The nature of science, its aims, and scientific temper

What this heading covers

What kind of thing science is, and therefore what teaching it is for. Like the equivalent heading in mathematics, this looks like the philosophical corner of the paper and decides the rest of it: if science is a body of facts, then a well-explained lesson is good teaching. If it is also a method and an attitude, then a lesson in which nobody investigated anything has delivered a third of the subject.

Every option about activity, inquiry and questioning in the rest of the paper follows from the position taken here.

Science is three things at once

1. A body of knowledge — facts, concepts, principles, laws, theories.
2. A method — a way of arriving at that knowledge from evidence.
3. An attitude — curiosity, open-mindedness, insistence on evidence, willingness to be shown wrong.

The syllabus says plainly that school science which teaches only the first is teaching a third of the subject. It is worth being able to write that sentence, because a surprising number of questions are just it, rephrased.

The characteristics of scientific knowledge

Each with its classroom consequence, which is the part that earns marks rather than the list alone.

Characteristic	What it means	What follows for teaching
Empirical	Claims rest on observation and evidence	Children must handle evidence, not only hear conclusions
Tentative	It is the best account so far, and revisable	Present ideas as current understanding, not as final truth
Self-correcting	Error is found and corrected by the process itself	A wrong prediction is part of the method, not a failure
Objective, but done by people	It aims at objectivity through method and scrutiny; scientists have expectations	Replication and comparing records matter in class too
Universal	A result does not depend on who obtained it or where	Any child's careful result counts as much as the teacher's
Systematic and cumulative	Organised, and built on what came before	Sequence matters; a gap blocks what rests on it

Two more properties the paper sometimes names: scientific knowledge is testable — a claim that no observation could contradict is not a scientific claim — and it is public, in that findings are reported so others can check them.

Tentative does not mean unreliable

The distinction a question sets: that scientific knowledge can be revised does not make it a matter of opinion. It is the best-supported account available, held with confidence proportional to the evidence, and revisable if better evidence arrives. A candidate who writes that science "cannot be trusted because it keeps changing" has got the characteristic right and the meaning wrong.

Hypothesis, theory and law

The misconception the paper sets directly, often as assertion-and-reason.

Hypotheses do not "become" theories, and theories do not "become" laws. They are different kinds of statement, not ranks:

	What it is
Hypothesis	A testable proposed explanation, awaiting evidence
Theory	A well-substantiated explanation of some aspect of nature, supported by a large body of evidence
Law	A description of a regularity — often mathematical — stating what happens, not why

A theory explains; a law describes. They answer different questions, so neither can be promoted into the other.

The examples worth having ready:

• The theory of evolution will never become a law of evolution, however much evidence accumulates. It explains how diversity arose; there is no regularity for it to describe.
• The law of gravitation is not a promoted theory. It describes the attraction between masses; the theory of general relativity explains why.
• Boyle's law describes how pressure and volume vary together; the kinetic theory of gases explains why they do.

Note also that "theory" in science is nearly the opposite of its everyday sense. In ordinary speech a theory is a guess; in science it is the most heavily evidenced kind of explanation there is. A child who hears "it's only a theory" has met the everyday word.

Scientific temper

Worth knowing precisely because it is constitutional. Article 51A(h) makes it a fundamental duty of every citizen "to develop the scientific temper, humanism and the spirit of inquiry and reform". A question asking which article names scientific temper is asking for 51A(h).

Scientific temper is the habit of asking for evidence, suspending judgement where there is none, and revising a belief when the evidence changes — applied beyond the laboratory, which is the point.

The attributes the paper associates with it: curiosity, objectivity, open-mindedness, perseverance, scepticism in the sense of not accepting claims without evidence, honesty in reporting results — including results that spoil the expected answer — and freedom from superstition.

How it is taught, and how it is not

It is taught by practice rather than exhortation: by predictions being recorded before results, by unexpected results being investigated rather than quietly corrected, by the teacher saying "I don't know, how could we find out?", and by claims from any source being met with the same question.

It is not taught by ridiculing what children bring from home. The method is to ask how a claim could be tested, and this matters in an answer: a question offering "tell the children their family's belief is wrong" against "ask what evidence would settle it" wants the second.

Aims and objectives of teaching science

At the upper primary stage the syllabus expects science teaching to:

• Develop process skills — observing, classifying, measuring, predicting, inferring, hypothesising, experimenting, communicating.
• Build conceptual understanding rather than vocabulary.
• Nurture curiosity and the habit of asking questions.
• Develop scientific temper and resistance to unevidenced claims.
• Relate science to everyday life, health, technology and the environment.
• Develop concern for the environment and awareness of the social consequences of science.
• Develop psychomotor skills — handling apparatus, measuring, drawing.
• Develop a positive attitude towards science and confidence in doing it.

Two things to note. The aims span all three domains — knowledge, skill and attitude — which is why the evaluation heading insists on all three. And conceptual understanding is named against vocabulary: a child who can define photosynthesis and believes plants eat soil has met the vocabulary aim and failed the understanding one.

Understanding and appreciating science

A separately named heading, and it means more than enjoying the subject.

To understand science is to grasp how it works — that claims rest on evidence, that it proceeds by error and revision, that a theory is a well-supported explanation rather than a guess.

To appreciate it is to see it as a human activity: with a history, done by many kinds of people in many places, including a long Indian tradition — Aryabhata, Sushruta, Charaka, and in the modern period J. C. Bose, C. V. Raman, Meghnad Saha and Satyendra Nath Bose, several of them working in Bengal. It is also to see its consequences for society, which are not all benign, and that too is part of the appreciation the syllabus intends.

The practical difference: a learner who finds science interesting and a learner who finds it a list to be memorised have had different teaching, and this heading is where the paper asks which.

A question of the kind the paper sets

Assertion (A): A hypothesis becomes a theory and a theory becomes a law when enough evidence accumulates. Reason (R): Scientific knowledge is built up by the accumulation of evidence over time.

(a) Both A and R are true and R explains A (b) Both A and R are true but R does not explain A (c) A is false but R is true (d) Both A and R are false

(c).

R is true — scientific knowledge does accumulate, and is cumulative, which is one of its listed characteristics.

A is false, and this is the whole question. A theory and a law are different kinds of statement, not stages of seniority: one explains, the other describes. No amount of evidence converts an explanation into a description.

The item works because R is both true and plausible-sounding as a cause, so a candidate who reads quickly accepts A on R's strength. Assertion-and-reason items in this heading almost always put a true reason beside a false assertion for exactly that purpose — check the assertion on its own first.

Mistakes that cost marks here

• Saying a hypothesis becomes a theory becomes a law. The most-set error in science pedagogy.
• Calling a theory a guess, which imports the everyday meaning.
• Treating scientific knowledge as proved and final. It is tentative and self-correcting.
• Reading "tentative" as unreliable, which is the opposite error.
• Forgetting that science is also a method and an attitude when asked what it is.
• Attributing scientific temper to the wrong article. It is 51A(h).
• Proposing to ridicule a superstition. Ask what evidence would settle it.
• Listing aims from the cognitive domain only. Skills and attitudes are named aims.
• Treating "appreciating science" as enjoying it. It means seeing it as a human activity with a history and consequences.

In one line

Science is knowledge, method and attitude together; its knowledge is empirical, tentative, self-correcting and cumulative, which makes a wrong prediction part of the method rather than a failure; a theory explains and a law describes, so neither becomes the other; and scientific temper — a duty under Article 51A(h) — is taught by asking for evidence rather than by correcting beliefs.

In the classroom

The sentence that teaches the nature of science better than any definition is "I don't know — how could we find out?" A teacher who says it occasionally, and then does find out with the class, has demonstrated the method, the attitude and the tentativeness of knowledge in one move.

The second is treating an unexpected result as the interesting thing in the room rather than as something that went wrong. A class whose spoiled experiments get investigated learns that science self-corrects; a class whose spoiled experiments get quietly replaced with the textbook answer learns the opposite, whatever is written on the board.