Rates of Photosynthesis
Related Topics: GCSE/IGCSE Biology Biology Required Practicals GCSE/IGCSE Physics GCSE/IGCSE Chemistry GCSE/IGCSE Maths
GCSE Biology Required Practical - Photosynthesis Experiment
Investigate the effect of light intensity on the rate of photosynthesis.
- Pondweeds (Algal balls or similar) must be set up and placed at varying distances from a light source to investigate the effect of light intensity on the rate of photosynthesis.
- The rate must be measured and compared to the distance away from the light source.
Rates Of Photosynthesis How to measure the rate of photosynthesis of pondweed?
00:00 Preparing the sample 02:34 Changing light intensity 04:21 Counting bubbles 05:11 Analysing data 05:23 Alternative method - volume of collected gas
Required Practical: Photosynthesis
- How to investigate the effect of light intensity of the rate of photosynthesis in a pondweed.
- Explain how the results of this are affected by the inverse-square law. (Higher Tier)
Check out the sample question and solution on Sample Assessment Material (page 33) , paper 1BI0/1BH and 1BIO/1BF.
A scientist investigates the effect of light intensity on photosynthesis. He sets up the equipment shown in figure 1. He places the lamp 10cm from the test tube and records the numbre of bubbles produced in five minutes. He repeats the procedure with the lamp at a distance of 20cm and 30cm away from the test tube. The scientist wants to repeat his investigation at each distance. State three variables that should be kept constant to improve the results.
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Figure 1 shows the apparatus. This is the method used. 1. Place the pondweed at 5 cm from the light source. 2. Measure the rate of photosynthesis by counting the number of bubbles produced in. 30 seconds. 3. Repeat the investigation with the pondweed at different distances from the light source.
pondweed practical steps. 1. white light placed a certain distance from pondweed. 2. pondweed left to photosynthesise for a set time. 3. as it does oxygen will be released and collected in the capillary tube. 4. at the end measure the length of gas bubble this is proportional to the volume of oxygen. 5. repeat twice more for each distance.
Revision Notes. Chemistry. ChemistryLast Exams 2024SL. Topic Questions. Revision Notes. Revision notes on 4.1.4 Required Practical: Photosynthesis Rate for the AQA GCSE Biology syllabus, written by the Biology experts at Save My Exams.
This is the method used. Weigh five pieces of carrot. Place each piece into a different tube. Into each tube add 20 cm3 of water or one of the sugar solutions as shown in FIGURE 6. Leave the apparatus for 2 hours. Remove the carrot and dry each piece on paper towel. Reweigh each piece.
Where I is light intensity and d is the distance of the pondweed from the light source. The student placed the pondweed at 5, 10 and 20 cm from the light source. Explain how light intensity changes as the distance of the pondweed from the light source is doubled. You must include calculations in your answer. [3 marks]
Core practical: Photosynthesis. Describe the method for the pondweed practical. Click the card to flip 👆. 1. Fill a beaker with a known volume of sodium hydrogencarbonate, and to it add a known amount of pondweed. 2. Set up a lamp on one end and place a metre ruler on the table. 3. Place a beaker with water in front of the lamp to act as a ...
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Study with Quizlet and memorize flashcards containing terms like - Distance of pondweed from the light source, - Number of bubbles released by pondweed in one minute, Any three from: - Same cutting of pondweed - Same lamp with the same bulb - Same level of background light (preferably none) - Same volume of sodium hydrogen carbonate solution - Same temperature and more.
Instructions. Use black ink or black ball-point pen. Pencil should only be used for drawing. Fill in the boxes at the top of this page. Answer all questions in the spaces provided. If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s).
Test; Match; Flashcards; Learn; Test; ... Allow 2 minutes for the pondweed to adjust to the light intensity. Count... Count the number of bubbles released in 1 minute using a timer. Move... Move the lamp 10cm further away until 50cm. Move... Move the lamp closer to the pondweed each time in 10cm intervals.
Check out the sample question and solution on Sample Assessment Material (page 33), paper 1BI0/1BH and 1BIO/1BF. A scientist investigates the effect of light intensity on photosynthesis. He sets up the equipment shown in figure 1. He places the lamp 10cm from the test tube and records the numbre of bubbles produced in five minutes.
It is easy to identify if a piece of pondweed is photosynthesising because they release oxygen gas that forms visible bubbles in water or solution. The more bubbles produced, the more oxygen produced and the faster the rate of photosynthesis.. Light intensity can be altered by moving a light source closer and further away from the plant; the greater the distance, the lower the light intensity.
Pondweed practical. Term. 1 / 15. To investigate the effect of light intensity on the rate of photosynthesis. Click the card to flip 👆. Definition. 1 / 15. Aim of experiment. Click the card to flip 👆.
Pondweed Required practical exam questions. Why place pondweed in a solution of sodium hydrogen carbonate? Click the card to flip 👆. To provide carbon dioxide. So that carbon dioxide is not a limiting factor.
1. Rate of photosynthesis (bubbles of oxygen per min.) 1. Same size, specie of pondweed. 2. Same concentration of liquid. 3. Same power of bulb. 4.