Nature and meaning of science

The direct answer is option B: recording results accurately. Scientific honesty means reporting what the experiment actually shows, including results that do not support the expected idea. First observe carefully, then write measurements truthfully, keep units and conditions clear, and do not remove inconvenient readings. For example, if three trials give different values, all relevant readings and a fair summary should be recorded rather than selecting only the favourable one. Option A is wrong because recording only successful results hides evidence and gives a misleading picture. Option B is correct because accurate records allow other people to understand, repeat, and check the work. Option C is wrong because invented data are false and cannot be evidence. Option D is wrong because conclusions must follow the evidence, not personal preference. A useful exam cue is: scientific honesty means truthfully recording data, not making the data fit the expected answer.

An opposite result is also scientific evidence and may show that the hypothesis needs revision. Accept results honestly.

Peer review is when knowledgeable scientists examine research before it is accepted or shared widely. Their comments can help identify errors and improve the work, so option D is correct.

Evidence is information obtained through observation or experiment that supports a claim. Remember the difference between evidence and opinion.

A scientific attitude allows ideas to change on the basis of new evidence. Being open-minded is important.

Science is not merely a collection of facts but a process of building knowledge through questions and evidence. Focus on the word process.

Comparison reveals differences and similarities among objects or results. Look for similar conditions in comparison questions.

The direct answer is A: classification means grouping objects according to similar properties. Scientists first observe features such as structure, material, size, living characteristics or behaviour. They then compare those features and place objects with common features in the same group. This makes a large amount of information organised, easier to identify, compare and study. Classification can be changed if better observations or evidence become available. Option A is correct because it states the central purpose of classification. Option B is wrong because classification uses and makes properties clearer; it does not hide them. Option C is wrong because classification creates useful groups rather than removing all groups. Option D is wrong because scientific classification should be based on observation and evidence, not on giving names without studying the objects. For example, animals may be grouped by shared features, while materials may be grouped as metals and non-metals according to their properties. Memory cue: observe similarities, compare differences, then group systematically.

A prediction states a likely outcome using available evidence and knowledge. It is not a random guess.

A scientific prediction is based on evidence and prior knowledge. An unsupported statement is an ordinary guess.

Technology provides better tools and measurement facilities to scientists. Science and technology support each other.

A microscope enlarges very small objects for observation. Remember to match each instrument with its use.

The direct answer is option B: to prevent accidents and harm. A scientific investigation may involve heat, glass, chemicals, electricity, sharp tools, or biological materials, so students must follow instructions, use suitable protection, handle equipment correctly, and report danger. Safety rules protect people as well as apparatus and samples. Option A is wrong because safety procedures are not designed to change results; careless behaviour can instead make results unreliable. Option B is correct because the main purpose is to reduce injury, damage, spills, burns, and other hazards. Option C is wrong because making an experiment longer is not a safety aim, although careful preparation may sometimes take extra time. Option D is wrong because hiding equipment is unsafe and prevents proper use and checking. A good exam cue is: before an experiment, read instructions, identify hazards, and use the required safety equipment.

Data are information collected through observations and measurements. Conclusions are formed by analysing them.

A table arranges data in rows and columns, making values easier to read, compare and use to identify patterns. It does not change the results, so option B is incorrect. Exam tip: Always check the table heading, units, and row-column labels.

Studying cause and effect helps understand relationships between events. Identify the changed factor and the outcome.

Clearly identifying the problem helps determine a suitable question and investigation. Understand the problem before seeking a solution.

Scientific language should be clear and precise so information is understood correctly. Difficult words are not always necessary.

A scientific result should be supported by observations and measurements. A result without evidence is not considered reliable.

Asking questions is the starting point of scientific thinking. A question identifies something we want to understand, measure, or explain. It changes simple curiosity into a clear problem that can be investigated. Scientific questions are useful when they are specific enough to examine with observations, measurements, or experiments. They do not stop knowledge, remove the need for experiments, or weaken evidence; instead, they guide the search for evidence.

For example, asking why a plant grows faster in one condition can lead to a prediction and a fair test. Scientists then collect observations, compare results, and improve the question if needed. Thus, option A is correct because questions begin investigations and may lead to discoveries. The other choices describe effects opposite to the purpose of scientific inquiry.

Scientific knowledge helps solve practical problems in society. Health and environment are common examples.

Curiosity and continuous investigation are important in scientific discovery. Depending only on chance is not enough.

The direct answer is D: others can examine and use the shared scientific knowledge. Science grows through communication. A scientist reports the method, observations, measurements, and conclusions so that other people can study them, repeat the work where possible, identify errors, apply the result, or build a new investigation. Step by step, sharing makes knowledge visible; examination makes it more reliable; use and further testing help new knowledge develop. Option A is wrong because sharing normally supports scientific work rather than stopping it. Option B is wrong because sharing does not end all questions; it often creates better questions for future study. Option C is wrong because evidence does not decrease when it is communicated; clear sharing can make evidence easier to inspect, although poor reporting can create confusion. Option D is correct because examination and practical use are major ways science progresses. This does not mean every shared claim is automatically true; it must still be checked. Memory cue: communicate, check, apply, improve.

An unsuccessful experiment also provides useful information and helps find a better method. Record every result.

Science understands nature through observation experimentation and reasoning. This is a basic feature of science.