• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

Introduction

Aim: To investigate the effect of light intensity on the germination and growth of cress plants. Hypothesis: Plants feed by photosynthesis. They use carbon dioxide from the air and water to make carbohydrates. This process requires an energy input - this energy comes from a light source. Plants need an adequate amount of light for the process of photosynthesis to occur correctly. When a plant photosynthesises it is providing itself with food to grow, without the component of light, a plant will not grow correctly because light is a limiting factor; I therefore predict that the cress seeds growing in complete darkness will become etiolated (they will be taller and thinner than the others; seeking any available light). The seeds in full sunlight will grow to be shorter but stronger. Plan: 1. I will firstly collect my apparatus: 5 dishes with an equal diameter of 10cm (the dishes will be used as a base), 25 cotton wool pads (each dish will be layered with the cotton wool pads as a basis for the seeds to grow on), cress seeds, 5 equal sized shoe boxes (a dish will be placed into each box), 12 sheets of standard A4 paper (the paper will be used as light filters to decrease intensities), a syringe (to measure equal amounts of water for each plant), pins (to pin paper onto certain shoeboxes) ...read more.

Middle

7. Now that I have carried out my experiment and have a set of results I will go on to draw my diagram, process my results onto a bar chart and finally write a detailed conclusion and evaluation. I also will state any modifications to my plan. Modifications to plan: As my experiment was in procedure I decided to make two modifications to my plan which were necessary but also beneficial to my overall results: * Instead of watering each plant with 15cm3 a day I had to change the amount of water each plant received. I discovered that the water from the plant in complete darkness didn't evaporate as quick of that in the plant in complete sunlight. I therefore watered the plant in complete darkness with 5cm3 of water (after the second day), this was a necessary modification as the plant would have been overwatered most likely killing it. I also watered the plant with 6 pieces of A4 paper covering it with the same amount of water for the same reasons. I reduced the amount of water the plant with 4 pieces of A4 covering it to 10cm3 a day, as it would have also become over watered. The plant with two pieces of paper covering it and the plant in full sunlight received the original amount of 15cm3 of water a day as they weren't concealed enough to prevent water evaporating. ...read more.

Conclusion

length Evaluation: Overall I think I carried out the experiment fairly well as everything went to plan and there were no anomalous results. However in an ideal world there could have been a few things that I could have done to improve my experiment. I firstly could have a had a larger difference in intensities of light, for example I could of had ten different boxes where the first and last would be in complete darkness/light (equivalent to before) however the boxes in between could of had from 1 sheet to 8 sheets of paper covering the plants, providing me with a larger range of results to use. I could have also measured the lengths of 20 stems from each box once again giving me a wider range of results to focus on and analyse. A minimal factor that could have had a slight effect on my results would be controlling the amount of time it took to water the plants every day, as the plants that were meant to be in complete darkness and unidirectional light were exposed to full light at the time of watering them. If there was a way that I could water the plants without exposing them to full light, I think I would gain a much more precise set of results. However overall I think that I carried out my investigation to a high standard with few errors. ?? ?? ?? ?? English International College: ES130 Name: Archie Mustafa Skills: C4 ...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. Investigating The Effect Of Light Intensity On Cress Seedlings.

    5th Seedling 6th Seedling Average 1 6.2cm 6.0cm 6.1cm 6.2cm 6.3cm 6.1cm 6.15cm 3 7.0cm 7.1cm 7.5cm 7.4cm 7.1cm 7.3cm 7.23cm 5 7.4cm 7.0cm 7.1cm 7.6cm 7.4cm 7.3cm 7.31cm 7 7.9cm 8.0cm 8.1cm 7.8cm 7.9cm 8.0cm 7.95cm 9 8.4cm 8.3cm 8.0cm 8.3cm 8.5cm 8.4cm 8.32cm 11 9.1cm 9.0cm 8.4cm 8.4cm

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

    increasing the surface area that is in contact with soil water, thus increasing the rate at which the ions and minerals are absorbed. However, these root hairs are very delicate and only function for a few days before being replaced by new ones as the root grows.

  1. Investigation into Cress Seeds

    Place petri dishes in tray. 8. Place cling film again over the top, securing with tape to make environment airtight. 9. Every day remove cling film and water with 10mm of water. On Friday, water with 20mm of water. 10. Once they have grown, I will measure every cress in each petri dish.

  2. The purpose of this investigation was to determine what effects different pH levels, more ...

    * Eating and drinking were banned in laboratory. * Caution was taken when handling pH buffer solution. It was not digested or and did not come into contact with skin or eyes. If this had occurred, the affected area was to be washed straight away and the teacher was alerted immediately.

  1. An Investigation To Show What Different Factors Affect The Growth & Germination Of Cress ...

    The different solutions I am going to use are: Lacking Nitrogen Lacking Sulphur Lacking Magnesium I am also going to have a control test, which has all the nutrients a plant would have in normal soil. This is so I can compare the experiments to it allowing me to see what changes the absence of the minerals has.

  2. An investigation into the effects of different concentrations of lead chloride on the growth ...

    Many features of photosynthesis are therefore affected. Many chemical reactions occur in living organisms. In plants, the uptake of lead affects the functioning of enzymes. Enzymes are protein molecules which contain amino acids which may contain cysteine. A component of cysteine includes sulphur and as lead has a high affinity

  1. Factors affecting Germination

    Discussion Ocimum Basilicum belongs to the family 'Lamiaceae' and is an annual herb (Simon, 1998). It is thought to have originated from the tropics of Asia and in particular India (Floridata, 2007). Basil is now cultivated worldwide and there are many different types of basil such as lettuce-leaf, lemon, cinnamon, Thai and of course the Sweet Genovese (Davis, 1997).

  2. Factors That Germination Influence

    After (Days) 2 4 6 8 10 12 14 Conc. (%) Repeat 2 1 2 3 4 5 6 Mean 1 1 2 3 4 5 6 Mean 0.5 1 2 3 4 5 6 Mean 0.25 1 2 3 4 5 6 Mean 0.125 1 2 3 4 5

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