Explanation:

 Statement 1: Buddhist relics are generally housed in Stupas. Viharas do not contain stupas, Chaityas do.
Statement 2: Viharas: To begin with, both Jaina and Buddhist monks went from place to place throughout the year, teaching people. The only time they stayed in one place was during the rainy season, when it was very difficult to travel. Then, their supporters built temporary shelters for them in gardens, or they lived in natural caves in hilly areas. As time went on, many supporters of the monks and nuns, and they themselves, felt the need for more permanent shelters and so monasteries were built. These were known as viharas. They do not contain stupas. Chaityas: Chaitya grihas or halls of worship were built all over the country either of brick or excavated from rocks. Both early Chaityas and Viharas were made by woods and later stone-cut Chaityas and Viharas were made. Chaitya was a rectangular prayer hall with a stupa placed in the centre, the purpose was prayer.