Topic 10: Transpiration, transport and support in plants

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1 Topic 10: Transpiration, transport and support in plants 1. Transpiration is A. the loss of water vapour from the surfaces of plants due to evaporation B. the gain of water vapour from the surfaces of plants due to evaporation C. the loss of water vapour from the roots of plants due to evaporation D. the gain of water vapour from the roots of plants due to evaporation 2. Which of the following graphs correctly shows the effect of air movement on the rate of transpiration? A. B. C. D. 3. Four regions of a leaf are listed below. (1) spongy mesophyll (2) air space (3) stoma (4) xylem vessel In which order does water molecules move from the stem into the air?

2 A. (1) --> (2) --> (3) --> (4) B. (1) --> (2) --> (4) --> (3) C. (4) --> (1) --> (2) --> (3) D. (4) --> (3) --> (2) --> (1) 4. Which of the following processes in plants involve active transport? (1) transpiration (2) translocation (3) absorption of minerals (4) absorption of water A. (1) and (2) only B. (2) and (3) only C. (1), (2) and (3) only D. (2), (3) and (4) only Directions: The following question refers to the diagram below, which shows a set-up demonstrating transpiration of plants. leafy shoots layer of oil transparent plastic bag water Set-up X Set-up Y 5. The mass of the set-ups was recorded before the experiment and after 3 hours under sunlight. The mass of set-up Y did not change. It is because A. the carbon dioxide concentration has increased. B. no water vapour could escape from the set-up. C. all the water was absorbed by the leafy shoot. D. the leafy shoot did not carry out photosynthesis. Directions: Questions 6-7 refer to the graph below, which shows the rate of water absorption 9 and water loss of a plant throughout a day. rate of water absorption or loss (arbitrary u :00 05:00 07:00 09:00 11:00 13:00 15:00 time of day 17:00 19:00 21:00 23:00 rate of water absorption rate of water loss

3 6. At which of the following time is the plant most likely to wilt? A. 03:00 B. 13:00 C. 15:00 D. 19:00 7. Through where is water absorbed and lost? Water is absorbed through Water is lost through A. cuticle stomata B. cuticle roots C. roots roots D. roots stomata Directions: Questions 8-10 refer to the experiment below. A leafy shoot in a beaker of fresh water was left under sunlight for 3 hours. The table below shows the change in mass of the plant over a period of time. leafy shoot oil layer water Time (Min) Mass of the shoot (g) Which of the following accounts for the change in mass of the plant throughout the experiment? A. gas exchange B. water loss by transpiration

4 C. loss of energy by respiration D. water loss by osmosis 9. It was found that the of the leafy shoot in set-up Y was much lower than that in set-up X. Which of the following factors accounted for this result? (1) light intensity (2) air movement (3) relative humidity A. (3) only B. (1) and (2) only C. (2) and (3) only D. (1), (2) and (3) 10. The rate of change in mass slows down after 90 minutes. Which of the following is the most likely explanation for this? A. The temperature has increased since the 90 th minute B. Some stomata on the leaves were closed C. The speed of air flow has increased since the 90 th minute D. The leaves have developed a thicker waxy layer Directions: Questions11 to 14 refer to the diagram below which shows a potometer. leafy shoot rubber cork reservoir tap ruler meniscus 11. Which of the following step(s) is/are not necessary in setting up the potometer? (1) Add a thin layer of oil to the reservoir. (2) Smear the lower surface of the leaves with vaseline. (3) Replace the leafy shoot with a small plant with a root system. A. B. C. D. (1) only (1) and (2) only (2) and (3) only (1), (2) and (3) capillary tube air / water

5 12. The lower end of the leafy shoot should be cut under water to A. allow water to fill up the xylem vessels B. allow water to rise up the xylem vessels rapidly C. prevent air from entering the xylem vessels D. prevent air from entering both the xylem vessels and sieve tubes 13. Which of the following is the correct function of the tap below the reservoir? A. It can trap all the air bubbles in water B. It ensures that the apparatus is air-tight C. When the meniscus reaches the end of the capillary tube, we can open the tap to transfer the meniscus back to its original position D. It ensures that water can be kept in the reservoir. 14. The movement of the air/water meniscus will be the fastest when the potometer is put under A. a dry and windy condition B. a dry and sunny condition a dark and windy condition C. a humid and cloudy condition D. 15. Which of the following are important to the turgidity of plant cells? (1) cellulose cell wall (2) lignin (3) water A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 16. The main materials involved in the support of plants are A. cuticle and lignin B. cuticle and water C. lignin and water D. cuticle, lignin and water Directions: Questions refer to the experiment below, an outer ring of tissue in the stem is cut from the plant.

6 17. What will happen after one to two weeks? (1) swelling occurs just above the ring (2) A swelling occurs just below the ring (3) Fruit B will be smaller than A A. (1) B. (2) C. (1), (2) D. (1), (3) 18. Which of the following can be concluded from the result? A. Xylem is responsible for the translocation of nutrients in plants. B. Phloem is responsible for the translocation of nutrients in plants C. The food in the upper part of the plant will grow faster D. Phloem is responsible for the distribution of water and mineral salts 19. The plant will eventually die, this is because A. Invasion of bacteria and fungi kill the plant B. The plant lose support as part of the tissue is lost C. Food cannot be transported to the roots for respiration D. Water absorbed by roots cannot be transported to the leaves Questions 20 to 23 refer to the setup of a potometer shown below. The setup was kept under a bright condition.

7 Initial mass of the potometer = g Final mass of the potometer = g Initial reading on the burette = 12.5 cm 3 Final reading on the burette = 2.5 cm 3 Duration of the experiment = 4 hours 1.0 cm 3 of water weighs 1.0 g 20. The of the shoot is A. 2.0 cm 3 h -1 B. 2.5 cm 3 h -1 C. 8.0 cm 3 h -1 D cm 3 h The mass of water retained in the shoot during the 4 hours is A. 0.5 g B. 2.0 g C. 8.0 g D g 22. What are the possible uses of the water retained in the shoot? (1) As constituent of the cytoplasm (2) To maintain turgidity of cells (3) As a raw materials for respiration A. (1) and (2) only B. (2) and (3) only C. (1) and (3) only D. (1), (2) and (3) 23. A bright condition can make the result more conspicuous because under a bright condition, A. The shoots grow faster B. Rate of photosynthesis is higher C. Rate of transpiration is higher D. More foods accumulate in the leaves

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