Exam 37: Soil and Plant Nutrition

For this pair of items,choose the option that best describes their relationship. I.the average size of particles that constitute silt II.the average size of particles that constitute clay

What soil(s)is (are)the most fertile?

Which of the following is a true statement about nitrogen fixation in root nodules?

How would you expect the root system of a plant grown by hydroponics to compare to the root system of a plant grown in soil? The root system of a plant grown by hydroponics would be

Two groups of tomatoes were grown under laboratory conditions,one with humus added to the soil and one a control without humus.The leaves of the plants grown without humus were yellowish (less green)compared with those of the plants grown in humus-enriched soil.The best explanation for this difference is that

A corn (Zea mays)mutant is developed that is deficient in magnesium uptake.The most likely phenotypic expression would be

Which of the following would be the most effective strategy to remove toxic heavy metals from a soil?

A farming commitment that embraces a variety of methods that are conservation-minded,environmentally safe,and profitable is called

Leghemoglobin is produced in some root nodules to

Most of the mass of organic material of a plant comes from

Which soil type or habitat would be least likely to have high populations of mycorrhizae?

In west Texas,cotton has become an important crop in the last several decades.However,in this hot,dry part of the country there is little rainfall,so farmers irrigate their cotton fields.They must also regularly fertilize the cotton fields because the soil is very sandy.The figure below shows the record of annual productivity (measured in kilograms of cotton per hectare of land)since 1960 in a west Texas cotton field.Use these data to answer the following questions. -Based on the information provided in the above figure,what is the most likely cause of the decline in productivity?

Epiphytes are

Reddish-purple colouring of leaves,especially along the margins of young leaves,is a typical symptom of deficiency of which element?

The enzyme complex nitrogenase catalyzes the reaction that reduces atmospheric nitrogen to

Rhizobia,actinomycetes,and cyanobacteria all share the common feature that they can

The NPK percentages on a package of fertilizer refer to the

For this pair of items,choose the option that best describes their relationship. I.the amount of nitrogen in a fertilizer marked "15-10-5" II.the amount of nitrogen in a fertilizer marked "15-5-5"

While hiking in a forest,you notice an unusual plant growing on the branches of a tree.What will help you to determine if this plant is epiphytic or parasitic?

An example of a mutualistic association between a plant and a fungus would be