The set up in question 18 is modified so that as the

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19.The set-up in Question 18 is modified so that as the air is breathed in and out it passes through acontainer filled with soda lime, as shown in the diagram below.Which of the following is likely to occur?A.The soda lime changes from colourless to milky.B.The oxygen concentration of the air inside the bag increases.C.The nitrogen concentration of the air inside the bag decreases.D.The carbon dioxide concentration of the air inside the bag decreases.plastic bagclipclipsodalimeplasticbag
S4 Final Exam-BIO A10© Aristo Educational Press Ltd.
20.In an investigation, two weight potometers are set up using two leafy shoots taken from the sameplant and of a similar size. In set-up I, the lower surfaces of all the leaves are smeared withvaseline. In set-up II, the upper surfaces of all the leaves are smeared with vaseline. The diagrambelow shows one of the set-ups.The initial mass of the two set-ups and its mass after two hours were measured. The results areshown in the table below.Set-upLeaf surface smearedwith vaselineInitial mass (g)Mass after 2 hours (g)ILower surface359.3356.2IIUpper surface365.4357.8Which of the following accounts for the results of the investigation?electronic balancewaterleafy shootoil layermeasuring cylinder
21.Which of the following correctly shows the relative amount of chloroplasts in three types of cellin a leaf?
S4 Final Exam-BIO A11© Aristo Educational Press Ltd.
Directions:Questions 22 and 23 refer the information below.In the 17th century, a Dutch scientist, van Helmont, planted a willow tree weighing2.2 kg into 90.9 kg of dried soil in a pot. He then covered the pot and wetted the soilregularly. Five years later, the plant was removed from the soil carefully. Thewillow plant weighed 77 kg while the mass of the dried soil was only reduced by10 g. He concluded that all the increase in plant mass had come from water.22.What was the mass of the dried soil at the end of van Helmont’s investigation?

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