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.
Which tissues are responsible for the axial growth of plants?
Q 6.
How are complex tissues different from simple tissues?
Q 7.
Why do animals tissues require more energy as compared to plant tissues?
Q 8.
What are the general identifying features of epithelial tissues?
Q 9.
Fill In the Blanks :
Xylem is composed of _______, ______, ________ and _______.
Q 10.
Which plant tissues are often called as stone cells?
Q 11.
Name the two fluid connective tissues.
Q 12.
Which connective tissue connects bones to muscles?
Q 13.
Name the three distinct parts of a neuron.
Q 14.
Fill In the Blanks :
Protective tissues include ______ and _____.
Q 15.
Where do we find intercalary meristem?
Q 16.
Why the cell walls of collenchyma tissues are unevenly thickened?
Q 17.
What are different types of muscle tissues? Also list which of these are voluntary or involuntary.
Q 18.
How long a nerve cell can be?
Q 19.
Fill In the Blanks :
The study of the structure of tissues and organs is known as ______ .
Q 20.
Name the following:
Connective Tissue with a fluid matrix
Q 21.
Why do plant tissue require less amount of energy in comparison to animal tissues?
Q 22.
How does epidermis help xerophytes?
Q 23.
Is xylem (or phloem) homogenous tissue or heterogeneous tissue?
Q 24.
Why are Xylem and Phloem known as conducting tissues?
Q 25.
What is simple stratified epithelium? Where do we find these tissues?
Q 26.
What are the constituents of connective tissues?
Q 27.
Why are striated muscles called skeletal muscles?
Q 28.
Name the following:
Animal tissue having rhythmic contraction and relaxation throughout life.
Q 29.
Which tissue makes up the husk of coconut?
Q 30.
Name the tissue responsible for the movement in our body.
Q 31.
What does a neuron look like?
Q 32.
What do you mean by 'Differentiation' in plant tissues?
Q 33.
What is aerenchyma?
Q 34.
Where do we find epithelial tissues on animal body?
Q 35.
What is the shape of cuboidal epithelium? Where do we find these tissues?
Q 36.
How are muscles tissues related to nerve cells?
Q 37.
Fill In the Blanks :
____________ is the parenchyma with large number of chloroplasts.
Q 38.
Name the following:
It provides buoyancy to lotus plant help it float.
Q 39.
Name the following:
Human tissue that helps in the movement of ova in the fallopian tube.
Q 40.
Name the following:
Tissues also called erthyrocytes and transport oxygen.
Q 41.
List the characteristics of meristematic tissues.
Q 42.
Name the chemical released by cork cells?
Q 43.
Why are Xylem and Phloem are called vascular or conducting tissues?
Q 44.
List the cellular elements of xylem tissue?
Q 45.
List functions of phloem tissue?
Q 46.
Which Phloem cellular element has a tubular structure with perforated walls?
Q 47.
Based on layer and shape of cells, how Epithelial tissues can be classified?
Q 48.
What are constituents of blood tissue?
Q 49.
What does plasma contain?
Q 50.
Where do we find Areolar tissue? What are its functions?
