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In a pondweed experiment investigating how light intensity affects the rate of photosynthesis, which structure is the site of photosynthesis in a plant cell? A) chloroplast B) mitochondrion C) nucleus D) ribosome
A student uses this apparatus to investigate the effect of light intensity on the rate of photosynthesis in pondweed.
This is the student’s method.
• put a cut piece of pondweed in a beaker of water...
A student uses this apparatus to investigate the effect of light intensity on the rate of photosynthesis in pondweed.
This is the student’s method.
• put a cut piece of pondweed in a beaker of water
• put a lamp 12 cm from the beaker
• count the number of bubbles of gas released from the cut end of the pondweed in one minute
• repeat this count for two more one-minute periods
The student repeats the method, moving the lamp 2 cm nearer the beaker each time.
This is the student’s method.
• put a cut piece of pondweed in a beaker of water
• put a lamp 12 cm from the beaker
• count the number of bubbles of gas released from the cut end of the pondweed in one minute
• repeat this count for two more one-minute periods
The student repeats the method, moving the lamp 2 cm nearer the beaker each time.
Answer
A) Chloroplast. Photosynthesis happens in chloroplasts, where chlorophyll absorbs light energy to make glucose and oxygen.
Explanation
What this question is really checking
Even though the context is a pondweed bubble-count experiment, this part is testing basic cell biology: which organelle carries out photosynthesis.
Match each organelle to its main job
- Chloroplast: site of photosynthesis, contains chlorophyll that absorbs light.
- Mitochondrion: site of aerobic respiration, releases energy (ATP) from glucose.
- Nucleus: contains DNA and controls cell activities.
- Ribosome: site of protein synthesis.
Picking the correct option
Because photosynthesis takes place in chloroplasts, the correct answer is A) chloroplast.
Why the pondweed produces bubbles
The bubbles counted in the experiment are oxygen gas ($O_2$), a product of photosynthesis, made in the chloroplasts when light intensity is sufficient.
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Skills You Achive
cell biology
organelles and their functions
photosynthesis
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