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Experiment examining the effect of mineral deficiencies on plant growth.

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Core Practical Write Up Investigate the effect of plant mineral deficiencies Planning Dependant variable: we are going to be observing the changes in root length, plant body length, number of living leaves and colours of leaves. Independent variable: we will be varying the mineral deficiency in the agar jellies. There will be five ager jelly dishes. There will be one dish containing all nutrients; one dish lacking magnesium; one dish lacking nitrogen; one dish lacking calcium; and one without any of those nutrients. Controlled variables: We are going to be controlling the type of plant growing in the agar jelly. We are using Mexican hat plantlets for our experiment. The time between each measurement is going to be controlled, when one plant is observed all the other plants will also be observed so plants have equal amounts of time to grow. Hypothesis: From what I have learnt in class when a plant lacks nitrogen it should be unable to grow larger because amino acids production will be reduced. ...read more.


Babies have grown larger, slightly purple 12mm roots 13mm body 6 leaves(2 babies) Larger babies Dark green 13mm roots 13mm body 6 leaves (2 babies) All growing well Green No Nutrients 15mm roots 14mm body 6 leaves (2 babies) Green leaves 12mm roots 14mm body 4 leaves 2 purple leaves No growth in babies 16mm roots 12mm body 4 leaves 2 dead 2 purple pigmented 27mm roots 13mm body 4 leaves 4 dead and purple Conclusion The plant containing all the nutrients grew longer roots and body, after the 3rd observation we noticed the leaved had started to die and were dead at the last observation. We could see the leaves were dead because they have a strong purple pigmentation. These plants were supposed to grow normally throughout the experiment according to our hypothesis. The plant lacking magnesium had a slight growth in the roots and shrinking. The body of the plant grew a little bit and the leaves stayed green and healthy throughout the observations, this was odd because we expected the leaves to turn yellow in our hypothesis due to the low production of chlorophyll. ...read more.


There are a lot of things that happened we did not expect to happen. The agar jelly containing all nutrients was expected to grow healthily. However the plant seemed to decay much faster than plant lacking all nutrients! This may have been due to the conditions within the Petri dishes. There must have been a source of random error. The concentration of the nutrient may have had an effect on the uptake of the mineral. There may have been a lacking source of light or moisture in the plate resulting in the lack of growth. There are many other random errors that may have occurred. The method used does test the hypothesis however when carrying out the experiment again I would have to insure another two repeats and identical conditions for the plants. The only variable must be the mineral deficiency given to the plant. The number of recording taken must be more consistent and frequent. Over all the experiment wasn't very reliable but the results taken were very interesting as they did not agree with my hypothesis. This was due to many random errors present. ?? ?? ?? ?? Shivalee Patel 1 ...read more.

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Here's what a teacher thought of this essay

4 star(s)

A good description of an investigation which produced unexpected results. Excellent risk assessment and a clear understanding of variables and relevant theory. More detail about the method would have been useful.

4 Stars

Marked by teacher Adam Roberts 25/10/2014

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