Which of the following character is similar in cyanobacteria and E.coli ?Nitrogen fixation 80 s ribosome Chlorophyll 'a' Nature of cell wall

The character that is similar in both cyanobacteria and E.coli is Nitrogen fixation. Both these organisms are capable of converting atmospheric nitrogen into a form that can be used by plants. This process is known as nitrogen fixation.

Here's a step-by-step explanation:

1. Cyanobacteria and E.coli are both types of bacteria. Cyanobacteria are photosynthetic bacteria, while E.coli is a type of bacteria that lives in the intestines of humans and animals.

2. Nitrogen fixation is a process by which nitrogen in the atmosphere is converted into a form that can be used by plants. This is an important process because nitrogen is a crucial nutrient for plant growth.

3. Both cyanobacteria and E.coli have the ability to fix nitrogen. In cyanobacteria, this process is carried out by specialized cells called heterocysts. In E.coli, nitrogen fixation occurs under anaerobic conditions.

4. The other options provided - 80s ribosome, Chlorophyll 'a', and nature of cell wall - are not similar in cyanobacteria and E.coli. Cyanobacteria have 70s ribosomes, not 80s. They also contain chlorophyll 'a', which is not found in E.coli. The nature of the cell wall also differs between these two types of bacteria.

Therefore, the correct answer is Nitrogen fixation.