Exam 37: Soil and Plant Nutrition

For this pair of items, choose the option that best describes their relationship. (A)The amount of nitrogen in a fertilizer marked "15-10-5" (B)The amount of nitrogen in a fertilizer marked "15-5-5"

Some of the problems associated with intensive irrigation include all but

Epiphytes are

Hyphae form a covering over roots. These hyphae create a large surface area that helps to do which of the following?

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

Iron deficiency is often indicated by yellowing in newly formed leaves. This suggests that iron

In what way do nitrogen compounds differ from other minerals needed by plants?

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. Figure 37.2 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. Figure 37.2 -If you were the county agriculture agent, what would be the best advice you could give the farmer who owns the field under study in Figure 37.2?

You are weeding your garden when you accidentally expose some roots of your pea plants. You notice swellings (root nodules)on the roots and there is a reddish tinge to the ones you accidentally damaged. Most likely your peas plants

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

The earliest vascular plants on land had underground stems (rhizomes)but no roots. Water and mineral nutrients were most likely obtained by

A greenhouse experiment to test growth rates in tomato cultivars was conducted using sterile soil mix and watering with sterile solutions of water and fertilizer. Following germination, half of the plants in each group were transplanted into soil that was obtained from a nearby agricultural field (nonsterile), the other half into sterile soil. After several weeks the plants that were transplanted into nonsterile soil exhibited a much higher growth rate compared to the plants transplanted into sterile soil. The most likely explanation for this result is

For this pair of items, choose the option that best describes their relationship. (A)The amount of molybdenum in a gram of dried plant material (B)The amount of sulfur in a gram of dried plant material

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

When comparing a developing leaf with a fully mature leaf, the developing leaf will have

The most efficient way to increase essential amino acids in crop plants for human consumption would be to

In the 1640s Jan Baptista van Helmont planted a small willow in a pot that contained 90.9 kg of soil. After five years, the plant weighed 76.8 kg, but only 0.06 kg of soil had disappeared from the pot. What did van Helmont conclude from this experiment?

A farmer noted that many of his tomato fruits turned brown at the base as they ripened. The following spring when he replanted, seedlings only grew for a few weeks before the apical tips of many of the plants turned brown and the plants ultimately died. The most likely explanation for this observation is a soil deficiency in

Which of the following, if used as a fertilizer, would be most immediately available for plant uptake?

Plant roots can enhance the availability of mineral nutrients for uptake by