Seed dispersal

9.Seeds with hooks or spines are most likely to be dispersed by:

10.Which of the following best explains why seed dispersal reduces competition?

11.Gravity dispersal is most effective when:

12.Which of the following is NOT a method of seed dispersal?

13.A student drops a seed from a height of 1 m in front of a fan. The seed travels 2.5 m horizontally before hitting the ground. If the fan speed is increased, what would be the most likely effect on the distance travelled?

14.In an experiment to compare wind dispersal of three seed types (A, B, C), a student drops each seed from the same height in front of a fan and measures the distance travelled. The results are: A: 1.2 m, B: 0.8 m, C: 2.5 m. Which seed is most likely to have a wing-like structure?

15.A student counts the number of seedlings growing at different distances from a parent plant. The results are shown in the table: Distance (m) | Number of seedlings 0-1 | 2 1-2 | 5 2-3 | 12 3-4 | 8 4-5 | 3 What conclusion can be drawn about seed dispersal?

16.Which of the following is an example of a seed dispersed by explosive mechanism?

17.A student wants to test whether seeds with hooks travel further on animal fur than smooth seeds. Which of the following is the independent variable?

18.In an investigation, a student places a seed in a stream of water and measures the time it takes to travel 1 metre. The seed has a waterproof covering. Which of the following would most likely increase the time taken to travel 1 m?

19.What is the main advantage of seed dispersal for a plant species?

20.A graph shows the number of seeds germinating at different distances from a parent tree. The highest number germinates at 10 m, with numbers decreasing at greater distances. Which dispersal method is most likely responsible?

21.Which adaptation would be most useful for a seed that is dispersed by water?

22.Which method of seed dispersal relies on seeds being eaten by animals and later excreted?

23.A student measures the distance travelled by five seeds of the same type dropped from the same height in front of a fan. The distances are: 1.5 m, 1.7 m, 1.6 m, 1.5 m, 1.7 m. What is the mean distance?

24.Which of the following is a reason why seed dispersal is important?

25.Coconuts are dispersed by water. Which adaptation helps them to float?

26.Which of the following seeds is most likely to be dispersed by explosive mechanism?

27.A student drops a seed from a height of 1 m in front of a fan set at medium speed. The seed travels 2.0 m horizontally. If the fan speed is increased to high, what would you expect to happen to the distance travelled?

28.In an experiment to compare wind dispersal of three seed types (A, B, C), a student drops each seed from the same height in front of a fan and measures the distance travelled. Which variable should be kept constant?

29.A student investigates wind dispersal using a fan. They drop a seed and measure the distance it travels. They repeat the test five times with the same seed type. Which of the following would improve the reliability of the results?

30.A student places a seed in a stream of water and measures the time it takes to travel 1 metre. The seed has a waterproof covering. Which of the following is a conclusion that can be drawn from this observation?

31.A graph shows the number of seeds germinating at different distances from a parent tree. The highest number germinates at 10 m, with numbers decreasing at greater distances. What does this suggest about seed dispersal?

32.Which of the following is an example of a seed dispersed by gravity?

33.Which of the following is an example of a seed dispersed by wind?

34.Which of the following is a method of seed dispersal?

35.True or false: Coconuts are an example of seeds dispersed by wind.

36.Which of the following adaptations helps a seed to be dispersed by wind?

37.A student investigates the effect of seed mass on wind dispersal distance. They drop seeds of three different masses from the same height in front of a fan at a fixed speed. The results are shown in the table: Seed mass (g) | Distance travelled (m) 0.2 | 3.5 0.5 | 2.1 0.8 | 1.3 Which conclusion is best supported by the data?

38.A student drops a seed from a height of 1.5 m in front of a fan. The seed takes 2 seconds to hit the ground and travels 3.0 m horizontally. What is the average horizontal speed of the seed?

39.A student counts the number of seedlings at different distances from a parent tree. The results are: Distance (m) | Number of seedlings 0-5 | 2 5-10 | 15 10-15 | 25 15-20 | 8 Which statement is correct?

40.Which of the following is a reason why seed dispersal is important for plants?

41.Coconuts are an example of seeds dispersed by wind.

42.Animal fur can carry seeds to new locations.

43.If many plants grow in the same location, they compete for resources.

44.Match each seed type to its dispersal mechanism.

45.Match each seed dispersal mechanism with the correct example.

46.Arrange the following steps in the correct order to describe how a seed is dispersed by explosive mechanism.

47.Which of the following are reasons why seed dispersal is important? (Select all that apply)

48.Which of the following seeds is most likely to be dispersed by wind?

49.Seeds with hooks or spines are adapted for water dispersal.

50.In an experiment to investigate wind dispersal, a student drops a maple seed from a height of 1 m in front of a fan. The seed travels 1.8 m horizontally before hitting the ground. The student then repeats the experiment with a dandelion seed. Which of the following would be the most likely distance travelled by the dandelion seed?

51.State four seed dispersal mechanisms.

52.Explain why it is necessary for seeds to be dispersed away from the parent plant.

53.Describe how maple seeds are adapted for dispersal.

54.Describe how seeds can be dispersed by water.

55.Name one adaptation of a seed that is dispersed by water.

56.In an experiment, a seed is dropped from a height of 1.5 m in front of a fan. It takes 1.5 seconds to hit the ground and travels 3.0 m horizontally. What is the average horizontal speed of the seed in m/s?

57.Complete the sentences about seed dispersal.

58.In a wind dispersal experiment, a seed is dropped from a height of 1.5 m in front of a fan. The seed takes 0.6 seconds to hit the ground and travels 2.4 m horizontally. Calculate the average horizontal speed of the seed in m/s.

59.Describe an experiment to investigate how effectively different types of seeds are dispersed by the wind.

60.Describe how animals can disperse seeds.

61.In an experiment, a seed is dropped from a height of 1.5 m in front of a fan. It takes 1.5 seconds to hit the ground and travels 3.0 m horizontally. What is the average horizontal speed of the seed in m/s?

62.In a wind dispersal experiment, a seed is dropped from a height of 1.5 m in front of a fan. The seed takes 0.6 seconds to hit the ground and travels 2.4 m horizontally. Calculate the average horizontal speed of the seed in m/s.