Which of the following statements is CORRECT? Question 3Select one: a. The root cells, which are not exposed to light, make carbohydrates using the dark reaction (Calvin cycle) of photosynthesis. b. In plants, root cells utilise organic carbon molecules absorbed from the soil to make ATP, rather than carbohydrates made via photosynthesis. c. For cellular work, macroalgae transports ATP directly from chloroplasts. d. For cellular work, macroalgae uses carbohydrates made in the chloroplasts to make ATP.
Question
Which of the following statements is CORRECT?
Question 3Select one:
a. The root cells, which are not exposed to light, make carbohydrates using the dark reaction (Calvin cycle) of photosynthesis.
b. In plants, root cells utilise organic carbon molecules absorbed from the soil to make ATP, rather than carbohydrates made via photosynthesis.
c. For cellular work, macroalgae transports ATP directly from chloroplasts.
d. For cellular work, macroalgae uses carbohydrates made in the chloroplasts to make ATP.
Solution
The correct statement is:
d. For cellular work, macroalgae uses carbohydrates made in the chloroplasts to make ATP.
Explanation:
a. The root cells are not involved in photosynthesis, including the dark reaction (Calvin cycle). This process occurs in the chloroplasts of the cells in the green parts of the plant, such as leaves, which are exposed to light.
b. Root cells do not absorb organic carbon molecules from the soil to make ATP. Instead, they absorb water and minerals. The ATP in plant cells is produced during photosynthesis in the chloroplasts, not in the roots.
c. ATP is not transported directly from the chloroplasts for cellular work. Instead, the energy stored in the form of ATP is used within the chloroplasts to synthesize carbohydrates, which can then be transported to other parts of the plant and used to produce ATP through cellular respiration.
d. This statement is correct. In macroalgae, as in other photosynthetic organisms, the carbohydrates produced in the chloroplasts during photosynthesis are used to produce ATP, the energy currency of the cell, through the process of cellular respiration. This ATP is then used for cellular work.
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