04:02 Plant tissues are mainly divided into meristematic tissue and permanent tissue. 08:04 Types and functions of parenchyma, cholenchyma, and sclerenchyma tissues in plants. 12:06 Epidermis protects plant parts and facilitates gas exchange and transpiration. 16:08 Epithelial tissue covers organs and cavities, plays a crucial role in regulating the exchange of materials. 20:10 Different types of epithelial tissues - squamous, cuboidal, and columnar, have specific locations and functions in the body. 24:12 Connective Tissues connect different body parts and provide structure 28:14 Connective tissues and muscular tissues in animals. 32:10 Muscular tissue has three types: voluntary, involuntary, and cardiac muscles. Crafted by Merlin AI.04:02 Plant tissues are mainly divided into meristematic tissue and permanent tissue. 08:04 Types and functions of parenchyma, cholenchyma, and sclerenchyma tissues in plants. 12:06 Epidermis protects plant parts and facilitates gas exchange and transpiration. 16:08 Epithelial tissue covers organs and cavities, plays a crucial role in regulating the exchange of materials. 20:10 Different types of epithelial tissues - squamous, cuboidal, and columnar, have specific locations and functions in the body. 24:12 Connective Tissues connect different body parts and provide structure 28:14 Connective tissues and muscular tissues in animals. 32:10 Muscular tissue has three types: voluntary, involuntary, and cardiac muscles. Crafted by Merlin AI.04:02 Plant tissues are mainly divided into meristematic tissue and permanent tissue. 08:04 Types and functions of parenchyma, cholenchyma, and sclerenchyma tissues in plants. 12:06 Epidermis protects plant parts and facilitates gas exchange and transpiration. 16:08 Epithelial tissue covers organs and cavities, plays a crucial role in regulating the exchange of materials. 20:10 Different types of epithelial tissues - squamous, cuboidal, and columnar, have specific locations and functions in the body. 24:12 Connective Tissues connect different body parts and provide structure 28:14 Connective tissues and muscular tissues in animals. 32:10 Muscular tissue has three types: voluntary, involuntary, and cardiac muscles.
Tissues Group of cells having a common origin and similar function are termed as tissues. A. Plant tissues: On the basis of the dividing capacity, plant tissues are of two types: Meristematic tissues Permanent tissues 1. Meristematic tissues: Consist of actively-dividing cells. Meristematic tissues are of three types; Apical meristem: Present at the growing tips of stems and roots. Important function: To increase the length of stems and roots. Intercalary meristem: Present at the base of leaves or internodes. Important function: For the longitudinal growth of plants. Lateral meristem: Present on the lateral sides of the stems and roots. Important function: To increase the thickness of stems and roots. 2. Permanent tissues: Formed from meristematic tissues, the cells in the tissue loose the ability to divider Permanent tissues are divided into two categories: Simple permanent tissue: Consist of only one type of cells. Types of simple permanent tissues: Parenchyma: Composed of unspecialised living cells with relatively thin cell walls, intercellular space, present in soft parts of the plant. Their main function is storage. Collenchyma: Composed of living and elongated cells with cell walls irregularly thickened at the comers. No intercellular space. It provides mechanical support and elasticity to plant. It helps in bending of leaves and stems. Sclerenchyma: Composed of long, narrow, and thick-walled cells. This tissue is made up of dead cells and there are no intercellular spaces. Sclerenchyma cells are dead, present in seeds, nuts, the husk of a coconut, fibres of jute etc. Complex permanent tissue: Made up of more than one type of cells (Conducting tissues.) Types of complex permanent tissues: Xylem: Conducts water and minerals from the roots to the different parts of the plant. Composed of four different types of cells-tracheids, vessels, xylem parenchyma and xylem fibres. Phloem: Conducts food material from the leaves to the different parts of the plant. Composed of four different types of cells-sieve tubes, companion cells, phloem parenchyma and phloem fibres. Protective tissue: It is made of a single layer of cells. E.g., epidermis. The epidermis of the leaf bears stomata. B. Animal tissues: Animal tissues are classified into four types based on the functions they perform: Epithelial Connective Muscular Nervous Epithelial tissues: Form the covering of the external surfaces, internal cavities and organs of the animal body. Various types of epithelial tissues are: Simple squamous epithelium: Single layer of flat cells. Location in the human body: Lining of the mouth, oesophagus, lung, alveoli, etc. Cuboidal epithelium: Consists of cube like cells. Location in the human body: Lining of the kidney tubules and ducts of the salivary glands. It’s function is secretion and absorption. Columnar epithelium: Consists of elongated or column-like cells. Location in the human body: Inner lining of the intestine and gut. Its function is of secretion and absorption. Connective tissues: Specialised to connect various body organs. Various types of connective tissues:, are: Areolar tissue: Found in the skin and muscles, around the blood vessels, nerves, etc. Adipose tissue: Acts as the storage site of fats; found between the internal organs and below the skin; acts as an insulator for the body. Dense regular connective tissue: Main components are tendons and ligaments; tendons connect muscles to bones, while ligaments connect two bones together. Skeletal tissue: Main components of skeletal tissues are cartilage and bone. Fluid tissue: Blood is the vascular tissue present in animals. Muscular tissues: Main function of muscular tissues is to provide movement to the body. Muscular tissues are of three types: Striated muscles or skeletal muscles or voluntary muscles: Cells are cylindrical, unbranched and multinucleate. Smooth muscles or involuntary muscles: Cells are long, spindle-shaped and possess a single nucleus. Cardiac muscles or involuntary muscles: Cells are cylindrical, branched and uninucleate. Nervous tissues: Present in the brain, spinal cord and nerves. Neuron: Cells of the nervous tissue. A neuron: consists of a cell body, an axon and a dendrite.
Meristematic tissues lack vacuous as Meristematic tissues work is to divide not to store materials, whereas vacoules function is to store material and Meristematic tissues are dividing tissues.
My study progress with noting key points{im updating this until i finish the chapter} Day 1 - 9:18 - Complex permanent Tissue Day 2 - 19:58 - Connective Tissues Day 3 - 28:27 - Involuntary Muscles Day 4 - Chapter done 👍
Thank you verryy much.... the explanation was awesome and it helped me a lot for my exams . I was confused and these 32 mins were very helpful.understood the topic now!!
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Locations of Meristematic tissue is classified into apical and lateral and intercallery. Apical meristematic tissue helps in primary growth and lateral helps in secondary growth and intercallery helps in growth of the stem and leaves
2:22 The reason why meristematic cells don't have a vacuole is because the function of a vacuole is storage. These meristematic cells have to constantly divide so that the plant has growth. If the storage of the meristematic cell is more, it makes it harder to divide.
Meristematic tissues are unspecialised cells and dividing cells so they don't need vacuoles . Functions of vacuoles is storage . But meristematic tissues is to divide , show the growth in specific areas
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● The meristematic cells divide frequently and they give rise to new cells. ●For this they require a dense cytoplasm and thin cell wall. ●Vacuoles if present will cause hinderance in cell division as it is full of cell sap to provide turgidity as well as rigidity to the cell. ●Another reason is that the main function of vacoules is to store nutrients , excess salts etc… and meristamatic cells do not need to store these nutrients because of their compact shape.
Meristematic cells are undifferentiated cells found in the growth regions of plants, such as the tips of roots and shoots. These cells are responsible for the plant's primary growth, leading to the formation of new tissues and organs. One characteristic of meristematic cells is their high rate of cell division and rapid growth. Vacuoles are membrane-bound organelles found in the cells of many plants, fungi, and some protists. They play various roles, such as storing nutrients, maintaining turgor pressure, and facilitating cellular processes. However, meristematic cells, being actively dividing and growing, may not have fully developed vacuoles or may lack them altogether. During cell division and rapid growth, meristematic cells prioritize processes such as DNA replication, mitosis, and cell expansion. The limited space within the cell may be occupied by the necessary cellular machinery and structures required for these processes. As cells undergo differentiation and mature into specific cell types, including those involved in storage and support functions, vacuoles become more prominent and take on specific roles in cellular activities. In summary, meristematic cells may not have well-developed vacuoles due to their highly dynamic and actively dividing nature, focusing more on processes related to growth and cell division. Vacuoles become more prominent as cells differentiate and take on specialized functions within the plant.
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Thank u so much sir i was having so many doubts in this chapter but ur explanation made me to understand it very well . Today i have my test so it is helping me to prepare for the test once again thank u sir 🙂
Vacuous job is to store food and nutrients but meristamatic tissues use all the food and nutrients on dividing so they do not need to store food or nutrients in their vacules so no vacules in them 😊
Meristematic cells do not have vacuole as the keep on dividing rapidly. The function of Vacuole is to store food but as meristematics cell divide, they do not need to store food hence they do not have a vacuole.
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2:29 - Meristematic tissues do not have a vacuole as they are actively dividing and vacuoles cause hinderence in cell division , also vacuoles main function is storage but meristematic tissues do not have any substance or material to store.
(Meristematic tissues lack vacuous as Meristematic tissues work is to divide not to store materials, whereas vacoules function is to store material and Meristematic tissues are dividing tissues) le grade booster humse comment badhvane k liye puch rha ha ye main question ha tumhe samjhana chahiye hamesha exams me ata ha
Meristematic tissues lack vacuoles because vacuoles are used for storing materials and they are continuously dividing and they need materials, hence they are very active and so they don’t need vacuoles
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vacuoles provides storage and provides turgidity and rigidity to the cell that's why meristematic tissue don't need it because it's continuously dividing and it will interfere with division but when meristematic starts to turn into permanent tissue it starts to gain vacuoles.
Because meristematuc tissue have to increase their length , growth , girth time to time so they don't have vacuole and they have to divide multiple times
It's because merestematic tissue are capable for growth not for storage vacuole are sac like elemat present inside the cell responsible for storing but merestematic have to divide so it's because
Lack of vacuoles in merisitimatic tissue because the vacuoles functions are storing of food materials but merisitimatic tissue is a growing tissue it helps to divided tissues not to store food materials
Meristematic cell lack vacuole because they are continuously dividing cell and vacuole stores food and they don't need to store food because they divided quickly
The main function of vacuole is to store food since the meristematic cells will be divide continuously and convert into permanent tissue they doesn't require food
Meristematic cells, which are actively dividing cells in plants responsible for growth and development, typically have a limited or small vacuole, or sometimes none at all. This is because vacuoles are often associated with mature and specialized cells, providing structural support, storing nutrients, and participating in various cellular processes. In meristematic cells, the focus is on rapid cell division and differentiation. The lack of a prominent vacuole allows these cells to have more cytoplasm and maintain flexibility for continuous growth and differentiation into different cell types. As cells mature and specialize, they may develop larger vacuoles to serve specific functions within the plant tissue.
The meristimatic tissue has to divide regularly it has a thin cell wall and a dense cytoplasm thus , it is easier for them to divide and it lacks vacuoles.
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