1. An advantage of organic fertilization over chemical fertilization is that they
a. are more natural
b. release their nutirents over a longer priod of time and are less likely to lost to runoff.
c. provide nutrients in the forms most readily absorbed by plants
d. are easier to mass produce and transport
e. are all of the above
2. Place these steps in the sequence or root nodule formation in proper order:
1. production of infection thred through which bacteria enter root
2. secretion of flavonoids by root
3. continuation of nodule growth and connection to vascular stele of root.
4. actication of Nod D, with turns on bacterial nod genes.
5. activation of plant early nodulin genes by bacterial Nod factors
6. bacteria wrapped in vasicles in cortical cellss, becoming bacteriods
a. 3,5,6,1,4,2
b. 2,4,5,1,6,3
c. 2,1,4,5,6,3
d. 5,4,2,1,3,6
e. 1,2,4,5,6,3
3. Nitrogenase
a. is an enzyme complex that reduces atmospheric nitrogen to ammonia
b. is found in Rhizobium and other nitrogen fixing bacteria
c. catalyzes the energy-expensive fixation of nitrogen
d. provides a model for chemical engineers to design catalysta to make nitrogen fertilizers
e. is or does all of the above.
4. Which of the following is an example of phytoremediation?
a. dusting legume seeds with spores of Rhizomium to increase nodule formation
b. inoculating seeds with fungal spores to ensure mycorrhizal formation
c. using plants to remove toxic heavy metals from contaminated soils
d. genetic engineering of plants to increase protein content
e. seeding the ocean with iron to create algal blooms that reduce atmospheric CO2 levels.
5. Negatively Charged Minerals
a. are released from clay paticales by cation exchange
b. are reduced by cation exchanged before they can be absorbed
c. are converted into amino acids before they are transported through the plant
d. are bound when roots release acids into the soils
e. are leached away by the action of rainwater more easily than positively charged minerals.
a. are more natural
b. release their nutirents over a longer priod of time and are less likely to lost to runoff.
c. provide nutrients in the forms most readily absorbed by plants
d. are easier to mass produce and transport
e. are all of the above
2. Place these steps in the sequence or root nodule formation in proper order:
1. production of infection thred through which bacteria enter root
2. secretion of flavonoids by root
3. continuation of nodule growth and connection to vascular stele of root.
4. actication of Nod D, with turns on bacterial nod genes.
5. activation of plant early nodulin genes by bacterial Nod factors
6. bacteria wrapped in vasicles in cortical cellss, becoming bacteriods
a. 3,5,6,1,4,2
b. 2,4,5,1,6,3
c. 2,1,4,5,6,3
d. 5,4,2,1,3,6
e. 1,2,4,5,6,3
3. Nitrogenase
a. is an enzyme complex that reduces atmospheric nitrogen to ammonia
b. is found in Rhizobium and other nitrogen fixing bacteria
c. catalyzes the energy-expensive fixation of nitrogen
d. provides a model for chemical engineers to design catalysta to make nitrogen fertilizers
e. is or does all of the above.
4. Which of the following is an example of phytoremediation?
a. dusting legume seeds with spores of Rhizomium to increase nodule formation
b. inoculating seeds with fungal spores to ensure mycorrhizal formation
c. using plants to remove toxic heavy metals from contaminated soils
d. genetic engineering of plants to increase protein content
e. seeding the ocean with iron to create algal blooms that reduce atmospheric CO2 levels.
5. Negatively Charged Minerals
a. are released from clay paticales by cation exchange
b. are reduced by cation exchanged before they can be absorbed
c. are converted into amino acids before they are transported through the plant
d. are bound when roots release acids into the soils
e. are leached away by the action of rainwater more easily than positively charged minerals.