Hypothesis and experimentation

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In Class 9 Science, within “Exploration: Entering the World of Secondary Science,” students learn how scientific questions can be turned into testable hypotheses. They examine the difference between an observation, an inference, and a prediction; identify variables and controls; plan fair experiments; and record evidence carefully. The topic develops skills in measuring, organizing data, interpreting results, recognizing sources of error, and drawing conclusions supported by evidence. Students also understand that experiments refine ideas rather than simply prove them.

Quiz this set

A student hypothesizes that more light increases the rate of photosynthesis in an aquatic plant. Which is the best testable prediction?

Which hypothesis is most scientific for investigating the effect of temperature on seed germination?

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?

If experimental results do not support a hypothesis what should a scientist do first?

A student tests the effect of water temperature on the rate of sugar dissolving. Which result would most strongly support a causal relationship?

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?

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?

In which situation would a null hypothesis be most appropriate?

A student says that all metals sink in water. What is the scientific weakness of this hypothesis?

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?

A hypothesis states that adding salt raises the boiling point of water. What is the most appropriate independent variable?

Which experimental plan would most reliably test whether exercise increases pulse rate?

If an experimental sample is chosen only from fast runners what is the main limitation of the conclusion?

What is the main purpose of randomly assigning plants to groups when comparing two fertilizers?

A student wrote that soap kills bacteria because fewer colonies appeared on a plate. Which additional control would most strengthen this conclusion?

In a test only successful trials supporting the hypothesis were recorded while unsuccessful trials were omitted. What type of bias is this?

Enzyme activity was measured at five temperatures. Which conclusion is worded most scientifically?

A student finds a relationship between light intensity and plant growth. Which statement is correct when only correlation is observed?

In a medicine test participants are not told whether they received the real medicine or an inactive pill. What is the main purpose?

The hypothesis is that a higher acid concentration makes a reaction faster. Which measurement is most suitable as the dependent variable?

Which hypothesis can be shown false by an experiment?

If every group in an experiment receives a different amount of water and a different amount of fertilizer what is the main problem?

Which option would most improve the precision of measurement?

An experiment gives results of (12.1) cm (12.0) cm and (12.2) cm while the true value is (15.0) cm. How should these measurements be described?

A student concludes that a new drink improves memory because the treatment group had a higher mean score. Which information is most necessary to evaluate the conclusion?

Quiz result

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Hypothesis and experimentation

Quiz this set

In which situation would a null hypothesis be most appropriate?किस स्थिति में शून्य परिकल्पना सबसे उपयुक्त होगी?

Which hypothesis can be shown false by an experiment?किस परिकल्पना को प्रयोग द्वारा गलत सिद्ध किया जा सकता है?

Which option would most improve the precision of measurement?किस विकल्प से मापन की परिशुद्धता सबसे अधिक बढ़ेगी?

Quiz result

Analytics choices

In which situation would a null hypothesis be most appropriate?

Which hypothesis can be shown false by an experiment?

Which option would most improve the precision of measurement?