Question

1. Plants that induce the formation of root nodules to harbor nitrogen fixing bacteria need to keep the oxygen concentration of the nodule very...

-low

-high

2. The absorption of a photon by reaction center chlorophyll molecules makes them a very strong...

-Reductant

-Oxidant

-Electron donor

Answer 1

Answer=

plants that induce the formation of root nodules to harbor nitrogen fixing bacteria need to keep the oxygen concentration of the nodule very low

Explaination=plants produce the formation of root nodules by process of nitrogen fixation.

there are 2 types of nitrogen fixing bacteria.aerobic & anaerobic.

Nitrogenase= is an enzyme catalyses the of nitrogen gas into ammonia in case of nitrogen fixing bacteria.

it is very sensitive to Oxygen it is inactivated when exposed to oxygen.

This is not a problem in anaerobic bacteria like clostridium.

In case of aerobic bacteria they have mechanism for protecting nitrogenase enzyme.

e.g.In case azatobactor = they have high rate of respiration & maintains low level of oxygen