Photosynthesis

9.Euglena is a unicellular organism that carries out photosynthesis. Which organelle must it contain?

10.How does carbon dioxide enter the leaf?

11.What is the advantage of palisade cells being located near the top of a leaf?

12.In the pondweed experiment to measure the effect of light intensity, which variable should be changed?

13.In an experiment using pondweed, a student counts 20 bubbles of oxygen released in one minute at a light intensity of 40 units. When the light intensity is increased to 80 units, 35 bubbles are released in one minute. What is the percentage increase in the rate of photosynthesis?

14.A student uses pondweed to investigate the effect of carbon dioxide concentration on the rate of photosynthesis. They add sodium hydrogen carbonate to the water to increase carbon dioxide concentration. Which of the following is the most appropriate way to measure the rate of photosynthesis in this experiment?

15.The graph shows the rate of photosynthesis at different light intensities for a plant. At point X, the rate stops increasing despite higher light intensity. What is the most likely limiting factor at point X?

16.A plant is kept in a sealed container with a carbon dioxide sensor. The plant is placed in bright light. Which of the following graphs best shows how the carbon dioxide concentration changes over time?

17.Which of the following is the correct word equation for photosynthesis?

18.A student sets up three test tubes of pondweed: Tube A at 10°C, Tube B at 25°C, Tube C at 40°C. All other conditions are the same. After 10 minutes, the number of oxygen bubbles counted is: A=5, B=20, C=8. What conclusion can be drawn?

19.In a pondweed experiment, a student uses a lamp at different distances to vary light intensity. At 10 cm distance, 30 bubbles per minute are counted. At 20 cm, 15 bubbles per minute. At 30 cm, 7 bubbles per minute. What is the relationship between light intensity and rate of photosynthesis?

20.Which of the following is a product of photosynthesis?

21.The diagram shows a cross-section of a leaf. Which layer contains the most chloroplasts?

22.In the chloroplast diagram, what is the name of the fluid-filled space where the Calvin cycle occurs?

23.A student investigates the effect of light intensity on photosynthesis using pondweed. They use a lamp and change its distance from the pondweed. Which of the following should they keep constant?

24.A plant is placed in a sealed transparent container with a light source. The carbon dioxide concentration inside is measured over time. Initially, the concentration is 0.04%. After 2 hours, it is 0.02%. What is the average rate of carbon dioxide uptake per hour?

25.In the pondweed experiment described, which apparatus is used to collect the oxygen produced?

26.A student wants to investigate the effect of light intensity on the rate of photosynthesis using pondweed. Which variable should they change?

27.In a pondweed experiment, a student counts 20 bubbles of oxygen per minute at a light intensity of 40 arbitrary units. When the light intensity is increased to 80 units, the bubble count rises to 35 per minute. What is the most likely explanation for the rate not doubling?

28.Which of the following is a correct method to vary carbon dioxide concentration in a pondweed experiment?

29.What is the role of chlorophyll in photosynthesis?

30.A student sets up three test tubes of pondweed: Tube A at 10°C, Tube B at 25°C, Tube C at 40°C. All other conditions are the same. After 10 minutes, the number of oxygen bubbles is recorded. Which tube is expected to have the highest bubble count?

31.Which gas enters the leaf through stomata for photosynthesis?

32.Why do leaves have a large surface area?

33.A plant is kept in a sealed transparent container with a light source. The carbon dioxide concentration inside is measured over time. Initially, the concentration decreases, then levels off. What does the leveling off indicate?

34.In the leaf cross-section, which layer contains loosely arranged cells with air spaces to allow gas movement?

35.The diagram shows a chloroplast. Which part is the site of the light-dependent reactions?

36.Which of the following statements is true?

37.Which organelle must a unicellular organism contain to carry out photosynthesis?

38.Why is it advantageous that palisade cells are found near the top of a leaf?

39.How does carbon dioxide enter the leaf to reach the palisade cells?

40.Which of the following is NOT a factor that affects the rate of photosynthesis?

41.Photosynthesis is a chemical reaction that produces glucose.

42.Plants do not carry out respiration.

43.Photosynthesis occurs in chloroplasts.

44.Palisade cells contain many chloroplasts.

45.What is the green pigment found in chloroplasts that absorbs light for photosynthesis?

46.Which part of a leaf do gases move through to enter or leave the leaf?

47.Match each part of the leaf to its function.

48.Place the following steps in the correct order to describe how carbon dioxide reaches palisade cells for photosynthesis.

49.Which of the following are factors that affect the rate of photosynthesis? (Select all that apply)

50.Which gas is produced during photosynthesis?

51.Complete the sentence.

52.Complete the word equation for photosynthesis.

53.State three factors other than light intensity that affect the rate of photosynthesis.

54.Euglena is a unicellular organism that carries out photosynthesis. Name the organelle it must contain.

55.State why it is an advantage that palisade cells are generally found near the top of a leaf.

56.In a pondweed experiment, a student counts 30 bubbles per minute at a light intensity of 50 arbitrary units. When the light intensity is increased to 100 units, the bubble count rises to 60 per minute. Assuming the relationship is proportional, how many bubbles per minute would be expected at 75 units?

57.Describe the movement of carbon dioxide from the air into the palisade cells.

58.Describe how you would investigate the effect of light intensity on the rate of photosynthesis using pondweed. Include how you would change the light intensity and what you would measure.

59.In a pondweed experiment, a student counts 30 bubbles per minute at a light intensity of 50 arbitrary units. When the light intensity is increased to 100 units, the bubble count rises to 60 per minute. Assuming the relationship is proportional, how many bubbles per minute would be expected at 75 units?