Plant hormones

9.In an experiment, a plant pot is attached to a clinostat and rotated slowly on its side in a darkened room. What is the expected result after two days?

10.A plant shoot is illuminated from one side. Which image best represents how auxins will start to accumulate in the shoot tip in response to light?

11.A scientist investigated the effects of gibberellins on flowering in plants. The plants were grown in identical environmental conditions but half were treated with gibberellins. The results showed that treated plants flowered earlier. What conclusion can the scientist make about gibberellins?

12.Which of the following is a commercial use of gibberellins?

13.A student investigated the effect of light direction on cress seedling growth. Group A (light from left) bent towards the light; Group B (light from above) grew straight upwards; Group C (no light) grew straight upwards but yellow. The student concluded 'Light always makes seedlings grow towards it.' Evaluate this conclusion.

14.Which of the following statements about auxins are correct? (select all that apply)

15.Which of the following are commercial uses of plant hormones? (select all that apply)

16.Phototropism is a plant's growth response to gravity.

17.Auxins are produced in the tips of shoots and roots.

18.In roots, a higher concentration of auxin leads to more cell elongation and faster growth.

19.Ethene is a gas that controls cell division and the ripening of fruits.

20.Gibberellins are important in initiating seed germination.

21.Shoots show a positive gravitropic response and a negative phototropic response.

22.Match each plant response to the correct part of the plant.

23.Match each plant hormone to its function.

24.Place the steps in the correct order to describe how auxin causes a shoot to bend towards light.

25.Order the steps to describe how a root responds to gravity when placed on its side.

26.Which of the following statements about the distribution of auxin in shoots and roots are correct? (select all that apply)

27.Which of the following are effects of gibberellins? (select all that apply)

28.Match each plant hormone with its commercial use.

29.Match each plant response with the correct description.

30.Place the steps in the correct order to describe how auxin causes a shoot to bend away from gravity when placed on its side.

31.A plant shoot is placed on its side in the dark. Which side of the shoot will have the higher concentration of auxin?

32.Which of the following best explains why a shoot bends towards light?

33.A shoot tip is removed from a young plant and the cut tip is placed on a block of agar. The agar block is then placed on one side of the cut shoot, which is kept in the dark. What is the expected result after several days?

34.A student places a germinated bean seedling horizontally in a dark box. After 3 days, the root has grown downwards and the shoot has grown upwards. Which statement best explains the root's response?

35.A clinostat is used in plant growth experiments to cancel out the effect of gravity.

36.A farmer wants to transport unripe bananas to a supermarket and then ripen them quickly on arrival. Which of the following methods would be appropriate? (select all that apply)

37.A student sets up an experiment with two groups of bean seedlings. Group A is grown in normal light from above. Group B is grown with a light source from the right side only. After 5 days, the mean shoot length in Group A is 45 mm and in Group B is 42 mm. Which conclusion is best supported by these results?

38.A gardener takes cuttings from a rare plant and wants to produce many identical plants quickly. They dip the cut ends into a powder before planting. Which hormone does the powder contain and why?

39.Place the steps in the correct order to describe how auxin causes a shoot to bend towards unilateral light.

40.A student investigates the effect of gravity on seedling growth. They place one petri dish on a support on its side and another on a clinostat, both in a lightproof box. After two days, what is the expected result for the seedlings on the clinostat?

41.A plant shoot grows 42 mm in 7 days. Calculate the mean growth per day in mm.

42.In an experiment, the mean length of shoots in Group A was 42 mm and in Group B was 38 mm. Calculate the difference in mean length in mm.

43.Complete the sentence using the correct term.

44.Complete the sentence using the correct terms.

45.Name the plant hormone responsible for controlling phototropism.

46.Name the plant hormone responsible for both phototropism and gravitropism.

47.In an experiment, a shoot grows 72 mm in 6 days. Calculate the mean growth per day in mm.

48.Complete the sentence about the effect of auxin on shoot cells.

49.Describe the biological mechanism that results in a shoot bending towards the light.

50.Explain the role of auxins in coordinating the response of a seedling when it is placed on its side in the dark.

51.A student investigated gravitropism using bean seedlings. Explain why it is important to place the seedlings in a dark room.

52.Describe how a suitable control could be set up for an investigation into gravitropism using bean seedlings.

53.Explain why a root and a shoot respond differently when placed on their sides in the dark. Include reference to auxin distribution and cell elongation in your answer.

54.A plant shoot grows 42 mm in 7 days. Calculate the mean growth per day in mm.

55.In an experiment, the mean length of shoots in Group A was 42 mm and in Group B was 38 mm. Calculate the difference in mean length in mm.

56.In an experiment, a shoot grows 72 mm in 6 days. Calculate the mean growth per day in mm.