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- Some seeds (tomato, for example) had been germinated and the seedling grew for 2 weeks in soil, where the soil water potential was maintained at -0.2 bars. The plants were then divided into 5 groups and each group subjected to a different soil water potential as follows: Group 1: 0 bars Group 2: -0.03 bars Group 3: -0.2 bars Group 4: -3.0 bars Group 5: -5.0 bars At the end of three weeks at these various soil water potentials, the plants that would have made the least growth would be expected in which group? Question 11 options: Group 3 Group 1 Group 2 Group 4 Group 5Consider a soil with the following properties: The water content at the permanent wilting point is 0 = 5 Vol.% The actual plant available water accounts for 3 Vol.% The water content at saturation is 0,-38 Vol.% The water content at a suction of 10 cm is 35 Vol.% a) What is the field capacity of your soil? State the calculation, not only the result. b) What matric potential (suction) values do you assume for the wilting point and field capacity of your soil?What are the four components of the total water potential in a soil and what sign does each component have? What components of the total water potential most influence water flow in soil under unsaturated and saturated conditions?
- There are 1256 mg of BAP (MW: 225.25) in 500 mL of plant culture medium. Thus, what is the concentration of this phytohormone in terms of molarity in the medium?How would you assess leaf water potential? Explain the principle of the method and describe which factors could contribute to false or incorrect readings.Soil organic matter (SOM) samples have charge that is pH-dependent, and measurements for the cation-exchange capacities (CECS) of soil organic matter average around 150 cmol(+)/kg SOM at neutral pH. Meanwhile, smectite clay minerals have CECS that average approximately 100 cmol(+)/kg clay. Since these two phases are the dominant contributors to soil CEC, we can use SOM content and smectite content (if we can measure it) to estimate total soil CEC. What would be your estimate for the total CEC (in cmol(+)/kg soil, to the nearest 0.1 cmol(+)/kg soil) of a soil that contained 3.28 % SOM and 1.0 % smectite clay by weight?
- What are the low-cost alternative bagging materials to commercial fruit bags? How do they differ in terms of controlling insect pests like fruit fly in cucurbits?Name two soil properties that can affect infiltration rates. How does application rate affect infiltration? Why are infiltration rates typically higher in a sandy than in a clay soil?This apparatus was used by a student, in a brightly lit room, to measure the rate of water loss from a leafy shoot. He measured how far the bubble moved in five minutes. He measured this three times. The results are shown in the table. i. Measurement Distance moved by the bubble in cm 1 2 Table 9.1 3 11.9 12.6 13.0 Use these results to calculate the mean (average) rate of water loss in cm per minute. Show your working. cm per minute
- What are the major differences between a laminar flow and a biosafety cabinet? When do you use a Biosafety Cabinet? What are the different classes of Biosafety Cabinet?Scientists studied what caused leaf shedding in a drought deciduous (=shedding leaves during the dry season) subtropical species. They quantified the quantum yield (=efficiency) of the PSII complex and the leaf hydraulic conductance (=efficiency of leaf water movement) in leaves of that species during the wet to dry transition. Please describe the results in Figure Figure 1. Changes in leaf hydraulic conductance during the wet and dry season transition of a subtropical speciesThe following experiment was carreid out at ILC Laboratories to measure the effect of different nutrient solutions on bean root growth. Three nutrient solutions were made: 1.) A solution containing all required nutrients 2.) A solution containing all required nutrients except nitrogen; and 3.) distilled water. The results recorded for root length and leaf colour were as follows: Solution 1.) 47 mm; deep green Solution 2.) 17 mm; pale green-yellow Solution 3.) 14 mm; pale green-yellow a.) explain how the solution ranked in relation to the other two; b.) state the evidence that supports your answer; and c.) explain why the plant grew the way it did