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8.3. Transpiration
A subsection of Biology, 0610, through 8. Transport in plants
Listing 10 of 250 questions
Define the term transpiration. shows four leaves from the same tree. ) * + - leaf eaten by insect Suggest which leaf will transpire most rapidly and give a reason for your answer. leaf reason shows a healthy plant during an investigation into transpiration. It was kept in the same environment, apart from the light changing, during 24 hours. The mass of the plant and pot was measured at the start, after 12 hours in the light and after a further 12 hours in the dark. 2.50 kg plastic bag 2.30 kg plastic bag 2.25 kg plastic bag at the start after 12 hours in the light after a further 12 hours in the dark Describe the results of the investigation shown in . Suggest and explain why the plant pot was enclosed in a plastic bag for this investigation. State two environmental factors, other than light, that would change the rate of transpiration in the plant shown in .
0610_w15_qp_23
THEORY
2015
Paper 2, Variant 3
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A student carried out an investigation into transpiration from leaves. She chose leaves of a similar size from the same plant. She weighed them and then placed them in different conditions. As the leaves transpired they lost mass. Table 3.1 shows the results. Table 3.1 leaf conditions mass at start / g mass at end / g change in mass / g % change in mass H hot and dry 6.3 2.1 4.2 66.7 J cool and dry 6.4 4.6 1.8 K hot and humid 6.2 3.7 40.3 L cool and humid 5.1 4.7 0.4 7.8 Complete the table by calculating: the change in mass for leaf K the percentage change in mass for leaf J. Show your working. Write your answer to one decimal place. State which conditions caused the most transpiration in the leaves. shows four types of plant tissue involved in the transport of water through a plant. M P N O Describe how tissue O is adapted for its function. Complete the flow chart by placing the letters of the cells M, N, O and P in the correct order, starting with the absorption of water. absorption of water transpiration from the leaf State the name of: the type of tissue in which water is carried up the stem another substance which is carried in the same tissue.
0610_w16_qp_31
THEORY
2016
Paper 3, Variant 1
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Name the plant cell that is specialised to absorb water from the soil. shows a section through a plant root and a plant stem. root stem Label the xylem tissue in the root and the stem on . Use label lines and the letter F. A student carried out an investigation into the rate of transpiration. shows three identical shoots and the way the leaves were treated in the investigation. Petroleum jelly is greasy and waterproof. All three shoots were kept in the same conditions for one hour. shoot L shoot M shoot N end of shoot in water no petroleum jelly on the leaves petroleum jelly on the lower surface of the leaves petroleum jelly on the upper surface of the leaves end of shoot in water end of shoot in water Table 10.1 shows the results of the investigation. Table 10.1 shoot rate of transpiration / arbitrary units per hour L M N Suggest why shoot M lost water more slowly than shoot L. Suggest why the rate of water loss was similar for shoots L and N.
0610_w16_qp_32
THEORY
2016
Paper 3, Variant 2
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Questions Discovered
250