Life processes and unicellular organisms

9.Euglena is a unicellular organism that can photosynthesise. Which organelle allows it to do this?

10.Which of the following is NOT a life process according to MRS GREN?

11.Which of the following statements about bacteria is true?

12.A student observes a unicellular organism under a microscope. It has a flagellum and chloroplasts. Which organism is it most likely to be?

13.A student investigates the effect of temperature on the growth of yeast. The results are shown in the table. At which temperature did yeast grow the most?

14.A culture of bacteria is placed in a solution with a high concentration of antibiotic. After 24 hours, the number of living bacteria is counted. Which graph shows the expected change in the number of living bacteria over time?

15.A unicellular organism lives in a pond. It has no chloroplasts and feeds on other microorganisms. Which life process does this organism carry out to obtain food?

16.Which of the following is a waste product that must be excreted by unicellular organisms?

17.A student measures the rate of respiration in yeast at different temperatures. The results are shown in the bar chart. Which temperature gives the highest rate of respiration?

18.A biologist observes a unicellular organism under a microscope. It moves by extending its cell membrane and flowing forward. Which organism is it most likely to be?

19.Which of the following life processes is most directly involved when a unicellular organism moves towards a light source?

20.All living organisms carry out respiration. What is the main purpose of respiration?

21.A scientist cultures two species of bacteria: one with a flagellum and one without. Both are placed in a liquid medium with nutrients. After 24 hours, the species with a flagellum is found in higher numbers. Which life process does the flagellum help with?

22.A student observes a unicellular organism under a microscope. It has no nucleus but has a flagellum. Which organism is it most likely to be?

23.A scientist cultures two species of bacteria: one with a flagellum and one without. Both are placed in a liquid medium with nutrients. After 24 hours, the species with a flagellum has spread throughout the container, while the other remains near the initial spot. This observation best demonstrates which life process?

24.A student sets up an experiment to measure the rate of respiration in yeast at different temperatures. Which piece of equipment would be most suitable to measure the rate of respiration?

25.Which of the following statements about bacteria is correct?

26.A student uses a microscope to observe a sample of pond water. She sees a unicellular organism that contains chloroplasts and a flagellum. Which life process is this organism able to carry out that a bacterium without chloroplasts cannot?

27.In an experiment, a student adds a drop of pond water containing euglena to a dish with a light source at one end. After 10 minutes, most euglena are near the light. This response is an example of which life process?

28.A student observes a unicellular organism from pond water. It has a flagellum and can photosynthesise. Which organism is it most likely to be?

29.In an experiment, a student adds a drop of pond water containing euglena to a dish with a light source at one end. After 10 minutes, most euglena are near the light. Which life process does this behaviour illustrate?

30.A scientist cultures two species of bacteria: one with a flagellum and one without. Both are placed in a liquid medium with nutrients. After 24 hours, the species with a flagellum has a larger population. Which is the most likely explanation?

31.A student measures the rate of respiration in yeast at different temperatures. The results are shown in the bar chart. Which temperature gives the highest rate of respiration? (Assume the bar chart shows: 10°C: 2 bubbles/min, 20°C: 4 bubbles/min, 30°C: 6 bubbles/min, 40°C: 5 bubbles/min)

32.A student sets up an experiment to measure the rate of respiration in yeast at different temperatures. Which piece of equipment would be most suitable to measure the volume of carbon dioxide produced?

33.A student uses a microscope to observe a sample of pond water. She sees a unicellular organism that contains chloroplasts and a flagellum. Which life process is the flagellum primarily used for?

34.A student investigates the effect of temperature on the growth of yeast. The results are shown in the table. At which temperature did yeast grow the most? (Table: 15°C: 2 colonies, 25°C: 5 colonies, 35°C: 8 colonies, 45°C: 3 colonies)

35.A culture of bacteria is placed in a solution with a high concentration of antibiotic. After 24 hours, the number of living bacteria is counted. Which graph shows the expected change in the number of living bacteria over time? (Assume the correct graph shows a rapid decrease then plateau; distractors show increase, no change, or gradual increase)

36.A student observes a unicellular organism from pond water under a microscope. It has a flagellum and chloroplasts. Which organism is it most likely to be?

37.A student sets up an experiment to investigate the effect of temperature on the growth of yeast. They prepare five test tubes with the same volume of sugar solution and add the same mass of yeast to each. The tubes are placed at different temperatures for 24 hours. Which of the following should the student measure to determine the amount of growth?

38.A scientist cultures two species of bacteria: one with a flagellum and one without. Both are placed in a liquid medium with nutrients. After 24 hours, the species with the flagellum is found in higher numbers throughout the medium, while the other species is concentrated at the bottom. Which life process best explains this difference?

39.A student uses a microscope to observe a sample of pond water. She sees a unicellular organism that contains chloroplasts and a flagellum. Which life process is this organism carrying out when it uses its flagellum to swim towards light?

40.In an experiment, a student adds a drop of pond water containing euglena to a dish with a light source at one end. After 10 minutes, most euglena are near the light. Which two life processes are demonstrated by this behaviour?

41.There are seven life processes that all living organisms perform.

42.Unicellular organisms are living organisms made of more than one cell.

43.All living organisms carry out respiration.

44.All living organisms carry out photosynthesis.

45.Bacteria are an example of a unicellular organism.

46.Bacteria contain a nucleus.

47.A unicellular organism has a flagellum and chloroplasts. Which life process is most directly supported by the flagellum?

48.Match each life process (left) with its correct description (right).

49.Put the following statements in the correct order to describe how a euglena responds to light:

50.Which of the following are examples of unicellular organisms? (Select all that apply)

51.Fill in the blank.

52.State all seven life processes that living organisms perform.

53.State three examples of unicellular organisms.

54.State two organelles that bacteria have and describe the purpose of each.

55.Complete the sentence using the correct terms.

56.A student observes a euglena under a microscope. The euglena is 0.05 mm long. How many micrometres (µm) is this?

57.State three organelles that euglena has and describe the purpose of each.

58.A student observes a euglena under a microscope. The euglena is 0.05 mm long. How many micrometres (µm) is this?