1. Group presentation My topic:
Experiment to show heat is evolved during germination of seeds.
Experiment to show that root absorbs water
BY: Dawa Tshering

2. Aim of the experiment:
to show that heat is evolved during respiration
Materials required:
Conical flask
Seeds ( about 200 in numbers)
Thermometer
Antiseptic
Grease
Rubber cork
Spirit lamp
Match box
Tripod stand

3. Principles:
germinating seeds produce heat due to respiration.
Procedures:
A day before we soaked collected dried seeds in water to make it wet so that the seeds germinate. (24 hours )
Next day we collected the required materials for the experiment and proceeded with our experiment.
First we divided the seeds into two equal groups and boiled one group of seeds to kill. Then the boiled seeds is washed with antiseptic to prevent from bacterial decay.
After that we named two conical flask “A” and “B”. To conical flask “A” we put live seeds and dead seeds to “B”. To each flask we inserted thermometer each with the cork to make it air tight.
After the set up we left it for observation.

4. Experimental set up

5. After one day Observation: Conical flask “A” Conical flask “B”
Seeds showed germination with increase in temperature.
(initial reading 30°C )
(final reading 39° C)
there was increase in 9° C indicating heat production during germination.
There was no sign of germination.
(final reading 30° C)
there was no rise in temperature indicating no germination.

6. Inference:
Germinating seeds produces heat as a result of respiration.
Precaution
make sure that boiled seeds are dead
take care when handling with glass apparatus
make sure you wash dead seeds with antiseptic to prevent bacterial decay.

7. Aim of the experiment:
to show that roots absorbs water.
Materials required:
Test-tube
Young Leafy shoot with intact root
mustered oil
test-tube stand
Principle:
roots absorbs water and supports the entire plant
Procedure:
we collected the required materials for the experiment
we named two test-tube “P” and “Q” and then filled test-tube “Q” with water and marked the level. To test-tube “p” we inserted leafy shoots with intact roots with same level of water.
after that we put few drops of mustered oil in both test-tube to prevent loss of water by evaporation.

8. Next day Test-tube “P” Test-tube “Q”
then only we placed both the setup in test-tube stand and then left the set up under observation.
Observation
Next day
Test-tube “P”
Test-tube “Q”
There was drastic fall in level of water indicating that roots absorb water which helps the entire plant.
There was little fall in level of water indicating there wasn’t absorption of water in absence of root.

9. Experimental set up

10. be careful when handling with glass apparatus
Inference:
Roots of the plant absorbs water and helps the entire plant.
Precaution
be careful when handling with glass apparatus
make cure that plant taken for the experiment has intact roots

11. Thank You