Question

Without bacteria in the environment

Answer 1

Answer: e. All of the choices are correct.

Explanation: Bacteria is an important part of the ecosystem. There are some bacterial species which we called (biological nitrogen fixation (BNF). These bacteria fixes atmospheric nitrogen for higher plants. There are some other bacterial species which feed on dead bodies of living material and helps in cleaning the environment. Due to this decomposition process high amount of carbon is liberated in the atmosphere and used by the plants during photosynthesis.

Answer 2

Answer:

e. All of the choices are correct.

Explanation:

Bacteria are present almost everywhere on Earth. Many bacteria like cyanobacteria play an important role in fixing the atmospheric carbon in the form of an organic molecule. These organic molecules then used to gain energy.

Many nitrogen-fixing bacteria like Rhizobium,  Azotobacter, etc plays an important role in providing nitrogen to plants which is important for their growth. Many bacteria decompose organic matter into simpler form and recycle the nutrients present in them.  

So bacteria like Pseudomonas putida decompose waste and clean the environment, therefore, they also help in bioremediation. So the correct answer is e. All of the choices are correct.