Photosynthesis And Leaf Structure

9.In an experiment to investigate the need for carbon dioxide in photosynthesis, a plant is placed in a bell jar with sodium hydroxide. What is the purpose of the sodium hydroxide?

10.Which labelled structure in the leaf cross-section is responsible for gas exchange?

11.Photosynthesis is the process by which plants manufacture carbohydrates from raw materials using energy from light.

12.Which gas is released as a waste product of photosynthesis?

13.Which mineral ion is required for the production of chlorophyll in plants?

14.In the starch test for photosynthesis, a leaf that has been exposed to light will turn blue-black when iodine is added because starch is present.

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

16.Match each leaf structure to its function.

17.The cuticle is a waxy layer on the upper epidermis of a leaf that helps reduce water loss.

18.Arrange the following steps in the correct order to test a leaf for starch: (A) boil leaf in ethanol, (B) add iodine, (C) boil leaf in water, (D) rinse leaf.

19.Which of the following are uses of glucose produced during photosynthesis? (Select all that apply)

20.The balanced chemical equation for photosynthesis is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

21.In the starch test for photosynthesis, why is the leaf boiled in ethanol?

22.A plant is kept in a sealed bell jar with sodium hydroxide for 24 hours in bright light. When a leaf is tested for starch, it remains orange-brown. What does this show?

23.What is the role of chlorophyll in photosynthesis?

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

25.A student investigates the effect of light intensity on the rate of photosynthesis in pondweed. They place a lamp at different distances from the beaker. Which variable should be kept constant?

26.Which of the following are uses of glucose produced during photosynthesis in plants? (Select all that apply)

27.Magnesium ions are required by plants for the production of chlorophyll.

28.Arrange the following steps in the correct order to test a leaf for starch, starting with the first step.

29.Which part of the leaf is primarily responsible for gas exchange?

30.A student uses a pH indicator (hydrogencarbonate) to investigate gas exchange in aquatic plants. They place leaves in a stoppered boiling tube with the indicator and expose it to light. After a few hours, the indicator turns purple. What does this indicate?

31.Which of the following is a correct adaptation of a leaf for photosynthesis?

32.Arrange the following steps in the correct order to demonstrate that light is needed for photosynthesis, starting with the first step.

33.A variegated leaf has areas of green and white. After exposure to light, the leaf is tested for starch. Which part of the leaf will turn blue-black?

34.In an experiment using hydrogencarbonate indicator to investigate gas exchange in aquatic plants, a tube containing leaves in the dark turns yellow. What does this indicate?

35.In an experiment to investigate the effect of light intensity on the rate of photosynthesis using pondweed, a student places a glass tank between the lamp and the beaker. What is the purpose of the glass tank?

36.A student investigates the effect of carbon dioxide concentration on the rate of photosynthesis in pondweed. They use four beakers containing different concentrations of sodium hydrogen carbonate. Which variable should they keep constant?

37.In the starch test for photosynthesis, the leaf is boiled in ethanol to kill the leaf.

38.In the hydrogencarbonate indicator experiment to investigate gas exchange in aquatic plants, a tube containing leaves in the dark turns yellow. What does this indicate?

39.Chlorophyll is the pigment that traps light energy for photosynthesis.

40.What is the waste product of photosynthesis?

41.Complete the sentence about chlorophyll.

42.State one use of glucose produced during photosynthesis in plants.

43.In the balanced chemical equation for photosynthesis, how many molecules of carbon dioxide are needed to produce one molecule of glucose?

44.Explain why a leaf from a plant kept in a bell jar with sodium hydroxide does not produce starch when tested with iodine.

45.In an experiment using pondweed, a student counts 24 bubbles of oxygen produced in 2 minutes. Calculate the rate of photosynthesis in bubbles per minute.

46.Complete the sentence: Chlorophyll is found in organelles called ___.

47.State one mineral ion required for plants and explain why it is needed.

48.In an experiment using pondweed, a student counts 30 bubbles of oxygen produced in 2.5 minutes. Calculate the rate of photosynthesis in bubbles per minute. Give your answer to one decimal place.

49.Describe how you would investigate the effect of carbon dioxide concentration on the rate of photosynthesis using pondweed.

50.Describe how you would investigate the effect of light intensity on the rate of photosynthesis using pondweed. Include a safety precaution.

51.Explain why a variegated leaf, when tested for starch after being exposed to light, shows only the green areas turning blue-black.

52.In the balanced chemical equation for photosynthesis, how many molecules of carbon dioxide are needed to produce one molecule of glucose?

53.In an experiment using pondweed, a student counts 24 bubbles of oxygen produced in 2 minutes. Calculate the rate of photosynthesis in bubbles per minute.

54.In an experiment using pondweed, a student counts 30 bubbles of oxygen produced in 2.5 minutes. Calculate the rate of photosynthesis in bubbles per minute. Give your answer to one decimal place.