According to IS:3629-1986, the trade names and the botanical names of trees are given as options. Select the correct option in which the timbers of these trees are used for permanent structures.
DSSSB JE - 2023,
Answer: D
IS 3629-1986 groups the structural timbers by their suitability. The fourth option lists deodar, teak, Indian rosewood and sal, the group of timbers recommended for permanent structures, since they are strong, durable and resistant to decay. The other options include casuarina, kasod, satinwood and ebony, which are not in this list of timbers for permanent structures, and so mix in species that suit other uses.
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