Page 82 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

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.

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