Question:
Explain the statement 'Tissues exhibit division of labour'. Give examples.
Answer:
In multicellular organisms, there are millions of cells. Each specialised function is taken up by a different group of cells called tissue. Or Group of cells, forming a tissue are capable of doing a particular function efficiently. Thus Different tissues carry out different types of functions. E.g. In human beings, muscle cells contract and relax to cause movement, nerve cells carry messages, blood flows to transport oxygen, food, hormones and waste material and so on. In plants, vascular tissues conduct food and water from one part of the plant to other parts. So, multicellular organisms show the division of labour.
Tissues
Q 1.
What are the identifying features of collenchyma tissue?
Q 2.
What is main purpose of stratified epithelium?
Q 3.
Where do you find collenchyma tissues in plants?
Q 4.
Which tissues are called covering or protective tissues?
Q 5.
How are complex tissues different from simple tissues?
Q 6.
Which tissues are responsible for the axial growth of plants?
Q 7.
Name the following:
Tissues present in lung alveoli
Q 8.
Name the following:
Tissues also called erthyrocytes and transport oxygen.
Q 9.
Name the following:
Animal tissue having rhythmic contraction and relaxation throughout life.
Q 10.
Identify which of the following plant tissues are living or dead?
Apical Meristem, Parenchyma, Aerenchyma, Collenchyma, Sclereids, Tracheids, Xylem Fibres, Xylem Parenchyma, Phloem fibre, Phloem Parenchyma, Vessel, Sieve Tubes
Q 11.
List the characteristics of meristematic tissues.
Q 12.
Which plant tissues are often called as stone cells?
Q 13.
What is Haematology?
Q 14.
What are different types of muscle tissues? Also list which of these are voluntary or involuntary.
Q 15.
How long a nerve cell can be?
Q 16.
Fill In the Blanks :
____________ is the parenchyma with large number of chloroplasts.
Q 17.
Name the following:
Supportive plant tissues containing stone cells.
Q 18.
Name the following:
Human tissue that helps in the movement of ova in the fallopian tube.
Q 19.
Why do animals tissues require more energy as compared to plant tissues?
Q 20.
Where do we find intercalary meristem?
Q 21.
What do you mean by 'Differentiation' in plant tissues?
Q 22.
Why the cell walls of collenchyma tissues are unevenly thickened?
Q 23.
List the cellular elements of xylem tissue?
Q 24.
What is the role of xylem tissue?
Q 25.
Name the cellular elements of Phloem tissue.
Q 26.
Where do we find glandular columnar epithelia? What are their main role?
Q 27.
Name the following:
Connective Tissue with a fluid matrix
Q 28.
Why do plants have more dead tissues as compared to animals?
Q 29.
Are Collenchyma tissues present in roots of the plants?
Q 30.
Name the chemical released by cork cells?
Q 31.
Which Phloem cellular element has a tubular structure with perforated walls?
Q 32.
Why are Xylem and Phloem known as conducting tissues?
Q 33.
Why do meristematic cells lack vacuoles?
Q 34.
Where do we find epithelial tissues on animal body?
Q 35.
What is simple stratified epithelium? Where do we find these tissues?
Q 36.
How will you identify Columnar epithelium? Where are these tissues located?
Q 37.
What is the main purpose of columnar epithelium?
Q 38.
What is the common characteristic in different connective tissues?
Q 39.
What does plasma contain?
Q 40.
Where blood is formed in our body?
Q 41.
Name the two fluid connective tissues.
Q 42.
Identify the location of the following connective tissues.
(a) Blood
(b) Lymph
(c) Bone
(d) Cartilage
(e) Tendons
Q 43.
Which connective tissue connects bones to muscles?
Q 44.
Where do we find Areolar tissue? What are its functions?
Q 45.
Why are striated muscles called skeletal muscles?
Q 46.
What are identification marks of striated muscles when seen under microscope?
Q 47.
Name the three distinct parts of a neuron.
Q 48.
Fill In the Blanks :
The study of the structure of tissues and organs is known as ______ .
Q 49.
Fill In the Blanks :
Xylem is composed of _______, ______, ________ and _______.
Q 50.
Name the following:
Type of Connective Tissue having matrix made of calcium phosphate
