SCIENCE
BIOLOGICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The zone of soil surrounding a plant root where the biology and chemistry of the soil are influenced by the plant root
|
|
|
Area of the cortex and endodermis of root where microorganisms can occupy spaces between cells and makes use of nutrients by roots
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Hiltner described the rhizosphere as the area around a plant root that is inhabited by a unique population of microorganisms influenced, he postulated, by the chemicals released from plant roots.
Detailed explanation-2: -The rhizosphere is the zone of soil surrounding a plant root where the biology and chemistry of the soil are influenced by the root. This zone is about 1 mm wide, but has no distinct edge.
Detailed explanation-3: -The rhizosphere has three zones (2, 9, 10)-the endorhizosphere, the rhizoplane and the ectorhizosphere (figure 1). 1. The endorhizosphere: This is the inner section of the rhizosphere. It is the section of the plant root occupied by micro organisms (which benefit from organic compounds released by roots).
Detailed explanation-4: -Most members of the rhizosphere microbiome are part of a complex food web that utilizes the large amount of nutrients released by the plant. Given that these rhizodeposits (e.g. exudates, border cells, mucilage) are a major driving force in the regulation of microbial diversity and activity on plant roots, Cook et al.
Detailed explanation-5: -The rhizosphere is a very dynamic environment where plants, soil, microorganisms, nutrients and water meet and interact. The rhizosphere differs from the bulk soil because of the activities of plant roots and their effect on soil organisms.