Describe why flooding causes yield loss or death in plants
What will be an ideal response?
•The primary reason that flooding and very wet soil damage plants is their impact on respiration, the oxygen-dependent process by which plant cells convert energy for maintenance, and active uptake of nutrients. Flooding fills soil pores with water and prevents oxygen diffusion to plant roots. In the absence of respiration, carbon dioxide and other compounds like ethanol and butyric acid accumulate near roots. Consequently, plant roots become nonfunctional and ultimately die.
•Without functioning roots, plants cannot take up water (even though the root may be submerged) or nutrients for transport to the shoot. Legumes like soybean and alfalfa suffer nodule delay and lose the capacity for biological nitrogen fixation.
•Wet soils have a greater incidence soil-borne, root and crown diseases including Phytophthora spp. and Pythium spp.
•Saturated and flooded soils can lead to loss of nitrogen fertilizers from the plant root zone. This is detrimental to annual crops like corn and small grains that depend on nitrogen fertilization for high yields.
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Which of the following strategy types avoids long-term commitment to any single
technology, is highly decentralized, and has a propensity to take risk?
a. Prospector b. Defender c. Analyzer d. Reactor e. Aggressor
Because retail supermarket corporations operate on a low ROR, it is common to use a market MARR of about 3% per year. What real return rate is implied from a market interest rate of 3% per year when the annual inflation rate is 4% per year? Explain your answer.
What will be an ideal response?
A vehicle battery is consistently low on voltage. Technician A says to disconnect the battery with the engine running to test for alternator output. Technician B says that a loose alternator belt may cause this problem. Who is right?
A) A only B) B only C) Both A and B D) Neither A nor B
The only members of the design team should be designers and drafters.
Answer the following statement true (T) or false (F)