Hope This Helps Good Luck With Your Caie's!!!! [00:00] Paper 4 is an alternative to practical for 509 level biology paper 42 - Paper 4 is for 40 marks and lasts for 1 hour - Question 1 investigates the effect of using an insulating material on heat loss from an animal - Two test tubes were used, one with insulation and one without - Both test tubes were filled with water only up to the marked line to ensure the same volume of water was added to each - Water was not filled right up to the top to prevent water from overflowing when adding the thermometer [02:25] The experiment involves filling test tubes with water and recording temperature changes over time - Water is filled up to a marked line to prevent overflow when adding a thermometer - Temperature readings are recorded every 2 minutes for 10 minutes in a notebook - Insulation is used in some test tubes to observe its effect on heat loss - Results are recorded in a table without writing degrees Celsius in every column - The difference in temperature is calculated to describe heat loss and insulation's effect [04:53] Temperature decreases with time, insulation reduces heat loss, and heat loss is faster at the start - Temperature decreased from 73 to 59 and from 66.5 to 46.5 - Insulation caused less temperature fall (66.5 to 46.5) compared to without insulation (73 to 59) - Heat loss was faster at the start, with a difference of 6.5 to 60, then 6, 5, 3, 2, and 1.5 [07:20] Design an investigation to discover the effect of different surrounding water temperatures on the loss of heat by humpback whales using test tubes filled with water - Test tubes should start with the same volume and temperature of 38°C - Use a thermostatically controlled water bath to maintain temperature control - External temperature can represent cold polar or warm equatorial water [09:47] Investigation on the effect of different water temperatures on heat loss in a test tube representing veal - Test tube filled with water represents veal - Minimum three external temperatures needed: 30°C, 34°C, and 38°C - Record temperature in the test tube at specific time intervals (minimum 5 minutes) - Compare temperature change for each external temperature - Investigate the effect of temperature in a water bath on heat loss [12:14] Whales maintain a constant body temperature of 38 degrees, making the given example irrelevant - Whales' metabolic rate increases to maintain body temperature - Human body temperature is maintained through external factors like clothing and heating - The pulse oximeter measures heart rate and oxygen percentage in the blood - The device fits on the finger and is used to investigate the effect of exercise [14:41] Students recorded pulse oximeter readings before and after exercise, and graphed heart rate against time - Readings were taken at 0, 1, 2, 7, 8, 9, and 10 minutes - Heart rate and percentage of blood oxygen were recorded - The first column of the table is always an independent variable and goes on the x-axis - Graph should connect points with ruler-straight lines, going through a designated point [17:06] Instructions on how to plot heart rate and blood oxygen percentage on a graph - Label the x-axis with time in minutes from 0 to 10 - Label the y-axis with heart rate in beats per minute - Use 75% of the graph and start the scale from 60 - Plot all seven points correctly and join them with ruler lines - Fully label the graph to earn all four marks [19:34] Drawing two lines on a graph to identify the exercise period earns two marks, but it's not valid to determine heart rate at 5 minutes - Drawing a line from the start of the exercise at 2 minutes and another from the end at 7 minutes earns two marks - No data between 2 and 7 minutes means a straight line doesn't show changes in heart rate during exercise - Heart rate increase during exercise is not likely to be linear, so it's not valid to determine heart rate at 5 minutes [22:01] Heart rate increases during exercise from 2 to 7 minutes and returns to resting rate at 10 minutes The percentage of oxygen in blood only changes by 1% between 98 and 99% - Changes in breathing rate and depth could explain percentage oxygen levels during exercise
Best of luck everyone for tomorrow's exams 🙌❤
U too❤
me watching the papers just before a hour of paper 😂😭
mam i want to take your classes plzz emergencyy
You will be fine
Just remain focused
What colour is your Bugatti
Hope This Helps
Good Luck With Your Caie's!!!!
[00:00] Paper 4 is an alternative to practical for 509 level biology paper 42
- Paper 4 is for 40 marks and lasts for 1 hour
- Question 1 investigates the effect of using an insulating material on heat loss from an animal
- Two test tubes were used, one with insulation and one without
- Both test tubes were filled with water only up to the marked line to ensure the same volume of water was added to each
- Water was not filled right up to the top to prevent water from overflowing when adding the thermometer
[02:25] The experiment involves filling test tubes with water and recording temperature changes over time
- Water is filled up to a marked line to prevent overflow when adding a thermometer
- Temperature readings are recorded every 2 minutes for 10 minutes in a notebook
- Insulation is used in some test tubes to observe its effect on heat loss
- Results are recorded in a table without writing degrees Celsius in every column
- The difference in temperature is calculated to describe heat loss and insulation's effect
[04:53] Temperature decreases with time, insulation reduces heat loss, and heat loss is faster at the start
- Temperature decreased from 73 to 59 and from 66.5 to 46.5
- Insulation caused less temperature fall (66.5 to 46.5) compared to without insulation (73 to 59)
- Heat loss was faster at the start, with a difference of 6.5 to 60, then 6, 5, 3, 2, and 1.5
[07:20] Design an investigation to discover the effect of different surrounding water temperatures on the loss of heat by humpback whales using test tubes filled with water
- Test tubes should start with the same volume and temperature of 38°C
- Use a thermostatically controlled water bath to maintain temperature control
- External temperature can represent cold polar or warm equatorial water
[09:47] Investigation on the effect of different water temperatures on heat loss in a test tube representing veal
- Test tube filled with water represents veal
- Minimum three external temperatures needed: 30°C, 34°C, and 38°C
- Record temperature in the test tube at specific time intervals (minimum 5 minutes)
- Compare temperature change for each external temperature
- Investigate the effect of temperature in a water bath on heat loss
[12:14] Whales maintain a constant body temperature of 38 degrees, making the given example irrelevant
- Whales' metabolic rate increases to maintain body temperature
- Human body temperature is maintained through external factors like clothing and heating
- The pulse oximeter measures heart rate and oxygen percentage in the blood
- The device fits on the finger and is used to investigate the effect of exercise
[14:41] Students recorded pulse oximeter readings before and after exercise, and graphed heart rate against time
- Readings were taken at 0, 1, 2, 7, 8, 9, and 10 minutes
- Heart rate and percentage of blood oxygen were recorded
- The first column of the table is always an independent variable and goes on the x-axis
- Graph should connect points with ruler-straight lines, going through a designated point
[17:06] Instructions on how to plot heart rate and blood oxygen percentage on a graph
- Label the x-axis with time in minutes from 0 to 10
- Label the y-axis with heart rate in beats per minute
- Use 75% of the graph and start the scale from 60
- Plot all seven points correctly and join them with ruler lines
- Fully label the graph to earn all four marks
[19:34] Drawing two lines on a graph to identify the exercise period earns two marks, but it's not valid to determine heart rate at 5 minutes
- Drawing a line from the start of the exercise at 2 minutes and another from the end at 7 minutes earns two marks
- No data between 2 and 7 minutes means a straight line doesn't show changes in heart rate during exercise
- Heart rate increase during exercise is not likely to be linear, so it's not valid to determine heart rate at 5 minutes
[22:01] Heart rate increases during exercise from 2 to 7 minutes and returns to resting rate at 10 minutes
The percentage of oxygen in blood only changes by 1% between 98 and 99%
- Changes in breathing rate and depth could explain percentage oxygen levels during exercise
Who's here for tomorrow's p4 😭 you n I
😢
Mam when will you be releasing a revision paper for this year exams like you did last year
Why less than 38?
releate with polar enviornment as temp is cold in polar region