What are Meristematic Tissues? | Infinity Learn
Summary
TLDRThis educational video script explores the concept of meristematic tissues in plants, which are responsible for growth. It introduces three types of meristematic tissues: apical, lateral, and intercalary, each with a distinct role in plant development. Apical meristems are found at the tips of stems and roots, increasing the plant's length. Lateral meristems, or cambium, contribute to the plant's girth. Intercalary meristems are located at the base of leaves or internodes, aiding in the growth of twigs into branches. The script also touches on the cells' need for energy and nutrition and their initial undifferentiated state, which changes post-growth into specialized tissue components.
Takeaways
- 🌿 Plants have two types of tissues: dividing tissues and non-dividing tissues.
- 🔬 Dividing tissues in plants are referred to as 'meristematic' tissues, which originates from the Greek word 'meristos' meaning 'divided'.
- 📍 Meristematic tissues are found in areas of the plant where growth occurs, such as the tips of stems and roots.
- 🌱 There are three main types of meristematic tissues: apical, lateral, and intercalary meristems.
- 🌱🌱 Apical meristem is located at the growing tips of stems and roots and is responsible for increasing the length of the plant.
- 🌱🌲 Lateral meristem, also known as the cambium, is found on the sides of the plant and contributes to the increase in girth.
- 🌱🍃 Intercalary meristem is found at the base of leaves or internodes and aids in the growth of twigs into branches.
- 💧 Meristematic tissues are very active and require a lot of energy and nutrients due to their high metabolic activity.
- 🔄 Initially, meristematic tissues are undifferentiated but specialize into various types after contributing to the plant's growth.
- 🔄🌳 Meristematic tissues perform the function of 'simple growth' before they mature and differentiate into specialized components.
Q & A
What are the two types of tissues found in plants?
-The two types of tissues found in plants are dividing tissues and non-dividing tissues.
What is the technical term for dividing tissues in plants?
-The technical term for dividing tissues in plants is 'meristematic tissues'.
What is the origin of the word 'meristematic'?
-The word 'meristematic' comes from the Greek word 'meristos', which means 'divided'.
Where are meristematic tissues typically found in plants?
-Meristematic tissues are typically found in areas of the plant where growth occurs, such as the tips of stems and roots.
How many different parts of a plant contain meristematic tissues?
-There are three different parts of a plant that contain meristematic tissues.
What are the three main types of meristematic tissues?
-The three main types of meristematic tissues are apical meristem, lateral meristem, and intercalary meristem.
What is the function of apical meristem tissues in plants?
-Apical meristem tissues are found in the growing tips of stems and roots and help increase the length of the plant.
Where is the lateral meristem located and what is its function?
-The lateral meristem is located in the girth or cambium of the plant and its function is to increase the girth of the plant.
In which part of the plant is intercalary meristem found, and what does it facilitate?
-Intercalary meristem is found at the base of leaves or in the internodes, and it facilitates the growth of twigs into branches.
What is a characteristic of cells in meristematic tissues?
-Cells in meristematic tissues are filled with cytoplasm, requiring a lot of energy and nutrition to carry out their functions.
How do meristematic tissues change after the plant has grown?
-After the plant has grown and the meristematic tissues have matured, they change characteristics and differentiate into components of a single tissue, with division of labor taking place only after maturity.
What is the initial state of meristematic tissues before they differentiate?
-At the initial stages, meristematic tissues are not differentiated into any specific types and exhibit the same function of 'simple growth' of the plant.
Outlines
🌿 Introduction to Meristematic Tissues
This paragraph introduces the concept of meristematic tissues in plants, which are responsible for growth. It explains that plants have two types of tissues: dividing and non-dividing. The dividing tissues are further classified into three main types based on their location: apical, lateral, and intercalary meristems. Apical meristems are found at the tips of stems and roots, contributing to the length of the plant. Lateral meristems, also known as the cambium, are responsible for increasing the girth of the plant. Intercalary meristems are located at the base of leaves or internodes and facilitate the growth of twigs into branches. The paragraph also highlights that these tissues are initially undifferentiated and only specialize after contributing to the plant's growth.
Mindmap
Keywords
💡Dividing Tissues
💡Non-Dividing Tissues
💡Meristematic Tissues
💡Apical Meristem
💡Lateral Meristem
💡Intercalary Meristem
💡Growth
💡Differentiation
💡Cytoplast
💡Cambium
Highlights
Plants have two types of tissues: dividing tissues and non-dividing tissues.
Dividing tissues are technically known as meristematic tissues, derived from the Greek word 'meristos' meaning 'divided'.
Meristematic tissues are responsible for cell division and plant growth.
Meristematic tissues are found in areas of the plant that exhibit growth.
Growth in plants is restricted to certain parts, not all parts show growth.
Meristematic tissues are named differently based on their location in the plant.
There are three main types of meristematic tissues in plants.
Apical meristem is found in the growing tips of stems and roots, increasing plant length.
Lateral meristem is associated with the girth or CAMBIUM of the plant, increasing its width.
Intercalary meristem is located at the base of leaves or internodes, facilitating the growth of twigs into branches.
Meristematic tissues are very active and require a lot of energy and nutrients.
At initial stages, meristematic tissues are undifferentiated and perform simple growth functions.
After maturity, meristematic tissues differentiate into components of a single tissue, with division of labor occurring post-maturity.
Characteristics of non-dividing tissues will be studied in the next lesson.
Transcripts
In our last video we studied that plants have
two types of tissues.
Can you name them for me?
What are they called?
Dividing tissues and non-dividing tissues right?
Absolutely correct, now let us look at the
technical terms for these tissues.
In this lesson, we will look at the former
type of tissues.
The dividing tissues in plants are known as
MERISTEMATIC tissues.
Where does the word ‘meristematic’ come from?
It comes from the Greek word
‘meristos’ meaning ‘divided’.
Well, the main function of this tissue is
to divide and help the plant grow.
So where do you think you will find this tissue?
Exactly! They are at all the places where
the plant's parts show growth.
And as we just studied, all the parts of the
plant DO NOT show growth.
Growth is restricted to only certain parts of the plants.
What’s interesting is that meristematic tissues
is named differently based on the part
where it is found.
And do you know how many such parts of plants
have meristematic tissues?
Three different parts.
That’s correct!
Three different parts have meristematic tissues.
The meristematic tissues in each of these parts
has different names.
Let us look at the three main types of meristematic tissues.
The first is the ‘APICAL MERISTEM’,
the second is the ‘LATERAL MERISTEM’
and the third is the ‘INTERCALARY MERISTEM’.
Do not be let down by these difficult names.
Let me make them easy for you to understand.
‘Apical meristem’ tissues are found in
the growing tips of the STEMS and the ROOTS.
This tissue divides and helps increase the
LENGTH of the plant.
What about the second one,
‘Lateral meristem’?
Do you know where it is found in the plant body?
The word lateral means ‘side to side’
and this means the ‘GIRTH’ of the plant.
The ‘lateral meristematic tissue’ divides
and increases the girth of the plant.
‘Apical’ increases the length and ‘lateral’
increases the girth.
This girth of the plant is also known as the
CAMBIUM of the plant.
What about the last tissue type,
Intercalary?
Where is this tissue found?
This tissue is found at the base of the leaves
or the internodes.
These spaces here are known as the nodes.
What do you think this tissue will do?
They will facilitate the growth of the twigs
into branches.
As these tissues are VERY active,
the cells in these tissues are filled with CYTOPLASM.
They require a lot of energy and nutrition
to carry out the various functions of the tissues.
But do you know something interesting?
At the initial stages, these tissues are not
differentiated into any specific types.
Once they divide and mature after completing
the growth of the plant, their characteristics change.
Then they are differentiated into components
of a single tissue.
Division of labour takes place only after maturity.
Until then, all the meristematic tissues exhibit
the same function of ‘simple growth’ of the plant.
If these are the characteristics of the dividing tissues,
what about the non-dividing tissues?
Let us study them in our next lesson.
関連動画をさらに表示
5.0 / 5 (0 votes)