Tissues Flashcards
What is a tissue?
It is a group of cells similar in structure and function
What is the difference between plant tissues and animal tissues?
Plant tissues-
1) tissue organisation is targeted towards the stationery habits of plants
2) organisation is simple
3) most of the tissues are dead
4) growth is confined to areas
5) less maintenance energy is required
6) plants grow continuously throughout life
Animal tissues-
1) tissue organisation is targeted towards the mobility of animals
2) organisation is complex
3) most of the tissues are living
4) growth is not confined to areas
5) more maintenance energy is required
6) after reaching a maturity age animals stop showing further growth
What is the utility of tissues in multicellular organisms?
Formation of tissues has brought about a division of labour in multicellular organisms. Cells combine to form tissues, tissues get organised to form organs, organs into organ system, and as a result of improved organisation and higher efficiency, multicellular organisms have higher survival
What are the two types of plant tissues?
Meristematic tissues and permanent tissues
Growth of plants occur only in certain specific regions. justify.
The growth of plants occur only in a certain specific region because the dividing tissue also known as the meristematic tissue is located at these points
What are the types of meristematic tissues and also mention their location and function?
Apical meristem- it is present at the growing tips of roots and stems and it increases the length of roots and stems
Lateral meristem- it is present on the lateral sides of the stem or root and it increases the girth of the stem or root.
Intercalary meristem- it is located near the node and it help to increase the length of the part in which it is present.
Write the function of cells of meristematic tissues.
1) they are very active
2) they have dense cytoplasm
3) they have thin cellulose
4) they have prominent nuclei
5)they lack vacuoles
Give reason, meristematic cell have a prominent nucleus and dense cytoplasm but they lack vacuoles?
Meristematic cells have a prominent nucleus and a dense cytoplasm but lack vacuole because they continuously need energy for dividing so they do not have much food to store in
What happens to the cell formed by meristematic tissues?
They take up specific role and lose their ability to divide as a result they form permanent issues
What is meant by differentiation?
The process of taking up a permanent shapes size and the function by the cell of meristematic tissue once lose the ability to divide is called differentiation
Difference between simple permanent tissue and complex permanent tissue?
Simple permanent tissue-
1) it consists of one type of cell
2) for example parenchyma, collenchyma, schlerenchyma
Complex permanent tissue-
1) it consists of more than one type of cell
2) for example xylem and phloem
Define parenchyma.
It consists of relatively unspecialised cells with thin cell wall, they are living cells which are usually loosely arranged, these tissues generally stores food, in some situation it contains chlorophyll and performs photosynthesis and is called chlorenchyma.
Define arenchyma
In aquatic plants there are large air cavities in parenchyma which help them to float this type of parenchyma is known as arenchyma.
Write the location of parenchyma.
This is found in the non woody area or the soft part of stems and roots
Characteristics of the cell of collenchyma tissue.
They are living cells
They do not have intercellular space
These cells are irregularly thickened at the corners
