Long
and spindle-shaped.
Uninucleate
Central
Band
not found
Absent
Absent
Slowest
Greatest,
can remain contracted for long.
Involuntary
From
autonomic nervous system.
|
In the
wall of heart.
Form a
network.
Short,
cylindrical with branched ends.
Uninucleate
Central
Dark
and light bands
Present
Present
Intermediate
Intermediate,
contract rhythmically, and never get tired.
Involuntary
From
autonomic nervous system
|
14. What are the functions of stomata?
Ans- 1. Stomata help in gaseous
exchanges during respiration and photosynthesis.
2. They also help in transpiration by
allowing the water vapor to diffuse into the atmosphere.
15. What is the specific function of
cardiac muscles?
Ans- They contract tirelessly and rhythmically to pump blood in blood vessels so
that blood may reach every part of the body.
17. Draw a labeled diagram of a neuron.
Ans-
18. 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. squamous epithelium
b.Tendon (fibrous connective tissue)
c.Phloem
d.Adipose tissue
e.Blood
f. Nervous tissue
19. Identify the type of tissue in the following:
a.skin b. bark of tree c. bone d. lining of kidney tubule
e.
vascular bundle
Ans-
a) skin: Squamous epithelium
b)
Bark of tree: cork (protective tissue)
c)
Bone: connective tissue (skeletal tissue)
d) Lining of kidney tubules: cuboidal
epithelium (epithelium)
e) Vascular bundle: Xylem and phloem
20.Name the regions in which parenchyma
tissue is present.
Ans- parenchyma tissue is present in the cortex and ground tissue of
stem and roots in the mesophyll region of leave.
21. What is the role of epidermis in
plants?
Ans- Epidermis protects the plant from i) water loss by desiccation and ii)
infection by preventing of pathogen.
22. How does the cork act as a protective
tissue?
Ans- a) Cork
is formed of several layers of dead cells arranged compactly without
intercellular spaces. The wall of cork cell contains an organic substance
called suberin. The cork cell remains filled by resin or tannins. Suberin and
resin protect the plant from desiccation, infection and mechanical injur
23. Complete the flowchart.
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