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

Germinating Pea seeds biology lab

Extracts from this document...

Introduction

Purpose: To find evidence of respiration in germinating seeds. Background: Cellular respiration, also known as 'oxidative metabolism', is one of the key ways a cell gains useful energy. It is the set of the metabolic reactions and processes that take place in organisms' cells to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products. The reactions involved in respiration are catabolic reactions that involve the oxidation of one molecule and the reduction of another. After a seed drops from a plant it usually goes into a resting period called dormancy when it metabolizes stored energy reserves very slowly. Dormancy is defined as a state during which the seed is not able to germinate. ...read more.

Middle

However, seeds respire at a lower rate throughout dormancy. When plants use sugars stored in their leaves or seeds they undergo cellular respiration Sugar + Oxygen --> Carbon dioxide + Water + Energy (ATP) Bromothymol blue is a chemical indicator for weak acids and bases. The chemical is also used for observing photosynthetic activities or respiratory indicators (turns green then yellow as CO2 is added). In this experiment we will be using Bromothymol blue to determine if CO2 is present or not. Hypothesis: The germinating pea seed will undergo respiration where as the dormant pea seeds will not. Independent Variable: Pea Seeds Dependent Variables: CO2 released Control: No seeds Materials: 3x small test tubes, 3x 125ml Erlenmeyer flask, Dormant Pea Seeds, Germinating Pea seeds, Parafilm, Bromothymol Blue, Small beaker. ...read more.

Conclusion

10. Observe and find evidence of respiration. 11. Record data. The end color of BTB with different seeds BTB Color Germinating Seeds Dormant Seeds No seeds Blue X X Yellow X Evauluations: The rate of respiration could not be determine, however we do know that respiration was occurring in the geminating seeds. Limitations: Abiotic factors were not considered on the rate of respiration. We could not measure the amount of CO2 release by the germinating seeds thus we could not create a general knowledge of the rate of respiration by the germinating seeds. Conclusion: The germinating seeds were the only seeds that showed sign of respiration. This was determined by the yellow color of the BTB solution which indicates CO2 gas present. Dormant seeds had no evidence of respiration because the BTB solution remained the same color. The flask with no seeds had no respiration because there was no organism present to under cellular respiration. ...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 Molecules & Cells 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 AS and A Level Molecules & Cells essays

  1. Marked by a teacher

    Investigating respiration of maggots

    5 star(s)

    It is therefore broken down to give 2 molecules of triose phosphate. 2 hydrogen atoms are then removed from this molecule by 2 nicotinamide adenine dinucleotide (NAD) molecules to form 2 molecules of pyruvate. The diagram below shows the structure NAD.

  2. A Level Biology revision notes

    * Two types of alveoli cells * Type I cells o Composed of endothelium - layer of two thin cells o This allows diffusion of gases (short diffusion pathway) down their conc. gradients o O2diffuses from air to blood; CO2diffuses from blood to air * Type II cells o Secrete

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