Match the following
| List - I | List - II | ||
|---|---|---|---|
| A. | Enrich nutrient quality of soil | I. | Bioreactor |
| B. | Kill insect pest | II. | Biogas |
| C. | Decomposition of dung to produce gas | III. | Bio fertilizers |
| D. | Growth of large no. of microbes on Industrial scale | IV. | Bio pesticides |




Which of the following microbes is NOT involved in the preparation of household products?
A. \(\textit{Aspergillus niger}\)
B. \(\textit{Lactobacillus}\)
C. \(\textit{Trichoderma polysporum}\)
D. \(\textit{Saccharomyces cerevisiae}\)
E. \(\textit{Propionibacterium sharmanii}\)
Find the variance of the following frequency distribution:
| Class Interval | ||||
| 0--4 | 4--8 | 8--12 | 12--16 | |
| Frequency | 1 | 2 | 2 | 1 |