Match the following
| List - I | List - II | ||
|---|---|---|---|
| A. | cry II Ab | I. | Resistance to pest |
| B. | cry I Ab | II. | Control Bollworm |
| C. | RNAi | III. | Control corborer |
| D. | Bt cotton | IV. | Prevent nematode pathogen |


Find the variance of the following frequency distribution:
| Class Interval | ||||
| 0--4 | 4--8 | 8--12 | 12--16 | |
| Frequency | 1 | 2 | 2 | 1 |