Question

Which of the following is rod shaped prokaryote free living in soil, but as symbiont, can fix atmospheric nitrogen?
A) Alnus
B) Rhizobium
C) Frankia
D) Both A & B

Answer 1

Answer:

rhizobium is the rod shaped prokaryote free living in soil

Explanation:

Answer 2

Answer:

Both Rhizobium and Frankia are rod-shaped prokaryotes that are free-living in the soil and help in nitrogen fixation.

Explanation:

Such organisms that lack a nucleus and other organelles are called prokaryotes. Most of them are small, single-celled organisms, with a simple structure. Prokaryotes are divided into two groups: bacteria and archaea.

Rhizobium is a nitrogen-fixing soil bacteria that live in a symbiotic relationship with the nodules of roots of leguminous plants. Frankia is also a nitrogen-fixing bacteria but they live in the nodules of the roots of actinorhizal plants.