·         Meristematic Tissue (Cells are capable of division) §  A meristematic tissue (meristos = divisible) is a group of identical cells that are in a continuous state of division  §  Some cells produced by meristematic tissue stop dividing and acquire certain changes (differentiation) to become permanent tissues of the plant ·         Based on location on the plant, the meristem is ...

·         A plant tissue may be defined as a group of cells, which are similar in origin, form and function or as a group of dissimilar cells that perform a common function. E.g. phloem elements conduct food The simple type of plant body is unicellular, in such form; the single cell performs all the vital functions of life. It grows, ...

·         The plant cell wall is heterogeneous structure composed of layers (lamellae) §  Each cell secretes its own wall §  Junction between the walls is the Middle lamella §  Cell wall is penetrated by plasmodesmataconnecting neighbouring cells §  Cell walls are primarily composed of sugar polymers i.e. polysaccharides §  The architecture, mechanics, and function of plants depend crucially on structure ...

·         The Nucleus §  Spherical body containing a nucleolus §  Surrounded by the nuclear membrane §  Contains DNA (genetic material in chromosomes) ·         Nucleolus §  An organelle within the nucleus where ribosomal RNA is produced §  It controls many of the functions of the cell (by controlling protein synthesis) ·         Centrosome §  It is a small body located near the ...

·         A plant cell is the structural unit of the plant body ·         The plant cells consist of internal and external structures ·         The internal structures (organelles) include; §  The Nucleus §  Nucleolus §  Centrosome §  Ribosomes §  Rough Endoplasmic Reticulum §  Smooth Endoplasmic Reticulum §  Golgi Complex (Golgi apparatus or Golgi body) §  Mitochondria §  Plastids ...

·         As medicines for the treatment of a wide range of diseases, e.g. morphine, atropine, digoxin, hormones, antibiotics ·         As pharmaceutical aids in pharmaceutical industry e.g. suspending & emulsifying agents, suppository bases, binders, sweetening and colouring agents ·         In cosmetics as flavouring and colouring agents ·         In culture media for the propagation of microorganisms in microbiology laboratories & biotechnology. General ...

·        Pharmacognosy is a science which deals with the study of crude medicine (or unprepared form) in substances obtained originally from natural sources mainly plant, animal and minerals  ·         The word Pharmacognosy is derived from the Greek words §  “Pharmakon”, meaning a drug or medicine and §  “gignosco” meaning to acquire a knowledge of ·         It deals with scientific study of ...

error: