A tissue consists of cells of only one or several types, having a common origin and performing an identical function (Fig. 98). (a) Meristematic: These are small, thin- walled cells, devoid of any central vacuole and situated at the growing points of stems and root. Their chief function is mitosis. (b) Protective: The cells of these tissues are found on [...]
The following points highlight the four methods of embedding plant tissues in paraffin blocks. The methods are: 1. Fixation 2. Washing 3. Dehydration 4. Infiltration. Method # 1. Fixation: (a) Flower buds: Flower buds of suitable size are rinsed in Carnoy's fluid for 5 sec. and then fixed in Nawaschin's fixative (Belling's modification) for 24 hours. Nawaschin A and B [...]
Here is an experiment to demonstrate osmotic pressure in plant tissues. Theory: The phenomenon 'Osmosis' refers to the movement of water from a solution of higher water potential to one of lower water potential, across a differentially permeable membrane which separates the two solutions. The magnitude of osmotic forces in plant cells and tissues can be estimated in terms of [...]