Nitrogen Cycle and Plant Nutrition

The video explains the importance of nitrogen in gardening, focusing on its role in enzyme production and plant health. It details how plants cannot directly use atmospheric nitrogen and must rely on nitrates from the soil, which are made available through bacterial processes like nitrogen fixation and nitrification. The video also touches on denitrification and special plants with root nodules that can access nitrogen differently. The conclusion invites viewers to join the i Cultivate community.

Why is nitrogen crucial for plant health?

• It is a major component of chlorophyll.

• It is essential for enzyme production.

• It is a primary source of energy.

• It helps in the absorption of sunlight.

How do plants primarily obtain nitrogen?

• In the form of nitrates from the soil.

• Via photosynthesis.

• Directly from the atmosphere.

• Through water absorption.

What is the main challenge for plants in accessing atmospheric nitrogen?

• It is toxic to plants.

• It is too far from the roots.

• It is not in a usable form.

• It is too dense.

What is the first step in making atmospheric nitrogen available to plants?

• Ammonification

• Nitrogen fixation

• Denitrification

• Photosynthesis

What role do nitrifying bacteria play in the nitrogen cycle?

• They convert nitrates back to nitrogen gas.

• They decompose organic matter.

• They fix nitrogen from the atmosphere.

• They convert ammonia and nitrites into nitrates.

What happens to nitrogen when plants are consumed by animals?

• It is absorbed in the form of proteins.

• It is released back into the atmosphere.

• It is converted into carbon dioxide.

• It is stored in the animal's bones.

What is the significance of bacteria in the nitrogen cycle?

• They protect plants from pests.

• They provide energy to plants.

• They decompose plant matter.

• They convert nitrogen into a usable form for plants.

What is the function of denitrifying bacteria?

• They help in plant growth.

• They convert ammonia into nitrites.

• They fix nitrogen from the atmosphere.

• They convert nitrates into nitrogen gas.

Which plants can access nitrates directly from root nodules?

• All flowering plants

• Leguminous plants

• Cacti

• Coniferous trees

Why can some plants grow in nitrate-deficient soils?

• They do not require nitrogen.

• They have a special photosynthesis process.

• They have root nodules with bacteria.

• They absorb nitrogen directly from the air.