The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes. Time in minute The meniscus every two minutes Start 0 2 min 2.8 4 min 6.1 6 mins 10.0 8 mins 12.4 10 mins 16.2 12 mins 21.8 14 min 27.4 16 min 31.1 18 min 39.5 20 min 44.4 Plot these results on the graph and use your graph to calculate the mean rate of movement, in cm per minute, of the meniscus in still air; give your answer to three significant figures.

The mean value of the result calculated in still air are as follow: (Y0- Y1)/2 (0-2.8)/2 = 1.4 (Y2- Y1)/2 (6.1-2.8)/2 = 1.65 (Y3- Y2)/2 (10.0- 6.1)/2 = 1.95 (Y4- Y3)/2 (12.4- 10.0)/2 = 1.2 (Y5- Y4)/2 (16.2-12.4)/2 = 1.9 (Y0-Y1)/2 + (Y2-Y1)/2 + (Y3-Y2)/2 + (Y4-Y3)/2 + (Y5-Y4)/5 1.4+1.65+1.95+1.2+1.9/5 = 1.62 From the above mean result, It is estimated that the meniscus moved 1.62 cm per second in still air. This result indicates that the transpiration rate in still air is comparatively slow. The experiment was performed every two minutes for ten minutes in still air and moving air was recorded. The meniscus is changed its position from 0 to 16.2 in still air. This is because water vapours accumulate around the stomata. When the air is still or there is no wind, humidity may build up around the plant from transpiration eventually decreasing the amount of water being released.

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes. Time in minute The meniscus every two minutes Start 0 2 min 2.8 4 min 6.1 6 mins 10.0 8 mins 12.4 10 mins 16.2 12 mins 21.8 14 min 27.4 16 min 31.1 18 min 39.5 20 min 44.4 Plot these results on the graph and use your graph to calculate the mean rate of movement, in cm per minute, of the meniscus in moving air; give your answer to three significant figures.

The mean value of the result calculated in still air are as follow: (Y6- Y5)/2 (21.8- 16.2)/2 = 2.8 (Y7- Y6)/2 (27.4- 21.8)/2 = 2.8 (Y8- Y7)/2 (31.1- 27.4)/2 = 1.85 (Y9- Y8)/2 (39.5- 31.1)/2 = 4.2 (Y10- Y9)/2 (44.4- 29.5)/2 = 7.45 (Y6-Y5)/2 + (Y7-Y6)/2 + (Y8-Y7)/2 + (Y9-Y8)/2 + (Y10-Y9)/5 2.8+2.8+1.85+4.2+7.45/5 = 3.82 From the above mean result, It is estimated that the meniscus moved 3.82 cm per second in moving air. This result indicates that the transpiration rate in moving air is more. The experiment was performed every two minutes for ten minutes in still air and moving air was recorded. The meniscus is changed its position from 21.8 to 44.4 in still air. This is because when there is wind present around the plant. It moves water-saturated air away from stomata, which reduces external water vapour concentration, increasing the gradient, so water moves out of the leaf. This causes the air to be replaced constantly allowing the plant to transpire.

Mary Jones & Geoff Jones solutions for Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access Transport in Plants Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Exercise 8.2

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 5

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.

These are the results he wrote down.

Start, 0cm

2 min, 2.8

4 min, 6.1

6 mins, 10.0

8 mins, 12.4

1O mins, 16.2

12 mins, 21.8

14 mins, 27.4

16 mins, 31.1

18 mins, 29.5

20 mins, 44.4

Draw a suitable results table in the space below, and complete it to show the student’s results.

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 6

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.

Time in minute	The meniscus every two minutes
Start	0cm
2 min	2.8
4 min	6.1
6 mins	10.0
8 mins	12.4
10 mins	16.2
12 mins	21.8
14 min	27.4
16 min	31.1
18 min	29.5
20 min	44.4

Plot these results on the grid

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 7

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.

Time in minute	The meniscus every two minutes
Start	0
2 min	2.8
4 min	6.1
6 mins	10.0
8 mins	12.4
10 mins	16.2
12 mins	21.8
14 min	27.4
16 min	31.1
18 min	39.5
20 min	44.4

Plot these results on the graph and use your graph to calculate the mean rate of movement, in cm per minute, of the meniscus in still air; give your answer to three significant figures.

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 7

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.

Time in minute	The meniscus every two minutes
Start	0
2 min	2.8
4 min	6.1
6 mins	10.0
8 mins	12.4
10 mins	16.2
12 mins	21.8
14 min	27.4
16 min	31.1
18 min	39.5
20 min	44.4

Plot these results on the graph and use your graph to calculate the mean rate of movement, in cm per minute, of the meniscus in moving air; give your answer to three significant figures.

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 8

Do the results support the student’s hypothesis? Explain your answer.

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.

Time in minute	The meniscus every two minutes
Start	0
2 min	2.8
4 min	6.1
6 mins	10.0
8 mins	12.4
10 mins	16.2
12 mins	21.8
14 min	27.4
16 min	31.1
18 min	39.5
20 min	44.4

Do the results support the student’s hypothesis? Explain your answer.

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Biology for Cambridge IGCSE Workbook 4 th Edition Digital Access>Chapter 8 - Transport in Plants>Exercise 8.2>Q 9

The student placed a leafy shoot in the apparatus and stood it in a place in the laboratory, where the air was still. He recorded the position of the meniscus every two minutes for ten minutes. He then placed the fan close to the apparatus and switched it on. He continued to record the position of the meniscus every two minutes for the next ten minutes.
These are the results he wrote down.

Time in minute	The meniscus every two minutes
Start	0
2 min	2.8
4 min	6.1
6 mins	10.0
8 mins	12.4
10 mins	16.2
12 mins	21.8
14 min	27.4
16 min	31.1
18 min	39.5
20 min	44.4

Evaluate the student’s method. For example, did the student control all the important variables? Did his method really measure what he thought he was measuring?

Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Exercise 8.2

Mary Jones Biology Solutions for Exercise - Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Exercise 8.2

Questions from Mary Jones and Geoff Jones Solutions for Chapter: Transport in Plants, Exercise 2: Exercise 8.2 with Hints & Solutions

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