Response to Stimuli CXC 2014
LAB NUMBER: ______
DATE: 6/12/13
TITLE: Response to Stimuli
AIM: To discover how gravity can effect plant growth
MATERIALS: kidney beans (3) glass cup tissue paper
PROCEDURE:
1. Three kidney beans were placed on some tissue paper soaked in water. They were left for a day.
2. Several layers of tissue paper were placed along the inside of a glass and were soaked in water. The wet tissue stuck on the glass.
3. The germinating beans were gently placed between the glass and the tissue. They were left for a day. The tissue paper was kept moist.
4. A picture of the seedling was taken at the end of one day.
5. The growth of the radicle was recorded.
6. The glass was inverted and left for another day.
7. Further pictures were taken of the seedling.
RESULTS:
PICTURE SHOWING THE RADICLE GROWTH IN THE INVERTED GLASS CUP
DISCUSSION:
The tissue paper was always kept moist throughout the experiment because the seedling needs a continuous supply of water to insure the growing process is successful. The radicle and the shoot did not grow in the same direction because the radicle grows by geotropism and the shoot grows by phototropism. Also influencing the growing process was the presence of the growth hormone, auxin. By inverting the glass cup, the seedling slightly shifted in position. In further explanation, by inverting the glass cup, the shoot grew upwards, towards the light, and the radical grew towards the ground, downwards. This was made possible by the auxin. In the shoot, the auxin, which stunts the growth of the shoot, accumulates in the region shaded away from the sunlight. Therefore, the shaded region grew while the growth of the region exposed to light was stunted. In reference to the effect of auxin in the radicle, growing occurs at the tip of the root because this is where the auxin accumulates. The auxin plays the opposite role in the effect of growth in the radicle because in this case the auxin
DATE: 6/12/13
TITLE: Response to Stimuli
AIM: To discover how gravity can effect plant growth
MATERIALS: kidney beans (3) glass cup tissue paper
PROCEDURE:
1. Three kidney beans were placed on some tissue paper soaked in water. They were left for a day.
2. Several layers of tissue paper were placed along the inside of a glass and were soaked in water. The wet tissue stuck on the glass.
3. The germinating beans were gently placed between the glass and the tissue. They were left for a day. The tissue paper was kept moist.
4. A picture of the seedling was taken at the end of one day.
5. The growth of the radicle was recorded.
6. The glass was inverted and left for another day.
7. Further pictures were taken of the seedling.
RESULTS:
PICTURE SHOWING THE RADICLE GROWTH IN THE INVERTED GLASS CUP
DISCUSSION:
The tissue paper was always kept moist throughout the experiment because the seedling needs a continuous supply of water to insure the growing process is successful. The radicle and the shoot did not grow in the same direction because the radicle grows by geotropism and the shoot grows by phototropism. Also influencing the growing process was the presence of the growth hormone, auxin. By inverting the glass cup, the seedling slightly shifted in position. In further explanation, by inverting the glass cup, the shoot grew upwards, towards the light, and the radical grew towards the ground, downwards. This was made possible by the auxin. In the shoot, the auxin, which stunts the growth of the shoot, accumulates in the region shaded away from the sunlight. Therefore, the shaded region grew while the growth of the region exposed to light was stunted. In reference to the effect of auxin in the radicle, growing occurs at the tip of the root because this is where the auxin accumulates. The auxin plays the opposite role in the effect of growth in the radicle because in this case the auxin