Read the passage and answer the questions:

The Indus Valley Civilisation is also called the Harappan culture. Archaeologists use the term "culture" for a group of objects, distinctive in style that are usually found together within a specific geographical area and period of time. In the case of the Harappan culture, these distinctive objects include seals, beads, weights, stone blades and even baked bricks. These objects were found from areas as far as Afghanistan, Jammu, Baluchistan and Gujarat. Named after Harappa, the first site where this unique culture was discovered, the civilisation is dated between c.2600 and 1900 BCE.

During the Harappan period, exchanges were regulated by a precise system of weights, usually made of _____?

Chert

The correct answer is Option (4) → Chert

During the Harappan period, exchanges were regulated by a precise system of weights, usually made of Chert.

During the Harappan period, exchanges were regulated by a precise system of weights, usually made of a stone called chert and generally cubical with no markings. The lower denominations of weights were binary (1, 2, 4, 8, 16, 32, etc. up to 12,800), while the higher denominations followed the decimal system. The smaller weights were probably used for weighing jewellery and beads. Metal scale-pans have also been found.