The Carbon Cycle

Plants remove carbon from the environment in photosynthesis and return it in respiration.

Nitrogen fixation is the conversion of nitrogen into nitrate, a form that can be used by plants.

Nitrogen-fixing bacteria can be found free in the soil or live in the root nodules of legumes, and they convert nitrogen into nitrate that can be used by plants.

<p>Nitrification is the process by which ammonia is converted to nitrites and then to nitrates by nitrifying bacteria.</p> Signup and view all the answers

<p>Denitrifying bacteria play a crucial role in the nitrogen cycle by converting nitrates to nitrogen gas. They are commonly found in anaerobic conditions, such as swampy soil or deep in the soil where water collects.</p> Signup and view all the answers

<p>Nitrifying bacteria are responsible for converting ammonia to nitrates/nitrites in the nitrogen cycle. This conversion process helps in the cycling of nitrogen for plant and microbial use.</p> Signup and view all the answers

<p>Fungi contribute to the nitrogen cycle by assisting in the conversion of dead plants and animals, as well as their wastes, into ammonia in the soil. This process is essential for the recycling of nitrogen in the ecosystem.</p> Signup and view all the answers

<p>Denitrifying bacteria convert nitrates to nitrogen gas, which helps maintain the balance of nitrogen in the ecosystem by preventing an excess buildup of nitrates in the soil and groundwater. This process also recycles nitrogen back into the atmosphere, completing the nitrogen cycle.</p> Signup and view all the answers

<p>Anaerobic bacteria, such as denitrifying bacteria, play a crucial role in the nitrogen cycle by converting nitrates to nitrogen gas. Their habitat in swampy soil or deep in the soil where water collects allows them to thrive in oxygen-poor environments, where they can carry out denitrification.</p> Signup and view all the answers

<p>Plants absorb nitrates from the soil to make proteins, while animals consume plants and utilize the proteins to form animal protein. This contributes to the cycling of nitrogen in the ecosystem, as nitrogen moves through the food chain and is eventually returned to the soil through decomposition, completing the nitrogen cycle.</p> Signup and view all the answers

<p>Microorganisms, such as fungi and bacteria, return carbon to the environment when they decompose dead plants and animals. This decomposition process releases carbon back into the atmosphere, contributing to the cycling of carbon in the environment.</p> Signup and view all the answers

<p>Nitrogen fixation is the conversion of nitrogen into nitrate, a form that can can be used by plants. This process can occur through volcanic action, lightning, industrial processes, and by some bacteria. Examples of natural nitrogen fixation include volcanic action and lightning, while industrial processes involve human activities like the Haber-Bosch process.</p> Signup and view all the answers

<p>Nitrogen-fixing bacteria can be found free in the soil or live in the root nodules of legumes. The bacteria use the plant as a carbohydrate source of energy, protection, and shelter, while the plant uses the nitrate produced by the bacterium. This mutualistic relationship benefits both the bacteria and the plants, contributing to the nitrogen cycle through nitrogen fixation and plant growth.</p> Signup and view all the answers

<p>Nitrification is the process in which ammonia is converted to nitrites, and then to nitrates by nitrifying bacteria. This conversion process is essential for making nitrogen available in a form that plants can utilize for their growth and development in the nitrogen cycle.</p> Signup and view all the answers