Cell membrane holds the sap inside the tube and pumps sucrose in and out of the sieve tube. They are connective tissues and are found in between skin and muscles. The phloem can be classified into two types that are given below: Primary phloem: It has originated from the procambium which develops as a result of the primary growth of the plant. NCERT Exemplar Class 9 Science Chapter 6 Tissues are part of NCERT Exemplar Class 9 Science. Theory Tissues: A group of cells having similar structure, origin and functions is called a tissue. The epidermis in plants forms an uninterrupted and continuous layer that has no intercellular spaces. Write two differences between striated and smooth muscles. Draw the diagram for each type of epithelial tissue. When the phloem is internal to the secondary xylem, then it will refer as “Inter xylary phloem”. These tissues causes the plant to become stiff and hard. On the other hand, complex tissues are made up of more than one type of cells. 9. It consists of living cells like sieve cells, companion cells, phloem parenchyma and the only dead cell which is phloem fibres. Therefore, phloem helps in the translocation of food from the source (Leaves) which carry out the process of photosynthesis and sinks it to the other parts which are used up for the growth and other activities of the plant. State its function. Phloem parenchyma is used to prepare and store food. The main activity of this tissue is to transport nutrients and food from leaves to other growing parts of plants . Tendon (c) Tissue that transports food in plants. It can refer as modified parenchyma which comprises of dense cytoplasm, cell organelles. Phloem is a complex tissue of a plant which was first introduced by a scientist Nageli in the year 1853. The following are the differences based on cell wall between different tissues: 5. [NCERT Exemplar] Back of Chapter Questions . It is the food conducting tissue of vascular plants. Plasmodesmata: These are the cytoplasmic strands which link the sieve tube and the companion cells. Define the term “tissue”. Let us compare their structure and functions. 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cell that coordinate to perform one particular function, Cell walls are thin and made up of cellulose, Cell walls are thick at the edges due to the deposition of pectin, Cell walls are thick due to the deposition of lignin, Wall of stomach, intestine, ureter and bronchi. 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