IV. Short Answer Type – I   ( any Eight) :                                      8 X 2 = 16 30. What is irrigation?

31. What are the major groups of microrganisms?

32. Describe the characteristics of coke?

33. Give two example to show that plastics are non – corrosive in nature?

34. Define acid rain.

35. What is metamorphosis?

37.What are audible and inaudible sound?

38. Define cataract. please I give you brainlest and 16 point ​

Consider the linear model for a two-stage nested design with b nested in a as given below. yijk=\small \mu + \small \taui + \small \betaj(i) + \small \varepsilon(ij)k , for i=1,; j= ; k=1, assumption: \small \varepsilon(ij)k ~ iid n (0, \small \sigma2) ; \small \taui ~ iid n(0, \small \sigmat2 ); \tiny \sum_{j=1}^{b} \small \betaj(i) =0; \small \varepsilon(ij)k and \small \taui are independent. using only the given information, derive the least square estimator of \small \betaj(i) using the appropriate constraints (sum to zero constraints) and derive e(msb(a) ).