Page 81 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS
P. 81

LAB ACTIVITIES

                   9. XYLEM IS WATER CONDUCTING TISSUE IN PLANTS                        10. SHOOTS SHOWS PHOTOTROPISM/ROOTS - GEOTROPISM

                  AIM                                                                      AIM:  To prove that shoots / plants shows phototropism.
                     To observe the path of water through a plant.                                 To prove that roots shows geotropism.
                                                                            original preparation  APPARATUS
                  APPARATUS                                                    lab activity        Potted plant
                                                                               pl. scan QR
                     1.  Balsam plant     2. Beaker      3. Microscope                     DIAGRAM
                                                                                   RAJU’S NATURAL SCIENCE ACADEMY
                     4.  Eosine solution  5. Stand       6. Blade
                  DIAGRAM










                                                                                           PROCEDURE
                                                                                              1. Take a potted plant.
                                                                                              2. Break the lower part of the pot carefully.
                  PROCEDURE                                                                   3. Turn the pot and place it
                     1. A leafy green shoot of Balsam plant with a transparent stem is             horizontally.
                  placed in Eosine solution. [It is red dye resulting from the action of bromine]  4. Observe the growth of roots
                     2. After sometime red streaks appear in the stem and veins of leaves         and shoots after a week.
                  become red.                                                              OBSERVATION
                  OBSERVATION                                                                 1. Shoots grow towards light.
                     1. If a transverse section is cut through the root stem and leaves, the  2. Roots grow towards the soil.
                  tissue that has been stained in xylem tissue.                            INFERENCE
                     2. This shows that water moves up the root into the stem and leaves      This experiment shows phototropism in shoots and geotropism in roots.
                  in the xylem tracheids and vessels.                                      PRECAUTIONS
                  INFERENCE
                                                                                              1. We should remove the bottom of the pot without damaging the roots.
                     1. The xylem tissue is the tissue responsible for the movement of
                                                                                              2. Keep stones besides the pot for prevent rolling of pot.
                  water through the plant.

                TEACHER AND  STUDENT  PUBLICATIONS,  ONLY  10TH  CLASS             (116)                           DIGITAL BOOKS (ONLINE&OFFLINE), ALL SUBJECTS (TM&EM) 9885678410
   76   77   78   79   80   81   82   83   84   85   86