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Class 9 · Science
→A student finds a relationship between light intensity and plant growth. Which statement is correct when only correlation is observed?
Class 9 · Science
→Enzyme activity was measured at five temperatures. Which conclusion is worded most scientifically?
Class 9 · Science
→In a test only successful trials supporting the hypothesis were recorded while unsuccessful trials were omitted. What type of bias is this?
Class 9 · Science
→A student wrote that soap kills bacteria because fewer colonies appeared on a plate. Which additional control would most strengthen this conclusion?
Class 9 · Science
→What is the main purpose of randomly assigning plants to groups when comparing two fertilizers?
Class 9 · Science
→If an experimental sample is chosen only from fast runners what is the main limitation of the conclusion?
Class 9 · Science
→Which experimental plan would most reliably test whether exercise increases pulse rate?
Class 9 · Science
→A hypothesis states that adding salt raises the boiling point of water. What is the most appropriate independent variable?
Class 9 · Science
→In an experiment reaction time is measured using a mobile app. The app reads about (0.2) seconds too high in every measurement. What type of error is this?
Class 9 · Science
→A student says that all metals sink in water. What is the scientific weakness of this hypothesis?
Class 9 · Science
→In which situation would a null hypothesis be most appropriate?
Class 9 · Science
→While testing the effect of music on plant growth the plants were kept in different rooms. One room was also warmer. What type of problem is this?
Class 9 · Science
→In an experiment two groups are kept under the same conditions but only one group receives a new treatment. What is the untreated group called?
Class 9 · Science
→A student tests the effect of water temperature on the rate of sugar dissolving. Which result would most strongly support a causal relationship?
Class 9 · Science
→If experimental results do not support a hypothesis what should a scientist do first?
Class 9 · Science
→In an experiment the amount of fertilizer is changed and plant height is measured. Which factor is most essential to keep constant for a fair test?
Class 9 · Science
→Which hypothesis is most scientific for investigating the effect of temperature on seed germination?
Class 9 · Science
→A student hypothesizes that more light increases the rate of photosynthesis in an aquatic plant. Which is the best testable prediction?
Class 9 · Science
→How should temperature be kept while testing the effect of sound intensity on seed germination?
Class 9 · Science
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