When Tradition Collides with Reason: Caste and Science in Modern India

On September 4, 2026, students at IIT‑Mandi gathered for the Krishna Janmashtami celebrations and, amidst the usual fanfare, a poster caught many eyes. It illustrated the four traditional varnas – Brahmanas, Kshatriyas, Vaishyas and Shudras – assigning each a fixed societal role: “spread God’s message,” “protect society,” “drive the economy,” and “serve higher classes,” respectively. At first glance the illustration looked like a harmless cultural reminder, but it quickly ignited a conversation that rippled through the campus and beyond.

India’s Constitution, drafted in the wake of a hard‑won independence, is explicit: every citizen, irrespective of birth, enjoys equal rights. The fundamental rights are attached to the person, not to an inherited function. This legal framework stands in stark contrast to the ancient text of Manusmṛti, which treats birth as a determinant of one’s destiny, prescribing a rigid division of labour and a set of permissible relationships. The two world‑views – constitutional equality and hereditary hierarchy – are, frankly, at odds.

Science, the very engine behind the technologies that IITs cherish, brings its own brand of authority. It does not appeal to moral dogma or historical precedent; it leans on empirical observation, repeatable experiments, and the willingness to revise theories when new data emerge. When some defenders of caste argue that the system reflects innate biological differences, they are, in fact, misunderstanding what biology and genetics really tell us.

Human development is a dialogue between genes and environment. Social discrimination – the kind embedded in caste – shapes access to nutrition, education, healthcare, and even exposure to stressors that can influence gene expression through epigenetic mechanisms. In other words, the very inequalities the caste system produces can alter biological outcomes, but they do not originate from an immutable genetic code. The causal arrow points the other way.

This nuance matters because it undermines the claim that caste is a natural order. If the hierarchy were truly rooted in biology, it would be evident across populations, not confined to particular societies with a long‑standing script. Moreover, scientific investigations into cognitive ability, creativity, or problem‑solving consistently show that socio‑economic factors – schooling, mentorship, resources – play a far larger role than any presumed hereditary trait.

Take the classroom as a microcosm. A student’s capacity to grasp thermodynamics or solve a differential equation is not pre‑ordained by the varna they are said to belong to. It is shaped by the quality of teaching they receive, the time they can devote to study, and the encouragement they get from peers and mentors. When a poster reduces individuals to static categories, it obscures the very dynamic, merit‑based process that science celebrates.

The controversy at IIT‑Mandi thus serves as a reminder: cultural symbols can be powerful, but they must be examined against the backdrop of contemporary values and evidence. The university’s leadership responded by investigating the poster’s origins, and several faculty members emphasized that scientific temper, as enshrined in the Constitution, demands a critical, questioning attitude toward any claim that lacks empirical support.

In everyday life, the tension between caste narratives and scientific reasoning plays out in subtle ways – from hiring practices to research collaborations. Bridging this gap requires more than just policy; it calls for a cultural shift where curiosity replaces fatalism, and where every student, irrespective of ancestry, is encouraged to pursue inquiry without pre‑conception of limitation.

Ultimately, the poster’s message – that each varna has a predetermined role – collides head‑on with the core of scientific thinking: that nature is open to discovery, that humans can rewrite their own story through knowledge and effort. The debate sparked at a single institute may well echo across the nation, nudging society a little closer to the constitutional promise of equality and the scientific promise of progress.