Nature and meaning of science

The direct answer is B: examining evidence before accepting a claim. Scientific doubt is a careful, constructive habit. It does not mean being negative or refusing to believe anything; it means asking what evidence supports a statement, whether the method is reliable, and whether other explanations are possible. Step by step: someone makes a claim; the scientist does not accept or reject it immediately; they inspect observations, measurements, methods, and repeated results; then they form a conclusion that matches the available evidence. Option A, “opposing everything,” is wrong because science does not require automatic disagreement. Option B is correct because it describes questioning a claim responsibly before accepting it. Option C, “never drawing any conclusion,” is wrong; science can reach temporary, evidence-based conclusions, while remaining open to better evidence. Option D, “calling all experiments wrong,” is also unreasonable because well-designed experiments can provide useful knowledge. Scientific doubt improves accuracy and protects us from accepting rumours, bias, or unsupported statements. Memory cue: doubt asks “What is the evidence?”—it does not simply say “No.”

Clear evidence and repeatable results strengthen a discovery. Fame cannot replace scientific evidence.

Accepting an error and improving the method are parts of scientific honesty. Learning from errors advances science.

Preliminary research provides background and prior knowledge about a topic. It helps form a better question.

Instructions help ensure correct procedure and safe work. Read them before starting an experiment.

A conclusion answers the scientific question using the results. New evidence should not be invented in it.

A list of equipment helps in preparing and repeating the experiment. State required materials clearly.

The direct answer is option A: an observation is direct information, while a conclusion explains its meaning. An observation is something recorded through the senses or instruments, such as “the liquid temperature is 60°C” or “the plant grew 3 cm.” A conclusion is the reasoned statement drawn from such observations, such as “greater light may have supported growth.” The reasoning is: first collect or record what was seen or measured; then examine the evidence and explain what it suggests. Option A is correct because it separates evidence from interpretation. Option B is wrong because an observation and a conclusion have different jobs. Option C is wrong because observations normally come before conclusions; one should not decide the result first. Option D is wrong because observations should be based on evidence, including careful seeing or measurement. Memory cue: observation is “what happened”; conclusion is “what it means.”

Others' ideas may reveal new explanations and possible errors. The final decision should be based on evidence.

Collaboration means that two or more people work together while sharing ideas, tasks, and evidence. In science, different people may have different knowledge, technical abilities, experiences, or ways of viewing a problem. Combining these strengths can help a team plan a better investigation, notice mistakes, interpret results, and find solutions that one person might miss. Collaboration does not remove the need for experiments, and it should not involve hiding evidence or deciding results in advance.

For instance, one student may design the procedure, another may take careful measurements, and a third may organise the data. The group can then discuss whether the evidence supports its conclusion. This is why option C is correct: different skills and ideas come together. The other options describe secrecy, fixed results, or unnecessary experiments, none of which is a benefit of scientific teamwork.

The direct answer is D: record the result and check the conclusion against evidence. An expected result is encouraging, but it does not automatically prove that the explanation is true. Step by step: first write the observation honestly, including measurements and conditions; next compare it with the prediction; then examine whether the method was controlled and whether the result can be repeated; finally decide how strongly the evidence supports the conclusion. Option A, “leave it unrecorded,” is wrong because unrecorded work cannot be checked, compared, or used by others. Option B, “treat it as final truth,” is wrong because one matching result may be due to chance, measurement error, bias, or an incomplete explanation. Option C, “delete other results,” is scientifically dishonest and can hide important variation or error. Option D is correct because science requires transparent records and evidence-based evaluation, whether the result is expected or surprising. A prediction agreeing with an observation increases confidence, but repeated and carefully examined evidence is stronger. Memory cue: expected does not mean proved; record, repeat, and review.

The direct answer is option A: measurable terms make investigation and comparison clear. A scientific question should use words that can be observed or measured, such as time, mass, temperature, height, distance, or number. For example, “Does 10 minutes of sunlight affect plant height?” is clearer and more testable than “Does sunlight help plants a lot?” The reasoning is: a measurable term gives a definite quantity; a definite quantity can be recorded; recorded values can be compared; comparison allows an evidence-based conclusion. Option A is correct because measurable language makes the question specific and testable. Option B is wrong because measurable terms reduce vagueness rather than increase it. Option C is wrong because wording a question does not itself change the experimental result. Option D is wrong because measurement still requires evidence; it never removes that need. Memory cue: measurable questions can be tested, recorded, and compared.

The question about light and growth can be tested through measurement and experiment. Preference-based questions are not suitable for scientific investigation.

An unusual result may indicate either an error or a real change. First check the measurement and method.

Recording time helps understand the rate and sequence of change. Keep intervals equal in time-based investigations.

An evidence-based decision depends on tests and data. Do not treat advertisements or preferences as scientific evidence.

A scientific law describes a consistently observed relationship in nature. A law is different from personal opinion.

A scientific theory explains phenomena using a broad body of evidence. Do not confuse it with an ordinary guess.

A scientific theory can be revised on the basis of strong new evidence. Remember the revisable nature of science.

Limitations show the conditions within which an investigation is reliable. They are part of honest scientific reporting.

Scientific ethics emphasises safe and responsible work. Unnecessary harm to living beings and the environment should be avoided.

The direct answer is C: responsibility. Science is not only about discovering facts; it also requires using knowledge safely and considering its effects on people, animals and the environment. During an experiment, a responsible student uses only suitable amounts of materials, follows safety rules, prevents unnecessary pollution and disposes of waste correctly. Step by step, the student notices possible harm, chooses a safer method, handles materials carefully and cleans the work area without releasing dangerous waste. Option A is wrong because popularity is about being liked and is not a scientific value shown by environmental care. Option B is wrong because personal gain focuses on individual benefit, while environmental concern considers wider effects. Option C is correct because it names the duty to protect the environment and act safely. Option D is wrong because secrecy means hiding information; it is not the main value represented here. Scientific work should also be honest and open where appropriate, but this situation specifically tests responsibility. Memory cue: safe science protects both people and nature.

The result of one investigation can lead to new questions. Science is a continuous process of inquiry and improvement.

The direct answer is option A: asking questions, conducting experiments, and understanding evidence. Science is not only a list of definitions; it is a way of finding and checking explanations. A learner begins with a question, observes carefully, proposes an idea, tests it where possible, records results, and uses evidence to decide what the results mean. Option A is correct because it combines curiosity, practical investigation, and reasoning from evidence. Option B is wrong because memorising definitions can help with vocabulary, but definitions alone do not teach how to investigate or apply ideas. Option C is wrong because memorising answers without observation can produce a reply without understanding and cannot handle a new situation. Option D is wrong because avoiding experiments removes an important way to observe and test scientific ideas. Memory cue: learn science with “ask, test, observe, explain,” not with memory alone.

Science understands the natural world through evidence and systematic investigation. In meaning-based questions identify both process and evidence.