Measuring Rate of Rater Uptake by a Leafy Shoot
The water uptake can be measured easily and because very high
proportion of the water taken up by a stem is lost in transpiration,
it enables the rate of transpiration to be measured.
Key Factors to be kept Constant: -
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v Temperature - room temperature (approximately 25ºC)
v Wind speed - No artificial wind was produced to affect results
v Light intensity - Extra light was not used
v Humidity - it was not humid on the day experiments were conducted
The water uptake for the control Experiment.
Time (minutes)
Initial meniscus position of the air bubble (cm)
Final meniscus positionof the air bubble (cm)
Water uptake
(Distance moved) (cm)
Total water uptake (cm)
1
10.0
10.7
0.7
0.7
2
10.7
11.5
0.8
1.5
3
11.5
12.3
0.8
2.3
4
12.3
13.0
0.7
3.0
5
13.0
14.0
1.0
4.0
6
14.0
14.8
0.8
4.8
The water uptake when Vaseline is applied on the top surface of the
leaves.
Time (minutes)
Initial meniscus position of the air bubble (cm)
Final meniscus positionof the air bubble (cm)
Water uptake (Distance moved) (cm)
Total water uptake (cm)
1
6.0
6.6
0.6
0.6
2
6.6
7.2
0.6
1.2
3
7.2
7.9
0.7
1.9
4
7.9
8.5
0.6
2.5
5
8.5
9.2
0.7
3.2
6
9.2
9.7
0.5
3.7
Time (minutes)
Initial meniscus position of the air bubble (cm)
Two members of the group were instructed to visit the laboratory each day of the experiment to water and measure the plants (Handout 1). The measurements that were preformed were to be precise and accurate by the group by organizing a standardized way to measure the plants. The plants were measured from the level of the soil, which was flat throughout all the cups, to the tip of the apical meristems. The leaves were not considered. The watering of the plants took place nearly everyday, except for the times the lab was closed. Respective of cup label, the appropriate drop of solution was added to the plant, at the very tip of the apical meristems.
The problem of water shortage is one of the major limiting factors in food production and agriculture development in the arid and semi arid regions. Reclaimed water is one of the most significant available water resources that shall be consumed in agriculture and urban landscape maintenance. In order to investigate the impact of water quality and its application method on olive trees this experiment was carried out during 2010-2012 in the semiarid central part of Iran on young olive trees. The trees were irrigated by a new subsurface-leaky irrigation (SLI) system and surface irrigation in line with irrigation with recycle and clean water for 24 months. The results revealed that SLI system could enhance trees growth, leaf area, Fv/Fm and photosynthesis by68, 26, 4 and 42% respectively, although it decreased leaves soluble sugars (47%). In addition, irrigating trees by SLI system using reclaimed water could increase N and Mg uptake 138 and 8% respectively. Plants irrigated with RW showed improved growth (42%) leaf area26% and photosynthesis 23.4% compared with CL water. Furthermore Mg, Na, K, P and N surprisingly increase 12, 59, 30, 7, and 92 % respectively in leaf tissue in application recycle water. In overall, this experiment showed that recycled water could be a favorable resource for olive trees irrigation and SLI irrigation system was more efficient in irrigation in this research.
Many variations and species of plants can be found all around the world and in different habitats. These variations and characteristics are due to their adaptations to the natural habitat surrounding them. In three of many climatic zones, the arid, tropical and temperate zone, plants that vary greatly from each other are found in these locations. In this experiment, we’ll be observing the connection between the adaptations of the plants to their environment at the Fullerton Arboretum. The arboretum is a space containing numerous plants from different environments. The plants are carefully looked after and organized into their specific habitat. Therefore, we’ll be able to take a look at the plants within multiple
help give a better idea of how the rate of osmosis is affected by the
Diffusion and osmosis are necessary for the efficient transport of substances in and out of living cells. Diffusion is the most common and effective transportation process between cells and their surroundings, the movement of a substance along a concentration gradient from high to low, allowing essential nutrients and compounds to be transported without expending energy. Osmosis is a special kind of diffusion, specific to water. In order to observe diffusion and osmosis in real and artificial cells, a series of experiments was put together to observe how the surface area to volume ratio effects the rates of diffusion by using agar in different shapes with different ratios, next the rate of diffusion due to tonicity was observed using different solutions with different tonicities. And lastly live plant cells were submerged in different solutions with varying water potentials to observe how was potential effects the rate of osmosis and diffusion. It was concluded that the larger surface area to volume ratio, the faster rate of diffusion, the hypertonic solutions caused water to leave a cell and the hypotonic solutions allowed water to enter a cell, and that water potential will move from high to low in an attempt to maintain equilibrium.
In this experiment I will investigate the affect in which the light intensity will have on a plants photosynthesis process. This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable.
The “Fast Plant” experiment is an observation of a plants growth over the span of twenty-eight days. The objective is to observe how plants grow and use their resources throughout the span of their life. In our lab we observed the Brassica rapa, a herbaceous plant in the mustard family which has a short cycle which makes it a perfect plant to observe in this experiment. Like other plants the Brassica rapa must use the resources in the environment to create energy to complete itʻs life cycle and reproduce. By observing the plant it is easy to see in what organ or function the plant is using itʻs energy and resources and if overtime the resources switch to other part of the plants. By conducting this experiment we are able to observe where and how plants allocate their resources throughout their life by harvesting plants at different points in their life.
For some people irrigation systems may not sound interesting or useful, however; they play a huge role in keeping produce alive and well-watered. Be...
To make the test fair I will use the same amount of water and the leaf
The results verified that the spinach had the highest chloroplasts concentration because it had the absorbency of 0.730, 0.826, 1.011, and 1.049 as shown in Table 1-4. The spinach was our positive control because, from a previous experiment, we knew that it would have chloroplasts; the buffer sucrose was the negative control because if the cabbage or lettuce did not have any contents of chloroplasts, then the readings should be equivalent to the buffer sucrose since it was our blank solution. Therefore, it should read 0.00, if there were no contents of chloroplasts. On the other hand, there was a flux in the data between the cabbage and the lettuce. However, the overall data suggested that the cabbage had a higher content of chloroplasts than
In the light intensity experiment, tubes of buffer solution, chloroplast, water and DPIP were placed in different intensities of light to determine how light intensity affects the reaction rate of photosynthesis. The reaction rate was measured by absorbance values in five-minute increments for 30 minutes. The tubes were placed at 24 cm away, 30 cm away, 49 cm away, and completely dark. The tube that was closest to the light had the smallest absorbance value, while the dark tube had the highest value. As the light intensity increases, the absorbance value decreased. In the action spectrum experiment, 10 aspirated spinach leaves and sodium bicarbonate solution were mixed together in beakers then each beaker was placed in different light boxes.
* Count the number of bubbles seen in 1 minute which is a way of
Tritiated water is a radioactive form of water where the hydrogens have two neutrons instead of zero neutrons found in pure water (McFarlane, Beckert and Brown 1976). Tritiated water acts like solute in the pure water of the xylem; therefore water exchange with cambium occurs and the treated water exits the xylem and enters the cambium via diffusion. Furthermore exchange between the phloem and the cambium occur to further dilute the tritium (Metzner et al. 2010; Klepper, Molz, and Peterson 1973). This exchange of the tritiated water again occurs via diffusion (Metzner et al. 2010; Klepper, Molz, and Peterson 1973). The tritiated water then travels from the phloem back to the roots. When the plant is girdled, the xylem is unable to exchange
2. There is an anomalous result at 100cm. This is so far away from the
Aim: To determine the effect of temperature change on the height of water in capillary action at 8 seconds.