Investigating the Relationship Between the Transpiration Rate of a Shoot and the Degree of Opening of the Stomata of Its Leaves
I will be investigating the relationship between the transpiration
rate of a shoot and the degree of opening of the stomata of its
leaves.
Transpiration is the loss of water vapour from the surfaces of a
plant. Solar energy turns the water in the plants into a vapour
causing it to evaporate into the leafÂ’s internal air spaces before
diffusing out of the stomata into the air. The water is able to
evaporate out of the leaf as the leaf has a high water potential and
the surrounding has a low water potential. The water molecules pass
down the concentration gradient from the spongy and palisade mesophyll
cells into the leafÂ’s internal air spaces before diffusing out into
the air.
For this experiment, I will need to vary a factor that affects both
the transpiration rate and the degree of stomata opening in order to
determine the relationship. Factors that affect transpiration rate
are humidity, temperature, light intensity, water supply, plant
surface area, plant species and wind speed. These in fact affect both
incidents because transpiration rate depends upon stomata opening to
allow gas exchange. Using the apparatus available in a school
laboratory, I will determine the relationship by varying the wind
speeds, hence, keeping all the other variables mentioned above
constant. The reason for choosing wind speed is because none of the
other factors can be kept mutually variable for reasonable results
(i.e. if light intensity is chosen as a variable, the temperature will
fluctuate as well).
In the control test where there will be no wind, water vapour will be
able to build up in the air spaces of the leaf and form a layer around
the leaf as water transpires out. This will reduce the water
potential gradient between the inside and outside of the leaf. This
will in turn reduce the rate of transpiration.
4c. The functional significance of the response of elaters to moisture is that they help disperse spores by twisting.
They are used to produce glucose which is used as plant food and growing materials (e.g. cellulose).A leaf which is exposed to plenty of light will have sufficient amounts of food and will not need an excessive amount of chlorophyll. This enables the leaf to have a small surface area. It is also necessary for leaves in areas of high light intensity, and thus high temperature, to have small leaves to reduce the amount of transpiration. The heat will cause water to evaporate a lot faster. Leaves in shaded areas will need a large surface area full of chlorophyll to collect as much sun light as possible; essential for survival.
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
Plasmolysis However when the plant cell is placed in a more concentrated solution the water inside the cell passes out the cell. The cytoplasm... ... middle of paper ... ...
An Analysis and Evaluation of Data from Photosynthesis Experiments Graph analysis This is my analysis for the investigation in to the affect of light intensity on the rate of photosynthesis to the Canadian pondweed, elodea. In the results the pattern is that when the light intensity is higher the readings are generally higher. On the graph the less the light intensity the lower the gradient of the curve. the equation for the photosynthesis process is; CO2 + 2H2O + Light Energy = =
which make up the sweat glands in the skin and the mucus also lines the passageway inside the lungs,
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.
...hroughout the Eelgrass. Excess water in the form of vapor is disposed of through stomata on the leaves. The gas exchange, root, and shoot systems are used in this exchange because the stomata release the excess water in the form of water vapor, which was first absorbed by the roots in the root system, then transported through the xylem in the shoot system throughout the eelgrass. Another exchange that goes on in Eelgrass is nutrients to plant cells. Again the gas exchange, root, and shoot systems are used. Nutrients are absorbed by the roots and made through photosynthesis; stomata take in carbon dioxide which is used along with light, water, and other nutrients previously stored to make more. Nutrients are carried throughout the plant to plant cells by the phloem. Homeostasis is the balance of systems in organisms and it’s very important to keep them in balance.
How Light Affects the Stomatal Opening in a Leaf Abstract = == == ==
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.
Plants also had to adapt on the surface in order to survive the climate change of moving onto land. The changes made to the surface of plants are most closely observed by their formation of a cuticular wax. This waxy cuticle is impermeable to water and acts as a method of controlling plant’s water intake. It can be made thinner or thicker depending on the plant’s needs and the environment at the time, changing in response to droughts or excessive amounts of rain.
Despite the endless years of wear and tear, the school playground is as bustling as it once was. The sounds of giggles and shouting echoed through the school. The aged swings creaked and the see saws squeaked. Without a single care in the world, bright eyed children laughed and played. But far in the back, a little girl rubbed her cloudy blue eyes, as tears streamed down her face.
All vascular plants have roots, which are multicellular organs used to secure the plant in the soil and absorb water and nutrients. (Campbell, Reece, Urry, Cain, Qasserman, Minorsky & Jackson, 2008) The root also stores carbohydrates, which is a product used in photosynthesis. (Whiting, D., 2011) The root has a root cap at the tip of the root to protect the apical meristem, which is a tissue in control of the root’s growth. Although it is not visible to the naked eye, the root cap benefits the root greatly. (New World Encyclopedia Contributors, 2004) It generates a greasy substance that acts like a lubricant for the root so that it can move through the soil more easily. The outer layer of the cells is called the epidermis, (Whiting, D., 2011) which forms from matured dermal tissue. The root develops root hairs from the epidermis, which allow the plant to absorb even more water and minerals. (Allen, K. Z., Armstrong, D. M., Bogin, B., Chubb, C., Culp, L., Cunningham, C. J… Wartski, L. M., 2002)
the cell make sure the water only flows up the plant, this is known as
An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis. Introduction Photosynthetics take place in the chloroplasts of green plant cells. It can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: [ IMAGE ] 6CO 2 + 6H20 C 6 H12 O 6 + 6O2 It has been proven many times that plants need light to be able to photosynthesize, so you can say that without light the plant would neither photosynthesize nor survive.