• 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

# Investigate the factors that affect the growth rate of a population (plant).

Extracts from this document...

Introduction

Growth Population of Duckweed Task Investigate the factors that affect the growth rate of a population (plant). Prediction I would predict that the following factors could make a difference to how well a plant population increases. Factor (Variable) Why it makes a difference How we could control for an investigation Light need To photosynthesise put paper around jars Temperature enzymes grow faster put more in same room pH to acidic to alkaline, plant will die use universal indicator to control Method In order to see a change in a population we will need to select a plant that reproduces rapidly so we will use duckweed which reproduces asexually. We will set up duckweed plants in different conditions to see how they react to different light intensities and with different amount of fertilizers as shown below. ...read more.

Middle

No light was when the light had to pass through black sugar paper and there was a reading of 33%. Each experiment was carried out twice and both sets of results can be seen above, and then followed by the average of the two brackets. In full light the duckweed population grew with and without fertilizer. It had a steady rate of growth, but each week it went up, some times by a substantial amount and sometimes with a minimal amount. In partial light the duckweed population grew but very slowly. At all times the population was around the same mark. There was a slight drop of the duckweed population towards the end of the experiment, at day 42 all of the tests died out causing the population of duckweed to decrease. ...read more.

Conclusion

Evaluation This has been an event full experiment, but it wasn't really a fair test. There are many factors that I would change if I was to do the experiment again. Counting duckweed isn't very accurate as each individual duckweed could weigh a different weight. I would weigh the duckweed next time and make sure I have them all the same weight, so then it is more reliable. I would also do the experiment in different conditions, such as temperature, I would try it in a fridge, body temperature, a greenhouse and at room temperature. There is a slight disadvantage to doing this at room temperature as the room temperature is not the same all the time, and if I was to put the experiment in the fridge it wouldn't see natural sunlight and photosynthesis may not take place. My prediction is well founded because of what happened in the results, ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Population & Settlement 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

# Related AS and A Level Population & Settlement essays

1. ## Geography revision - flooding - Urbanisation - Population problems

fuels Come from the ground, were created millions of years ago from dead matter Mining is an example of energy change in Britain. Open cast mining is ugly, hazardous, and noisy however, it is easier to mine and machines can be used.

2. ## Grassland - The mark and recapture method.

The confidence level is 22.82, this suggests that the data is reliable, as it is smaller than the calculated mean 63. ?� To determine whether or not the difference between the expected snail population and the observed snail population is significant at each area site.

1. ## Does a population hierarchy exist on the Ards Peninsula?

I have also been able to compare two similar settlements, Ballywalter and Kircubbin, to find out why they are not as far apart as one would expect. This sub-hypothesis leads me to sub-hypothesis 6 of the Breaking Point theory. HYPOTHESIS 6 "Can the Breaking Point theory be applied to the Ards Peninsula?"

2. ## POPULATION GROWTH - China

The Mongolian language consists of several dialects, but in religion it is a unifying force; most Mongolians are believers in Tibetan Buddhism. A few linguistic minorities in China belong to neither the Sino-Tibetan nor the Altaic language family. The Tajik of westernmost Sinkiang are related to the population of Tajikistan and belong to the Iranian branch of the Indo-European family.

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