could you help giving me explanation on these problems ? Thank you .

Question 7 Problem 3. To investigate the effect on potato yields of water loss due to transpiration, a horticulturist plans to use shade covers on plots at various stages of their growth and development. Plots will be shaded to Not yet reduce solar input (to the plants) by 0, 1/3, or 2/3. The three shadings will be applied to each of four different plots for a one-month period during "early" and "late" stages of growth. After the experiment, the difference between the yields at these two stages will be reported. The plots under consideration are scattered around a large region. Points out of 10.0 Which design would you recommend for this experiment? F Fag question O A Completely randomized design O B. Latin square design OF Randomize Complete Block Design O D. Factorial design with blocks Question 8 Regarding Problem 3. Let the treatment means for 0, 1/3, or 2/3 be denoted by my. /, and jus, respectively. Suggest two sensible contrasts to the experimenter. Not yet A (-2, 1. 1) Points out of 50 Flag question O B. (-1. -1,2) O C. (0.-1, 1) D. (-1,0, 1) DE. (-1.-1, 0)