Which of the following fruit plants bear fruits twice a year
1. Cashew
2. Grape
3. Jack fruit
4. Pomegranate

Grape, jack fruit, and Pomegranate are fruit plants that bear fruits twice a year.
In North India, grape orchards bear two crops in a year resulting in exceptionally high yield, however, the fruit quality is not so good.
Jackfruit bears fruit during summer as well as during November-December. A mature jack tree produces some 200 fruits per year, with older trees bearing up to 500 fruits in a year.
The pomegranate produces fruit at the end of new growth. Judicious pruning annually for the first three years will produce bushy plants with abundant new growth each year.