Exam 38: Plant Nutrition and Soils

Inserting a cloned gene for a plasma membrane transporter into crop plants could lead to

Which of the following is most limiting for plant growth, especially in relation to the plant's carbon uptake?

Saline soils have a higher water potential than plant roots.

A primary advantage of using integrated nutrient management compared to inorganic chemical fertilizers is that

Certain plants have been genetically modified to secrete citrate, which helps

Plants can remove harmful chemicals from the soil by the process of

A deficiency of ammonia would inhibit the production of which of the following molecules?

If increased CO₂ concentrations result in plant tissue that is less nutritious, which of these is not a potential consequence for insect herbivores?

Which of these insectivorous plants does not use an active trapping mechanism?

Most parasitic plants like other land plants have mycorrhizal symbionts.

When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations, they abandon support of the nodules and end the symbiosis.Why?

Carnivorous plants evolved because which of the following nutrients is often extremely limited in their habitats?

Heavy metals in contaminated soils can be taken up by hyper-accumulating plants.Lead and cadmium taken up this way are often accumulated in the plants'

A parasitic plant without chlorophyll is likely to lack leaves.

Which of the following is required by plants in the smallest quantity?

Blocking the proton pumps in a root would result in a more negative membrane potential and an increase in K⁺ uptake.

In several studies of plant responses to elevated CO₂ concentrations in the atmosphere, scientists often found that the stimulation of growth gradually diminished because

In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis which is a yellowing of the leaves than younger leaves.What is the best explanation?

Why is it beneficial to plants that soil particles have negatively-charged surfaces?

Which of these is considered a potentially dangerous heavy metal contaminant in soil?