8.3. Transpiration
A subsection of Biology, 0610, through 8. Transport in plants
Listing 10 of 250 questions
Complete the sentences about transpiration using words from the list. Each word may be used once or not at all. decomposition evaporation mesophyll phloem root hair cells stomata Transpiration is the loss of water vapour from leaves. Water moves from the surface of cells into the air spaces by . Then the water vapour diffuses out of the leaf through the . A student investigated transpiration. is a diagram of the apparatus used in the investigation. plastic bag surrounding the pot to prevent water loss from the soil balance • The student watered the plant before the investigation started. • She measured the mass of water lost every five minutes. • The mass of water lost represents the rate of transpiration. • She took measurements in still air and with a fan moving air past the plant. • She plotted her results on a graph as lines labelled A and B. shows the results. 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 time / minutes mass of water lost / g Key A fan at full speed B no fan A B Calculate the difference in the mass of water lost between the results for A and the results for B at 30 minutes. g Calculate the percentage increase in water loss shown for A between 10 minutes and 20 minutes. Give your answer to the nearest whole number. Space for working. % The student repeated the investigation using the fan at half‑speed. Draw a line on to show the result you would expect when the fan is at half‑speed. State one factor, other than wind speed, that affects the rate of transpiration.
0610_w23_qp_31
THEORY
2023
Paper 3, Variant 1
View
Questions Discovered
250