Experiment: Two identical aquariums with fish were set up. One had aquatic plants, the other didn't. Oxygen levels were tested over 24 hours.Observation: Oxygen remained higher in the plant tank, especially during the day.Question: What does this suggest?
Correct answer: B. Aquatic plants release oxygen via photosynthesis.
- A. Fish produce more oxygen in isolation.
- B. Aquatic plants release oxygen via photosynthesis.
- C. Water itself creates oxygen.
- D. Plants consume all available oxygen.
Explanation
The correct answer is that aquatic plants release oxygen via photosynthesis. In the experiment, the aquarium with aquatic plants showed higher oxygen levels, especially during the day, indicating that the plants were releasing oxygen. The other options are incorrect, as fish do not produce oxygen, water itself does not create oxygen, and plants do not consume all available oxygen.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
Practise Scientific Reasoning
334 free Scientific Reasoning MCQs from Analytical and Logical Reasoning, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Analytical and Logical Reasoning questions like this
Analytical and Logical Reasoning is on 27 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Scientific Reasoning questions
Experiment: Lactic acid buildup was tested in athletes post-exercise using blood tests.Observation: High levels of lactic acid were found in those performing anaerobic exercises.Question: What does this confirm?
Experiment: An earthworm was cut into two segments. Only one half regenerated into a complete worm.Observation: The anterior half (head side) showed regeneration.Question: What biological process does this demonstrate?
Experiment: Chloroplasts were isolated and exposed to light with and without CO₂. ATP production was measured.Observation: ATP was produced with light even in the absence of CO₂.Question: What does this show?
Experiment: To study reflex action, a subject's knee-jerk response was tested after applying pressure to the thigh nerve.Observation: The reflex was immediate and involuntary.Question: Which conclusion is accurate?
Experiment: Mature red blood cells and white blood cells were placed in a hypotonic solution, and their structural integrity was observed over time.Observation: Red blood cells swelled and burst quickly, while white blood cells remained intact for a longer time.Question: What explains the observed difference?
Experiment: Chick embryos were incubated in sealed containers with varied oxygen levels (5%, 15%, 21%). Their growth was monitored for a week.Observation: Embryos in 21% oxygen developed normally, those in 5% showed poor growth and deformities.Question: What conclusion can be made?