11th Class Biology The Living World / जीव जगत

  • question_answer 33)
      How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies?


                      For preservation of plant material on a herbarium sheet the following tools and steps are required to be followed. Tools Digger and pruning knife, sickle with long handle, vasculum, polythene bags, magazines or newspapers, blotting papers, plant press, field notebook, herbarium sheets ,glue, labels, small transparent polythene bags. One can prepare herbarium sheets by cutting papers of size 29x 41.5 cm The preparation of a herbarium specimen required following steps (i) Collection of plant or plant parts. (ii)Pressing It involves the spreading and pressing of collected specimen over a newspaper so as to preserve its all parts. (iii) Drying It involves the drying of the specimen between the folds of newspaper. (iv) Poisoning Antifungal (dipping in 2% ) and pesticidal (DDT) treatment of the dried specimen. (v) Mounting It involves mounting of the specimen over a herbarium sheet. (vi) Labelling and identification of the dried specimen are the last steps, while preparing a herbarium sheet. Tools/equipments required for the collection of herbarium specimens are as follows (i) A tin or aluminium container of 50 x 30 x 15 cm size. (ii) Collection bags/plastic/polythene bags. (iii) Digger for digging roots. (iv) Magnifying lens of at least 10X magnification.                                         . (v) Field note book. A preserved plant material on the herbarium sheet may provide information about the family, genus, species, date of collection, area of collection, etc., for taxonomic studies.

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