Third week of our radish observation is almost over. We've already finished some of the experiments and we've started some new ones. Jaś is still interested in growing plants and observing them and that is the most important thing.
DAY 14 - SUNDAY
We were supposed to do this activity on Friday, but somehow the radish did not want to sprout. Today the sprouts were big enough for Jaś to try them.
After cutting the sprout into three parts and trying each part separately, Jaś discovered that the most spicy part is the hypocotyl (the middle part), which later will become the radish that we normally eat.
DAY 15 - MONDAY
GROW, GROW, GROW
We started this experiment last Friday. Now Jaś is supposed to observe the sprouts every day and note their height on a growth graph.
|For the radish to grow better, Jaś had to pull out |
the weaker sprout and leave the stronger one.
Starting new experiment - TOXIC STRESS
In this experiment the radish seeds are being exposed to acid and to salt water. We are now observing how the seeds behave under these conditions, are they going to sprout or not.
DAY 17 - WEDNESDAY
A week ago (on day 9) we started a greenhouse experiment, making predictions on how the radishes from different environments are going to continue to grow. Today we are evaluate these predictions, was Jaś right or not.
DAY 19 - FRIDAY
GROW, GROW, GROW
After five days of observations this is how Jas' radish growth graph:
Jaś made another drawing on the grid, showing how the radish has grown in the past week:
Starting new experiment - GEOTROPISM
In this experiment we are observing how the root and hypocotyl of an upside-down radish seedling reorient in response to gravity. We are also observing positive geotropism (turning towards the earth) and negative geotropism (turning away from the earth).
|We took one seedling from the water jar of |
"toxic stress" experiment and wetted it very well.
|Jaś placed the seedling upside down on the inside wall |
of a jar and traced the seedling's outline onto the tape
on the outside of the jar.
New experiment - HYDROTROPISM
In this experiment we are observing how radish roots grow in response to sudden change in moisture.
Jaś took three more seedlings from the water jar of the "toxic stress" experiment and placed them on the moist paper towel under a plastic wrap.
That was a lot of work for one day :-) .