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

Investigation into Cress Seeds

Extracts from this document...


Investigation into Cress Seeds PLAN Aim:coec ecr seececw orec eck inec foec ec; I will be investigating into the 'height' characteristic for each of the six cultivars of cress. I have chosen height because I want to choose a characteristic with continuous variation. A characteristic with discontinuous variation will not provide any readable results, therefore with a continuous variation characteristic, I can compare the differences in variation more easily. From this, I can also compare the selective breeding. Here is a diagram to explain what I mean by this: Heidegger obfuscated ronen's functionalism . SELECTIVE BREEDING E.g. height of carrots Height (mm)coee eer seeeeew oree eek inee foee ee. Selective breeding is the crop which is only allowed to breed. For example, Carrots wih highest lengths are required. To achieve this farmers have tried to overcome by this by controlling the two factors, which influence this characteristic, the environment and genes. A plant may have inherited genes for tallness HH, but has not got enough of the three main elements needed to grow, water, minerals and sunlight from its environment.cofd fdr sefdfdw orfd fdk infd fofd fd. Therefore, farmers first grow cress in ideal environments with sufficient light, water and minerals. Only the tallest crops are then selected to breed together. A new crop is grown. From that crop another batch and once again only the tallest crops are selected to grow. If we were to look at the graph and see the height with the highest number this would be the selective breeding crop. ...read more.


Safe Test: To ensure a safe test I must � Be careful NOT to drop the tray when taking it to the sink to be watered. � '' '' when cutting roots with the scalpel. OBTAINING EVIDENCE: RESULTS TABLE TYPE GERMINATION NO. HEIGHTS (mm) Lepidium 16 4, 5, 8, 8, 10, 10, 12, 12, 12, 13, 13, 13, 13, 15, 16, 19, Organic 22 + 1 15, 15, 20, 30, 34, 34, 35, 35, 36, 37, 37, 37, 38, 38, 38, 40, 40, 42, 45, 45, 46, 51 Thomson Morgan 22 + 1 20, 26, 29, 30, 34, 34, 35, 38, 38, 40, 41, 41, 43, 45, 45, 45, 46, 46, 47, 50, 51, 52 HurstCurled 19 5, 5, 8, 10, 10, 10, 10, 11, 11, 12, 15, 15, 16, 18, 19, 20, 23, 30, 30, Mr. Fothergills 23 16, 20, 23, 23, 24, 27, 30, 33, 33, 34, 35, 35, 37, 37, 37, 40, 40, 40, 40, 40, 40, 43, 45, Cress curled 25 20, 22, 22, 23, 23, 25, 25, 25, 25, 30, 32, 33, 33, 33, 33, 35, 38, 38, 38, 40, 40, 40, 40, 40, 41, * Numbers added on, are seeds that have germinated, but have not yet grown shoots. I have taken my results and placed them into a table for all six cultivars of cress. (See table). I have also used the results of others to show evidence of secondary data. This has helped me to make my results more accurate. ...read more.


Below are some reasons. Anomalies: Though my results were quite reliable, I still ended up with few anomalies. This could have been caused by the following reasons: � Positioning of tray - some cress seeds may not be receiving the same amount of sunlight as the others so the rate of photosynthesis would have varied. � Watering - We may have watered our cress at different times. N.B. For two days it was cloudy and therefore no watering was needed on those days. I did not water my cress but others may have. � Positioning of seeds - We may not have all equally placed our seeds so competition may have affected this. I have circled anomalies and noted what could have possibly caused this. Improvements: � I would take more care in preparation using the same size petri dishes and taking more care in placing the seeds. This would make the competition fair for each cultivar. � I would place them in a much more controlled environment. All of them would be placed in similar areas where the would receive the same sunlight. � I may use a larger data than just 25 seedlings per cultivar. Further Improvements � I could have carried out two lots of results if more equipment was available. This way I may not need to use other people's results. � I could have investigated into another factor, which I could have provided more scientific reasons for. E.g. 'would cress grow better in cotton wool or sugar paper'. we can say that whilst this represents a progression, in the end ...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 temperature is too low, germination will be slowed, if the temperature is too high, germination may be grossly accelerated.] o Light intensity. Again may perhaps be difficult to keep constant, unless artificial light is used. [The amount of light may have an effect on how the investigation will

  2. The investigation is aiming to look at transpiration.

    To obtain reliable results, I avoided the following mistakes: When the leaf was cut from the plant I quickly immersed it in water to prevent air bubbles. I also inserted the leaf into the bung of the potometer. If an air bubble forms in the column, then the column of

  1. An Investigation into Species Diversity with distance along a Pingo.

    It is circled on the graph and is at zone 3 which had an intensity of 2.60 lux. This was an increase from zone 2 which had 2.40 lux. It was an unexpected result and appeared to be higher than it ought to be, this could be because of inaccuracy

  2. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    ---Oxygen solubility in water is low and varies with temperature, the lower the temperature the more oxygen dissolves. But the temperature in the environment is always fluctuating so the readings taken by the oxygen meter for oxygen may not be reliable.

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

    The more competition there is then the less the plants will grow. This is because the minerals, nutrients and sunlight (in plants case) have to be 'spread out more thinly' or shared out amongst a higher number of plants. In some cases plants will die due to a lack of nutrition.

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

    and is highly effective at inhibiting ATPase - an enzyme required in the production of ATP in photosynthesis (and respiration). It also disrupts the chloroplasts and, reduces the production of chlorophyll and carotenoids, interrupts the electron transport chain and causes the closure of stomata which results in a lack of carbon dioxide.

  1. Investigation into the effect of varying concentrations of potassium nitrate solution, on the germination ...

    However, above a certain temperature the enzymes vibrate so energetically that some of the bonds holding the enzyme in its precise shape begin to break. The substrate can no longer fit into the enzymes active site so no reaction can occur.

  2. Factors That Germination Influence

    Any experimental discrepancy will be due to chance. Safety Wear safety glasses at all times to prevent salt water coming in contact with eyes. Preliminary Experiment To determine the concentration ranges that will give the best results a preliminary experiment is needed.

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