Exemption for agricultural land capital gains extended to Hindu undivided families, subject to the existing reinvestment conditions. The amendment extends the capital gain exemption for transfers of land used for agricultural purposes so that where such land was used by the assessee or a parent in the two years before transfer and the capital gain is invested in purchase of agricultural land within two years, the exemption also applies where the assessee is a Hindu undivided family. The reinvestment and prior-use conditions continue to determine eligibility, and the change takes effect prospectively from the stated commencement.