Exam 37: Plant Nutrition and Soils

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?

What makes a mineral element essential for plant growth?

Saline soils have a higher water potential than plant roots.

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

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

Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.

A plant with 80 available ATP could produce 10 molecules of NH₃.

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

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

The Nod factor is an important component of

Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare,many plants have symbiotic relationships with

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

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

Which of the following statements about plants grown in hydroponic culture is true?

Inside nitrogen-fixing nodules,one N₂ molecule is converted into two

A plant cell with 64 available ATP molecules could split how many N₂ molecules with the assistance of nitrogenase?

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

A magnesium deficiency would impact the light-independent reactions but not the light-dependent reaction of photosynthesis.

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

During the initiation of nitrogen-fixation nodules,a host plant with genetic mutations releases altered forms of flavonoids.What is the likely consequence of this?