Title Part 3 The Tissue System.pdf ✅

➢ Several tissues may collectively perform the same function ➢ A collection of tissue performing the same function is known as tissue system ➢ On the basis of location, position and structure, Sachs categorised tissues into three types of tissue system
➢ Epidermis forms outermost layer of primary plant body and made up of elongated, compactly arranged cells ➢ Cells of epidermis are parenchymatous and hence they are living ➢ Mostly epidermis is single layered but multiple layered epidermis is also seen in leaves of Nerium, Ficus sp. etc ➢ In multi-layered epidermis of Ficus, certain bunch of grape like structure found called cystolith. Its made up of calcium carbonate crystals. The cells in which cystolith is called lithocyte ➢ Large water filled epidermal cells present in epidermis of monocot leaves are called bulliform or motor cells ➢ These are hygroscopic and help in rolling and unrolling of the leaves EPIDERMAL TISSUE SYSTEM This system includes epidermis and its associated structures I) EPIDERMIS