Biology Grounding II

Which of the following is an example of a root exudate?

• Glomalin

• Oxalic acid

• N₂ gas

Which type of mycorrhizae would you expect to dominate in a peat bog environment (high soil organic matter content, cold, waterlogged, nutrient-poor)?

• Arbuscular

• Ecto

• Ericoid

Which would be an example of a rhizosphere effect?

• A difference in microbial community function within 2 mm of the root

• An increase in oxygen content within 1 cm of the root

• Roots physically weathering rock

A decrease in a plant's root:shoot ratio would likely be associated with what?

• A warming climate

• Increased water availability

• Decreased nutrient availability

Which of the following best describes the capability of root exudates to detoxify Al³⁺?

• It breaks down the Al³⁺ ions

• Some genotypes of some plants possess it

• It is most important in high-pH soils