SCIENCE.pptxkjbjnvnbvjhkvfgcjgjfhcj,jhcjhmjh

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1. SCIENCE ASSIGNMENT PLANT TISSUE BY NAVIN KUMAR GRADE IX

2. WHAT IS PLANT TISSUE ? Plant tissues are  composed of cells that are similar and perform a specific function . Together, tissue types combine to form organs. Each organ itself is also specific for a particular function. Plant tissue systems fall into one of two general types: meristematic tissue, and permanent (or non-meristematic)

3. MERISTEMATIC TISSUE Meristematic tissue  contains undifferentiated cells, which are the building blocks of the specialized plant structures . Meristematic tissues contain living cells with varied shapes. They possess a large nucleus devoid of the vacuole. The cells have no intercellular space.

4. APICAL MERISTEM Apical meristem: These meristems are  present at the tip regions of root, shoot, and leaves . They are the active regions in the cell division which helps in the growth and the elongation of root and shoot. It gives rise to new leaves and hence these are referred as primary tissues in the plant growth.

5. INTERCALARY MERISTEM Intercalary meristem is  a type of primary meristematic tissue containing cells that can divide and promote the growth of the plant . They are located at the base of internodes. The function of the intercalary meristem is to promote the lengthening of the stem and increase the height of the plant .

6. LATERAL MERISTEM It is  located in the stems and roots on the lateral side . It increases the thickness of the plant. Vascular cambium and cork cambium are the two lateral meristems. These divide preclinically or radially and give rise to secondary permanent tissues

7. PERMANENT TISSUE Permanent tissues are  made of meristematic cells, that has definite form and shape and have lost the power to divide and differentiate and are of three types- simple, complex and special . The simple tissues are parenchyma, sclerenchyma and collenchyma. Chlorenchyma is a parenchyma, having chloroplast

8. PARENCHYMA Parenchyma Tissue. Parenchyma is  a type of simple permanent tissue that makes a major part of ground tissues in plants, where other tissues like vascular tissues are embedded . They are non-vascular and composed of simple, living and undifferentiated cells, which are modified to perform various functions

9. CHLORENCHYMA A type of parenchymatous tissue that contains chlorophyll  is known as chlorenchyma. It assists plants in performing their photosynthetic function. It can be found below the epidermis on the leaf stalks

10. AERNCHYMA It is  modified parenchymatous tissue . It is characterized by wide intracellular air gaps found in aquatic plants, which enables gaseous exchange and maintains buoyancy. Aerenchyma are found in Hydrilla, Lotus, Eichhornia, Vallisneria, etc.

11. COLLENCHYMA Collenchyma is  a cellular tissue that, along with parenchyma, composes the bulk of plant tissues . Like parenchyma, collenchyma cells are living cells. They have cellulose cell walls and are filled with water – which helps the plants to keep their shape

12. SCLERENCHYMA Sclerenchyma cells are  elongated, dead cells with lignin deposits in their cell wall . They have no intercellular gaps. Sclerenchyma is found in the covering of seeds and nuts, around the vascular tissues in stems and in the veins of leaves. Sclerenchyma provides strength to the plant.

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