• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12

Germination lab _ siddharth nair

Extracts from this document...

Introduction

BIOLOGY LAB REPORT- EFFECT ON PLANT GROWTH WITH DIFFERENT INORGANIC ION SOLUTIONS Aim: To investigate the effect of different inorganic ions in the form of weak solutions on germinating cress plants. Theory: Photosynthesis is the conversion of light energy into chemical energy by living organisms. The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose, glucose and starch. This process is arguably the most important biochemical pathway, since nearly all life depends on it. It is a complex process occurring in higher plants, phytoplankton, algae, as well as bacteria such as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs. The word comes from the Greek photo-, "light", and synthesis, "putting together". Photosynthesis uses light energy and carbon dioxide to make food. A commonly used but slightly simplified equation for photosynthesis is: 6 CO2(gas) + 12 H2O(liquid) + photons � C6H12O6(aqueous) + 6 O2(gas) carbon dioxide + water + light energy � glucose + oxygen When written as a word equation the light energy appears above the arrow as it is required for photosynthesis but it is not actually a reactant. Here the monosaccharide glucose is shown as a product, although the actual processes in plants produce disaccharides. The equation is often presented in introductory chemistry texts in an even more simplified form as:[2] 6 CO2(gas) + 6 H2O(liquid) + photons � C6H12O6(aqueous) + 6 O2(gas) ...read more.

Middle

This enabled the cress seed to get attached to the finger and thus it could be moved easily. Quantitative analysis (Observations): Table 1: Inorganic ion solution: Observation of plant sample after 1 week: Sodium phosphate * 8 seeds germinated and grew. * Leaves of plants are green and healthy. * 2 seeds did not germinate at all. * Plants that grew stand erect. * Average height was taller compared to other samples. Potassium phosphate * Plants that grew stood upright. * Leaves of plants are bright green and look fresh. * 5 seeds did not germinate at all. * 5 seeds germinated and grew. Sodium nitrate * 6 seeds did not germinate at all. * Leaves of plants were yellowish-green. * 3 of the plants that grew did not stand erect. * 4 seeds germinated and grew. Potassium nitrate * Leaves of plants were dark green in colour. * 4 seeds did not germinate at all. * Plants that grew stood erect. * 2 plants began growing but died later. * 6 seeds germinated and grew. Tap water * The 3 plants were extremely short and curved. * Leaves of plants were bright green but were drooping. * 7 seeds did not germinate at all. * 3 seeds germinated and grew. All 4 solutions * Leaves of the plants had not opened up and were small. * 4 seeds germinated and grew. * 6 seeds did not germinate at all. * The 4 plants were not standing erect. ...read more.

Conclusion

Improvements possible for the experiment: * Distilled water could have been used instead of tap water so that no excess ions could change the concentration of the ions present inside the solutions. * For better accuracy, the volume of inorganic ion solutions poured initially should have been measured for uniformity. The same could have been done with the volume of water poured into the samples everyday. * Results of 3 people could have been compared to these so that possible anomalies could be pointed out. * For measuring the length of the curled up plants a string could be used to measure the experiment to measure the length more accurately. * Only a fixed amount of water should have been added everyday so therefore the results would have been fair and more accurate results could have been obtained. * It should be made sure that no parallax errors occur in the experiment. * It should be made sure that the cress seeds are all in good conditions. * Moreover it should also be made sure that the tissue paper is soaked up properly therefore the seeds would germinate well and therefore there would be less errors. Conclusion: So to conclude it can be said that the plants grew the best with phosphorous present. It did not grow that well in the other nutrients. The errors identified above may have increased the inaccuracy of the experiment. Therefore, it can finally be concluded that plants need all the inorganic ions but they should be in correct quantities and should be added correctly to the plants. Siddharth Nair 10 C 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    If the solution amount on some seeds was altered then the key aspect of the experiment would be ruined and the results would be unusable. Also, if too much inhibitor solution is used then the seeds could be submerged, so not being able to get oxygen, or if not enough

  2. effect of light intensity on the germination and growth of crest plants

    I will now place one dish containing the cress seeds into each shoebox. The A4 sheets of paper will be held down by pins into each box, (one in each corner of each shoebox). 4. After the experiment has been set up I will now place all of my five

  1. In this investigation the effect of nitrate concentration on the growth of plants will ...

    Cambridge sciences biology 1 page 255. Preliminary study To find out what growing medium I am going to use for my investigation, I decided to do a study to see in what sort of growing medium my seeds will grow better in.

  2. An investigation in to the effect of temperature on the release of pigment from ...

    I will time the test tubes to be in the water baths for the beetroot pieces to submerge in for 2 minutes. I feel 2 minutes is valid enough for sufficient diffusion to occur. And that if any more time is given, especially with the higher temperature ranges (i.e. 80)

  1. Factors affecting Germination

    The second was whether the soil was drained or not and the third variable tested was the pH level of the soil - acidic, basic or neutral. The fourth factor tested was frequency of watering, being either; three times a day, two times a day, daily and once every 3 days.

  2. Investigation into Cress Seeds

    To ensure this I will: � Use the same no. of seeds in each petri dish. - Each cultivar will grow with the same competition as the others. Competition can effect the variation a great deal, as it could reduce growth.

  1. Photosynthesis Lab

    In the photosynthetic process, pigments are very important. They absorb light energy and enable it to be converted into chemical energy, which is used by the plants to make glucose and oxygen from carbon dioxide and water. Plants appear to be different colors because of the dominant pigments they contain.

  2. Factors Affecting Seed Germination Lab - the effect of light

    50mm 5 0mm 0mm 2mm 15mm Average 0mm 3.8mm 27.4mm 46.8mm Average 0mm 1.8mm 7.8mm 25.8mm Observations 1. The seeds in the light grew approximately twice as much as the seeds in the dark.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work