Daphnia of same species - Study guides, Class notes & Summaries
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Biology Edexcel Practicals A Level Questions With Complete Solutions
- Exam (elaborations) • 6 pages • 2024
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Biology Edexcel Practicals A Level Questions With Complete Solutions 
 
1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 
Daphnia of same species and volume 
Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes 
Then HR counted using tally marks of a sheet of paper for 15 seconds, x4 to give hr/min 
repeated with unknown conc. of caffeine (blind) 
0.0% and distilled water, 0.1% and 0.5% 
Repeat with each daphnia and with othe...
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Biology Edexcel Practicals A Level Questions With Complete Solutions
- Exam (elaborations) • 6 pages • 2024
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Biology Edexcel Practicals A Level Questions With Complete Solutions 
 
1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 
Daphnia of same species and volume 
Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes 
Then HR counted using tally marks of a sheet of paper for 15 seconds, x4 to give hr/min 
repeated with unknown conc. of caffeine (blind) 
0.0% and distilled water, 0.1% and 0.5% 
Repeat with each daphnia and with othe...
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UCLA Anthro 1: Final Study Guide
- Exam (elaborations) • 12 pages • 2024
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UCLA Anthro 1: Final Study Guide 
Define theories, hypotheses, assumptions, data, & inferences. - Theories: explains CAUSAL relationships at an ABSTRACT level 
Hypothesis: deduced from theory (more specific, 2 variables) 
assumptions: conclusion without evidence 
data: information of any type 
inference: conclusion from evidence 
 
Darwin's Postulates - 1) Population is infinite, but resources are not 
2) Population varies 
3) Heritability (variation passed down) 
 
Ground Finches - Birds on Ga...
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AS Level Biology A H020/01 Breadth in biology WITH CORRECT AND VERIFIED ANSWERS.Which organelle, A to D, is not involved in the production and secretion of enzymes in eukaryotes? A Golgi apparatus B ribosomes C smooth endoplasmic reticulum D vesicle -
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Which organelle, A to D, is not involved in the production and secretion of enzymes in eukaryotes? 
A Golgi apparatus 
B ribosomes 
C smooth endoplasmic reticulum 
D vesicle - CORRECT ANSWERS -C- smooth endoplasmic recticulum 
 
A student designed an investigation into the rate of transpiration in plants. They used eight leaves of the same size, age and species. They kept environmental conditions such as wind speed, temperature and humidity constant. Why did the student take readings from ei...
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