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.
Which tissues are called covering or protective tissues?
Q 3.
What is main purpose of stratified epithelium?
Q 4.
Where do you find collenchyma tissues in plants?
Q 5.
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 6.
Which plant tissues are often called as stone cells?
Q 7.
How are complex tissues different from simple tissues?
Q 8.
How does epidermis help xerophytes?
Q 9.
Why are Xylem and Phloem known as complex permanent tissues?
Q 10.
Name the following:
Animal tissue having rhythmic contraction and relaxation throughout life.
Q 11.
Where do we find epithelial tissues on animal body?
Q 12.
What is the common characteristic in different connective tissues?
Q 13.
What is the unit of nervous tissues?
Q 14.
How long a nerve cell can be?
Q 15.
How are muscles tissues related to nerve cells?
Q 16.
Fill In the Blanks :
The study of the structure of tissues and organs is known as ______ .
Q 17.
Fill In the Blanks :
Xylem is composed of _______, ______, ________ and _______.
Q 18.
Name the following:
Supportive plant tissues containing stone cells.
Q 19.
Name the following:
Human tissue that helps in the movement of ova in the fallopian tube.
Q 20.
Where do you find Parenchyma cells in Plants?
Q 21.
List the cellular elements of xylem tissue?
Q 22.
Why do meristematic cells lack vacuoles?
Q 23.
Where blood is formed in our body?
Q 24.
Give three features of cardiac muscles.
Q 25.
List the functions of the epidermis.
Q 26.
Why the cell walls of collenchyma tissues are unevenly thickened?
Q 27.
Name the chemical released by cork cells?
Q 28.
Name two types of complex tissues.
Q 29.
Why are Xylem and Phloem are called vascular or conducting tissues?
Q 30.
Which plant tissue is considered to have played an important role in the survival of terrestrial plants?
Q 31.
How will you identify Columnar epithelium? Where are these tissues located?
Q 32.
What is Haematology?
Q 33.
Which connective tissue connects bones to muscles?
Q 34.
Why are striated muscles called skeletal muscles?
Q 35.
What is myelin sheath? Where do we find it?
Q 36.
Fill In the Blanks :
Permanent tissues are those which have lost the capacity to _____.
Q 37.
Name the following:
Connective Tissue with a fluid matrix
Q 38.
Name the following:
Plant tissue help in bending leaf stalk
Q 39.
Name the following:
Type of Connective Tissue having matrix made of calcium phosphate
Q 41.
Which tissues are responsible for the secondary growth of plants?
Q 42.
Are Collenchyma tissues present in roots of the plants?
Q 43.
Why vascular tissue is considered a distinctive feature responsible for the survival of plants in terrestrial plants?
Q 44.
Which Phloem cellular element has a tubular structure with perforated walls?
Q 45.
What is the main function of cuboidal epithelium?
Q 46.
Name different types of connective tissues?
Q 47.
What are constituents of blood tissue?
Q 48.
What are different types of muscle tissues? Also list which of these are voluntary or involuntary.
Q 49.
What is the utility of tissues in multi-cellular organisms?
Q 50.
Which tissue makes up the husk of coconut?
