Are there more stomata per mm2 on old leaves or young leaves Essays

Are there more stomata per mm2 on old leaves or young leaves Essays Are there more stomata per mm2 on old leaves or young leaves Essay Are there more stomata per mm2 on old leaves or young leaves Essay I will take some old leaves and some young leaves. I aim to use three of each. I think this is a realistic amount to use because it is a slow process. The leaves I will use will be from a cherry laurel bush (prunus laurocerasus). I will know which leaves are young and which are old by their colour and size. Young leaves are small and a lighter green. Old leaves are larger, and a darker green. First, I will clean the leaf, to remove dust and dirt. Then I will paint 1cm2 of clear nail-varnish on the underside of the leaf, because that is where the stomata are. I will paint the nail-varnish to one side of the mid-rib, but not too near the edge.I will then leave it to dry, while I measure the size of the microscopes field of view, on medium power. To do this, I will use the graticule to measure its diameter, then divide this in half to find the radius. Then I will use the radius measurement in the formula ?r2 to work out the area of the field of view. When the nai l-varnish is fully dry, I will carefully peel it off with a pair of forceps, and place it on a slide the same way up as it was on the leaf. Then I will look at it under the microscope. It will be a perfect imprint of the underside of the leaf. I will count the number of stomata I can see in the field of view, and use the area of the field of view to work out how many stomata there are per mm2. I will repeat this process with all of the leaves.Controls and variablesThe only variable in my experiment will be the age of the leaf. I will try to ensure that all the other conditions remain the same.* I will make sure that all the young leaves are the same size, and all the old leaves are the same size. This will mean that there will not be a range of ages.* I will put the nail varnish on the same part of the leaf, as the number of stomata may vary, according to where they are on the leaf.* I will keep the same nail varnish at the same thickness, so they all peel off in the same way.* I wi ll always use the same magnification medium power, so that the field of view will remain constant.* I will choose leaves from the same side of the same bush, so that all the leaves will have developed in the same conditions.* I will not distort the nail-varnish peel by pressing down on it, changing the results.PredictionI think that age does not affect the amount of stomata on a leaf because of the way in which leaves grow. New leaf cells develop around the edges of the leaf in meristem tissues, the cells of which are able to divide infinitely. After division is complete, genetic programming determines what sort of cell it will become. As a result, whether a cell becomes the one of a stomatas guard cells or not, and the frequency at which they develop is already fixed by the plants genetic programming, which does not change. Therefore, the number of stomata a leaf has per mm2 will remain constant throughout its existence, regardless of its age.Obtaining ResultsWhen I chose my three young leaves, I made sure that they were the smallest leaves I could find. They were all of a very similar size on average 5cm long, and of a light green colour. The three older leaves were all much larger on average 15cm long and of a darker green colour. I collected all the leaves from the same side of the same bush, and at the same height to ensure that they had all grown in the identical conditions. When I took them back to the laboratory, I painted them all with the same brand of nail-varnish, of an equal thickness and area, and in the same position, on the underside of the leaf, where the stomata are.I left them all to dry for 24 hours. While they were drying, I measured my field of view. I set the microscope to medium power, with the x10 eyepiece, then noted which microscope I was using, and the settings, so that they would always be the same. Then using a graticule, I measured the diameter of the field of view. It was 0.6mm long. Then I divided this by 2 to find the radiu s, and used it in the formula ?r2, to calculate the area: ? x 0.32 = 0.283mm2When the nail varnish was dry, I used a pair of forceps to peel the nail varnish off the leaves. Each time, I peeled a section off, I placed it on a clean slide, and labelled the slide to show whether it was a young leaf or an old leaf. When all the nail-varnish had been peeled off and put on slides, I started to make my observations. I placed a slide under the microscope, focused on the image and counted the stomata I could see. As well as counting the full ones, I also counted the ones that were only partially in the field of view. I counted them slowly and accurately, then wrote down my findings. Then I worked out how many there would be per mm2 for each result. To do this I worked out how much smaller my field of view was in proportion to a mm2:1 à ¯Ã‚ ¿Ã‚ ½ 0.283 = 3.53This meant that I had to multiply each of my results by 3.53 to obtain the number of stomata per mm2. I put these results into a table :Old LeavesYoung LeavesNumber of stomata per mm2204.9129.7190.8188.7130.7159.6I thought these results looked quite random, so I decided to look at some more leaves. I prepared them in exactly the same way as I had done before: The leaves were of the same size, colour, and position on the same bush. I used the same thickness, area and brand of nail-varnish in the same position on the underside of the leaf, and left them for the same amount of time. When I made observations, I used the same microscope, power and eyepiece as I had done the first time. I counted the stomata in the same way as I had done before, and worked out the calculations in the same way. However, I only had time to do two more young and old leaves. I added these results to the table:Old LeavesYoung LeavesNumber of stomata per mm2204.9129.7190.8188.7130.7159.6141.3166.7159.0156.1Average165.3160.2AnalysingMy results indicate that the number of stomata varies from leaf to leaf, but when the mean is compared between ol d and young leaves the results are very similar they only differ by 3%, or 5 stomata. This suggests that the age does not affect the number of stomata per mm2 on a leaf. This is a graph of my results:My findings support my prediction because they prove that age does not affect on the amount of stomata per mm2 that a plant has. I think this is due to the way in which leaves grow. New leaf cells develop around the edges of the leaf in meristem tissues, the cells of which are able to divide infinitely. After division is complete, genetic programming determines what sort of cell it will become. As a result, whether a cell becomes the one of a stomatas guard cells or not, and the frequency at which they develop is already fixed by the plants genetic programming, which does not change. Therefore, the number of stomata a leaf has per mm2 will remain constant throughout its existence, regardless of its age. The number of stomata may vary from leaf to leaf due to differences in the stomatas positioning on the leaf.EvaluatingI think that the evidence I obtained is as accurate as I could make it. The observations I made are quite accurate, because I counted the stomata as well as I could, but, due to slight imperfections on the surface of the nail-varnish, some small parts were not in focus. This meant that in these parts the stomata were difficult to count. However, I do not think that I made any major mistakes. I do not think that there are any anomalous results. The procedure was very suitable, because using a nail-varnish peel is the only way to count the stomata with the equipment that I had access to. The microscope I used relied on light shining through the specimen, and it is impossible to look at leaves in this way due to their thickness. The reliability if my evidence could have been improved by obtaining more results.If I had looked at more leaves, then I would have been able to calculate more accurate averages. Also, I should have ensured that I always looke d at exactly the same part of the leaf, as precisely as possible, in case the number of stomata per mm2 varied greatly depending on where it was on the leaf. I always painted my nail-varnish in about the same place, over an area of 1cm, but my microscope was only able to look at 0.283mm2. This means that the particular place on the leaf that I looked at could have varied enormously from leaf to leaf. I think my evidence is sufficient to support a firm conclusion, because, despite the fact that I only did 5 of each different age, they still showed that age does not seem to have an effect on the number of stomata per mm2 a leaf has. However, I think that there is a way that I could have provided additional evidence for a conclusion.The best way to discover whether age affects the number of stomata per mm2 that a leaf has would be to look at the same leaf as it matures. I could have left the leaf growing on the tree, and painted the nail-varnish on without taking the leaf off the tree, then taken the dry nail-varnish peel back to the laboratory to observe. I could have marked where I had painted the nail-varnish the last time, and each month, I could have repeated the experiment, comparing it to the last result I had got. This way I would know for sure how age affects the stomata, because I would be looking at the same leaf as it grew in the same conditions, rather that different leaves, growing in slightly different conditions. Also, when I drew a graph of my results, the data would be continuous, allowing me plot a line graph and discover the true relationship between the age of a leaf and the amount of stomata it has.

Spiny Lobster (Rock Lobster) Facts

Spiny Lobster (Rock Lobster) Facts A spiny lobster is any lobster in the family Palinuridae, which includes at least 60 species. These species are grouped into 12 genera, which include Palinurus, Panulirus, Linuparus, and Nupalirus (word play on the family name). There are numerous names for the spiny lobster. Commonly-used names include the rock lobster, langouste, or langusta. It is also sometimes called a crayfish or crawfish, even though these terms also refer to a separate freshwater animal. Fast Facts: Spiny Lobster Scientific Name: Family Palinuridae (e.g. Panulirus interruptus)Other Names: Rock lobster, langouste, langusta, sea crayfish, furry lobsterDistinguishing Features: Shaped like a true lobster, but has long, spiny antennae and lacks large clawsAverage Size: 60 cm (24 in)Diet: OmnivorousLife Span: 50 years or moreHabitat: Tropical oceans worldwideConservation Status: Depends on speciesKingdom: AnimaliaPhylum: ArthropodaSubphylum: CrustaceaClass: MalacostracaOrder: DecapodaFun Fact: Spiny lobsters make a rasping sound using friction at the base of their antennae. Description The spiny lobster resembles a true lobster in its shape and hard exoskeleton, but the two types of crustacean arent closely related. Unlike true lobsters, spiny lobsters have extremely long, thick, spiny antennae. They also lack large claws or chelae, although mature female spiny lobsters have a small claw on their fifth pair of walking legs. The average size of a mature spiny lobster depends on its species, but they may exceed 60 centimeters or 2 feet in length. Specimens of many spiny lobster species are red or brown, but some spiny lobsters have mottled patterns and display vivid colors. Some species of spiny lobster are colorful. DigiPub / Getty Images Distribution Spiny lobsters live in tropical oceans worldwide. However, they are most commonly found in the Caribbean and Mediterranean, in coastal waters off Southeast Asia and Australia, and off the coast of South Africa. Behavior The spiny lobster spends most of its time hidden within a rocky crevice or reef, exiting at night to feed and migrate. During migration, groups of up to 50 spin lobsters move in single file, keeping contact with each other with their antennae. They navigate using scent and taste, as well as through their ability to detect the Earths magnetic field. Reproduction and Life Cycle Spiny lobsters reach sexual maturity when they reach the necessary size, which depends on water temperature and food availability. The average age of maturity is between 5 and 9 years for females and 3 and 6 years for males. During mating, males transfer spermatophores directly into the females sternum. The female spiny lobster carries 120,000 to 680,000 fertilized eggs on her pleopods for around 10 weeks until they hatch. Juvenile painted spiny lobster. Hal Beral / Getty Images Spiny lobster larvae are zooplankton that do not resemble adults. The larvae feed on plankton and go through several molts and larval stages. In the case of the California spiny lobster, 10 molts and larval stages take place between hatching and reaching the juvenile form. Juveniles sink to the bottom of the ocean, where they eat small crabs, amphipods, and isopods until they are big enough to take larger prey. It is difficult to gauge the age of a spiny lobster because it gains a new exoskeleton each time it molts, but the animals lifespan is believed to be 50 years or more. Diet and Predators Spiny lobsters are omnivorous, eating live prey, decaying matter, and plants. During the day, they stay hidden in crevices, but at night they may venture from crevices to hunt. Typical prey include sea urchins, snails, crabs, sea hares, mussels, and clams. Spiny lobsters have not been observed eating other members of their own species. The crustaceans navigate and hunt using senses of smell and taste. Humans are the spiny lobsters most significant predator, as the animals are fished for meat. The spiny lobsters natural predators include sea otters, octopuses, sharks, and bony fishes. Sound When threatened by a predator, the spiny lobster flexes its tail to escape backwards and emits a loud rasping sound. The sound is produced using a stick-slip method, like a violin. The sound emanates when the base of the antennae rubs across a file on the antennal plate. Interestingly, the spiny lobster can make this sound even after it molts and its shell is soft. While some insects (e.g. grasshoppers and crickets) produce sounds in a similar fashion, the spiny lobsters specific method is unique. Conservation Status For most spiny lobster species, there is is insufficient data for conservation status classification. Of the species listed on the IUCN Red List, most are categorized as least concern. However, the common spiny lobster (Palinurus elephas) is vulnerable with a decreasing population. The Cape Verde spiny lobster (Palinurus charlestoni) is near threatened. The most significant threat to spiny lobsters is over-exploitation by fisheries. Climate change and single catastrophic events also threaten some species, particularly if they live within a restricted range. Sources Hayward, P. J. and J. S. Ryland (1996). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. p. 430. ISBN 0-19-854055-8.Lipcius, R. N. and D. B. Eggleston (2000). Introduction: Ecology and fishery biology of spiny lobsters. In Bruce F. Phillips J. Kittaka. Spiny Lobsters: Fisheries and Culture (2nd ed.). John Wiley Sons. pp. 1–42. ISBN 978-0-85238-264-6.Patek, S. N. and J. E. Baio (2007). The acoustic mechanics of stick-slip friction in the California spiny lobster (Panulirus interruptus). Journal of Experimental Biology. 210 (20): 3538–3546. doi:10.1242/jeb.009084Sims, Harold W. Jr. (1965). Lets call the spiny lobster spiny lobster. Crustaceana. 8 (1): 109–110. doi:10.1163/156854065X00613

Levandary cafe case Study Example | Topics and Well Written Essays - 750 words

Levandary cafe - Case Study Example This was mainly in terms of design of the store as well as menu selection. Because of this, it is paramount for Foster to get more involved in the China’s business and strategic plan for effective adoption and ensure expansion in this region. Louis Chen is a self-driven CEO in charge of lavendary China but he faces immense resistance and negative attitude towards both the firm’s planning and reporting processes. This has yielded too many concerns among the Lavendary management thus there is a need for Foster to travel to China. This is to address varied and emerging management issues cited above. Mia Foster can opt to hire an international financial analyst for the Denver team- This is important though expensive to enable the use of the Generally Accepted Accounting Principles (GAAP). Hence, ensure the sustainability of the china business as it grows. Reduce the freedom given to Louis Chen through obtaining more information about the China operations and involving the home office in these operations. In addition, the Involvement of Mia foster in the china business plan will help in ensuring that Chen does not go too offline with his agendas. My recommendation encompasses reducing the extra freedom given to Louis Chen that he acquired from Howard. This will allow the management in the US to be involved in all the discussion concerning the China operations. This way, Chen cannot work on his authority alone and hence major design and menu selection alterations can only be approved by the management in the US. The management can also easily compel Chen’s team to use the standard reporting procedures used in the US. If this happens, a lot of costs will be reduced. Using the accepted standards will also make the audit much easier hence enhancing the business integrity. Critics may argue that cutting down the freedom of Louis Chen is not

Human Resource - Best Company to Work for Research Paper

Human Resource - Best Company to Work for - Research Paper Example Companies which are considered best to work with are those in which their human resource practices are fair, equal to all and that they acknowledge employees as important asset as well as resource to the company (Google company 2012). Human resource practices is used widely in the measurement in which company an employee can work best with, these practices are useful in addressing various issues affecting employees in the workplace. Companies considered best to work with have best human resource practices and policies that treat employees equally and fairly, these practices are available on demand to respond to specific situations. These human resource practices generally ensure that there is positive working environment which promote good working relationship and improved productivity. Such companies are considered best to work with because it ensures that employees are able to understand their employment terms, benefits and salaries thus there is minimal employer and employee conflicts within the company. Google Company is among the top companies which are considered to have the best human resource practices thus the best company most of the employees would like to work with. The ranking of Google Company as the best company to work with is based on the adoption of the various human resource practices that addresses to a larger extent the issues concerning the welfare of the employees both in the workplace and outside. The success of Google Company has been greatly linked with these human resource aspects which are the key factors to the increased productivity of its employees (Google company 2012). These aspects of human resource practices which have been adopted by Google Company include the following. The approach in which Google Company uses in the recruitment process is that the human resource department directly manages and carries out all the recruitment and the selection process of the new employees. In the final stages in ensuring

Entrepreneurship choose one of two questions to write ) Essay

Entrepreneurship choose one of two questions to write ) - Essay Example They also take risks and engage other individuals in implementing ideas. The individuals who develop such ideas posses appropriate characteristics and behaviours for the development and success of a business. These qualities range from creativity, persistent, risk-taking, influence, time management and leadership qualities. An entrepreneur is responsible for the success of the business and any failures result to business closure or a reduction in profits. Various theories and laws define entrepreneurship in the economic world (Bygrave and Zacharakis, 2010). The resonant alternative entrepreneurship theories explain its various aspects including uniqueness, personality, and creativity. The alternative theories are also useful in explaining various elements that facilitate effective business development. The alternate arguments for entrepreneurship describe entrepreneurs and their involvement in business development. The theories focus on either individual entrepreneurs or recognition of opportunities. Most of the alternative assumptions reflect essential entrepreneurial phenomena such as the entrepreneur, the decision-making process and the nature of business opportunities (Alvarez, 2005). The alternative approach to entrepreneurship is an excellent avenue to establishing various elements regarding innovation and contemporary entrepreneurship. They are further useful in explaining the development of successful entrepreneurship characteristics. The alternative theories explain how the uniqueness of entrepreneurs influences their success in implementing business ideas. The applications and the impact of these theories reflect on the individual characteristics of entrepreneurs. The entrepreneurship alternative theories include the discovery and the creative theories (Bygrave and Zacharakis, 2010). The discovery theory entails discovery, existence and exploitation of opportunities, and individual influence. The theory comprises of three different

Unstructured interviews to investigate violent crime Essay Example for Free

Unstructured interviews to investigate violent crime Essay Assess the strengths and weaknesses of using unstructured interviews to investigate violent crime. (15 marks) Violent crime is difficult to study in the context where it occurs; this is because by their nature, violent crimes are often swift and unexpected. It is very difficult, if not impossible, for a researcher to know when and where a violent crime is likely to be committed. Unstructured interviews are a research method which entails a sociologist asking participants a series of open-ended questions in an unstructured format. This method has both strengths and weaknesses, but is overall preferred by interpretivists as it provided qualitative data and is highly valid. This method is highly valid as it uses open-ended questions which allow for follow up questions to be asked. There aren’t any pre-set questions on the topic; the participant’s answer to a question determines what is asked next. This means that participants are more likely to answer questions about violent crime and they will be more inclined to give in depth answers which can be used to paint a true to life picture. However, unstructured interviews lack reliability, this is because they aren’t standardised. As the questions are created based on previous answers, no two people will have the same interview; they also cannot be repeated as it is unlikely that someone will provide the same answers on separate occasions. Also victims of violent crime are likely to answer differently to perpetrators as they have different experiences, for example, in cases of domestic violence. Another issue is representativeness as unstructured interviews are very time consuming, sociologists can only focus on small groups of people. Also as they are so personalised, they may not be representative of all who have a connection with violent crime. A factor in unstructured interviews is the interviewee’s view; participants can speak freely about themselves due to the fact that there are not set questions. The greater freedom allows the participant to bring in new ideas about themselves and what they have experienced within violent crime. One problem found with using interviews to study violent crime, is that victims are less likely to agree to participate, especially if the violence was recent (Crawford et al, 1990). Aldo investigating the perpetrators of violent crime after the event raises problems of cooperati on, memory and ethics. Unstructured interviews allow for the interviewer to form a rapport with the person being studied.

The Otaku :: essays research papers fc

The Otaku More and more we, as Americans are seeing other cultures intertwine with our own. With the introduction of TV, satellite and Internet it’s easy to find out more about a specific area in the world. Watching and reading about another culture you almost might make you obsessed with it. An Otaku is one such person. Otaku is a term common with people who make a hobby out of watching Japanese animation or anime for short. Most of these people who watch the anime are regular people that go to work or school and need something to relax with. An Otaku, on the other hand is a person that obsesses over anime. â€Å"An otaku is an obsessive fan of any one particular theme, topic, or hobby. Perhaps the most common uses are anime otaku (who sometimes enjoy many days of excessive anime watching with no rest) and manga otaku (Japanese comic books).† (WordIQ par. 3) Anime is like a Drug for them. Otakus just need to watch anime. This However, it doesn’t just stop with watching. One other thing that would define an Otaku is that they have a lot of collectables or even dress up like the characters they watch. "The otaku are an underground (subculture), but they are not opposed to the system per se," observed sociologist and University of Tokyo fellow Volker Grassmuck, who has studied the otaku extensively. "They change, manipulate and subvert ready-made products, but at the same time they are the apotheosis of consumerism and an ideal workforce for contemporary capitalism.† (Cyberpunk Project par. 29) They literally buy everything that has to do with the anime or at least try to make it. It’s amazing to talk to one of these individuals and find out how much time was spent working on their costume or how much money the spent getting a figurine imported from Japan. It’s almost good to have these types of people in a culture to spend the money even if they don’t have it.