Exam 36: Plant Nutrition

The ability for a plant's roots to obtain nutrients and oxygen from the soil is partly determined by a soil's texture. Texture describes which of the following soil components?

To understand the role of zinc in plant growth and development, you are growing a tomato plant using hydroponics. Which plant organs do you expect to have defects if you provide the plant with a solution devoid of zinc?

$\text {Elemental analysis of wild-type (WT)}$ $\text { and irt1-1 roots. Plants were grown in}$ \text { the presence ( + \mathrm { Fe } ) or absence \(( - \mathrm { Fe } )\)} $\text { of iron for 5 days. DW = dry weight}$ $( - \mathrm { Fe } )$ } \text { of iron for 5 days. DW = dry weight} Figure 36.2 -The IRT1 gene is responsible for most of the iron uptake activity in roots Vert et al., Plant Cell 14 [2002]:1223- 33). To determine the specificity of the IRT1 transporter in Arabidopsis plants, researchers measured the concentration of manganese, zinc, copper, and cobalt contained in wild- type and irt1- 1 mutant plants. What conclusions about IRT1 specificity can you draw from the above data? " class="answers-bank-image d-inline" loading="lazy" > Figure 36.2 -The IRT1 gene is responsible for most of the iron uptake activity in roots Vert et al., Plant Cell 14 [2002]:1223- 33). To determine the specificity of the IRT1 transporter in Arabidopsis plants, researchers measured the concentration of manganese, zinc, copper, and cobalt contained in wild- type and irt1- 1 mutant plants. What conclusions about IRT1 specificity can you draw from the above data?

Why do plants use cotransporters instead of ion channels to transfer anions into cells?

Which of the following is not true about an essential nutrient?

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?

What type of soil contains the highest amount of oxygen?

What is the charge on the inside of a plant cell plasma membrane?

Humus is comprised of which of the following components?

Researchers are interested in improving crop plants to enable them to form a symbiotic relationship with nitrogen- fixing bacteria. What genes would you need to transfer to a plant that does not associate with rhizobia to enable it to do so?

Both ectomycorrhizal fungi and rhizobia are able to supply plants with usable forms of nitrogen. From what sources do rhizobia and ectomycorrhizal fungi that are associated with plants obtain nitrogen?

Spanish moss, an epiphyte, obtains nutrients from which possible source?

Which criteria allow biologists to divide chemicals into macronutrients and micronutrients?

What major benefits do plants and mycorrhizal fungi receive from their symbiotic relationship?

What is the function of proton pumps localized in the plant plasma membrane?

After mutagenesis and screening take place, you have found a mutant that is able to grow in soil with high copper content. Protein analysis shows that the concentration of metallothioneins in the mutant is different from that in normal plants. How does the concentration of metallothioneins likely differ in the mutant relative to the normal plant?

A scientist observed a plant where only the young leaves are deteriorating. What nutrient is likely in short supply?

Soil leaching is usually

Which elements are most often the limiting nutrients for plant growth?

What is the right sequence of steps during infection of plants by nitrogen- fixing bacteria?