Ans: Tissue is group of cells that are same in shape and perform similar functions.
It occurs as a group of cells at a definite place in a body.
Q. What is the utility of tissues in multi-cellular
organisms?
Ans: The multicellular organisms have different types of tissues
which perform different functions by division of labour.
This enhances efficiency in the life processes in these organisms.
Ans: Meristematic tissue is a group of dividing cells that occur at certain specific regions in a plant.
These cells have dense cytoplasm, thin cellulose walls and prominent nuclei.
It has three types i.e. Apical, Intercalary and Lateral.
Apical meristem is found on growing tips of stem and root. It helps in increase in length of plant.
Lateral meristem increases girth of plant.
Intercalary meristem occurs at internodes.
Ans: Apical meristem is found on growing tips of stem and root. It helps in increase in length of plant.
Or
Differentiate between Parenchyma, Collenchyma, Sclerenchyma?
Ans: Simple permenant tissue is made of only one type of cells.
It is formed when meristematic tissue looses the ability to divide.
Simple permenant tissue is of three types:
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
1. Parenchyma: Parenchyma is basic packing tissue made of unspecilized cells with thin cell wall.
It has live cells.
It has loosely packed cells with large intracellular space.
2. Collenchyma: collenchyma give flexibility and mechanical support to the plant.
It has elongated cells, thick at corners with little intercellular space.
3. Sclerenchyma: Sclerenchyma provide strength to the plant.
It has dead cells.
The cells with thick walls made of lignin with no intercellular space.
Ans: Parenchyma occurs in soft parts of plant.
It provides support and stores food.
Ans: The husk of coconut is made of Sclerenchyma which is a simple permenant tissue.
Q. What is the role of Epidermis in plants?
Or
Write a note on epidermis.
Ans: Epidermis is single outermost layer of cells in plants.
It has no intercellular spaces.
It protects plant from water loss, injury and fungal attack.
In arial parts of plant, it secretes waxy, water resistant layer.
In roots, it has root hairs.
Ans: Cork is dead, compact tissue. It contains suberin.
Cork is protective in function.
It prevents loss of water, infection and injury.
Or
Write a note on xylem and phloem.
Ans: Complex permenant tissue is made of more than one type of cells.
It is of two types, Xylem and Phloem.
1. Xylem: Xylem is conducting tissue.
It conducts water and minerals.
It provides strength to plant.
It consists of tracheids, vessels, Xylem parenchyma and Xylem fibers.
2 Phloem: Phloem is conducting tissue.
It conducts food.
It consists of sieve tubes, companion cells, phloem parenchyma and phloem fibers.
Ans: Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibers.
Ans: Xylem consists of tracheids, vessels, Xylem parenchyma and Xylem fibers.
3. How are simple tissues different from complex tissues in
plants?
Ans:
|
Simple Tissue |
Complex
Tissue |
|
It is made of
only one type of cells |
It is made of
many types of cells |
|
It provides protection
and support to the plant |
It helps in
transport of water, minerals and food |
|
It helps
plants to grow |
It has no
role in the growth of plant |
|
E.g. meristematic
tissue, Parenchyma, Collenchyma, Sclerenchyma |
E.g. Xylem, Phloem
|
Q. What are the functions of the stomata?
Ans: Stomata are tiny pores on the leaves surrounded by
guard cells. The function of stomata include:
It helps in Gaseous exchange
It helps in Transpiration
It helps in Photosynthesis
Ans: Epithelial tissue is protective covering of organs and body cavities.
It is compact and forms continuous sheet.
It has no intercellular spaces.
Epithelial tissue has following types:
1. Squamous: The cells are thin and flat. It can be simple squamous or stratified squamous.
It is found in skin, blood vessels, lung alveoli.
2. Columnar: The cells are tall pillar like. It helps in absorption and secretion.
It is found in stomach, intestines etc.
3. Cuboidal: The cells are cube shaped. It helps in absorption, secretion, excretion and mechanical support.
It is found in glands, kidney tubules etc.
Ans: Connective tissue specilizes in connection and anchoring of body organs.
Its main function is binding, support of organs togather.
The cells of this tissue are loosely spaced inside matrix.
It is of many types:
1. Blood: It has RBCs, WBCs, Platlets in plasma matrix.
2. Bones: It has bone cells in calcium matrix.
3. Ligament: It connects two bones.
4. Tendon: It connects bone with muscle.
5. Cartilage: It is present in joints, nose, ear, trachae, larynx etc
6. Areolar tissue: It supports internal organs. It is also found between skin and muscles, around blood vessels.
Ans: The areolar tissue supports internal organs.
It fills space inside organs.
It is also found between skin and muscles, around blood vessels.
Q. What is muscular tissue? What are its types?
Or
Diagrammatically show difference between three types of muscle fibers.
Or
Differentiate between stratified, unstratified and cardaic muscles?
Ans: Muscle tissue consists of muscle fibers. It is responsible for movements in body.
Muscular tissue is of many types;
1. Stratified muscles: They are present in limbs.
They are voluntary muscles.
They are long, clynderical, unbranched and have many nucleus.
They show alternate light and dark bands on microscope.
2. Unstraited muscles: They are present in iris, uterus, alimentary canal etc.
They are involuntary muscles.
They are long, spindle shaped and have one nucleus.
3. Cardiac muscles. They are present in heart.
They are involuntary and show rhythmic contraction and relaxation.
They are cylindrical, branched and have one nucleus.
Q. Name the tissue responsible for movement in our body.
Ans: Muscular tissue is responsible for the movement in our
body.
It is of many types such as Cardiac, Smooth and Skeletal.
Q. What is the specific function of the cardiac muscle?
Ans: The muscles present in the heart are called cardiac
muscles. Their specific function is the contraction and relaxation of Heart.
Q. Give three features of cardiac muscles.
Ans: The three features of Cardiac muscles are:They are branched
They are single nucleus
They are involuntary
10. Name the following.
(a) Tissue that forms the inner lining of our mouth: Squamous Epithelium 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. Identify the type of tissue in the following: skin, bark
of tree, bone, lining of kidney tubule, vascular bundle.
Ans:
|
Skin |
Epidermis |
|
Bark of Tree |
Simple Permanent
tissue |
|
Bone |
Connective Tissue |
|
Lining of
Kidney Tubule |
Cuboidal
Epithelium |
|
Vascular
Bundle |
Complex Permanent
tissue |
Ans:
Q. Complete the following chart:
