6.5.2 Nutrient cycles

• Nutrients are passed between the biotic and abiotic components of an ecosystem.


  True
• Stages in the movement of nutrients within an ecosystem

  1️⃣ Uptake

  2️⃣ Consumption

  3️⃣ Decomposition

  4️⃣ Mineralization
• Carbon is essential for the formation of organic compounds like carbohydrates, lipids, and proteins
• What is the primary role of phosphorus in ecosystems?

  Energy transfer
• Magnesium is an essential component of chlorophyll
• Which enzyme is crucial in the nitrogen fixation process?

  Nitrogenase
• Match the stage of the nitrogen cycle with the correct bacteria:

  Nitrogen Fixation ↔️ Rhizobium

  Nitrification ↔️ Nitrobacter

  Denitrification ↔️ Denitrifying bacteria
• Which bacterium reduces nitrate (NO₃⁻) into atmospheric nitrogen gas (N₂) during denitrification?

  Denitrifying bacteria
• In nitrogen fixation, atmospheric nitrogen (N₂) is converted into ammonia
• Which stage of the nitrogen cycle reduces nitrate (NO₃⁻) back into atmospheric nitrogen gas (N₂)?

  Denitrification
• What is the enzyme crucial in nitrogen fixation that converts atmospheric nitrogen into ammonia?

  Nitrogenase
• Denitrification releases carbon dioxide into the atmosphere.

  False
• In photosynthesis, plants use sunlight to convert CO₂ and water into glucose
• The carbon cycle ensures carbon is continuously recycled and supports plant growth while regulating atmospheric CO₂ levels.


  True
• In nutrient cycles, producers absorb nutrients from the environment
• Nutrient cycles are crucial for maintaining the balance and productivity of ecosystems.


  True
• Nitrogen is required for the synthesis of amino acids, nucleic acids, and chlorophyll
• Iron is required for the production of hemoglobin and certain enzymes.


  True
• Arrange the stages of the nitrogen cycle based on the chemical reactions that occur:

  1️⃣ Nitrogen Fixation

  2️⃣ Ammonification

  3️⃣ Nitrification

  4️⃣ Denitrification
• Respiration releases carbon dioxide and water as byproducts.


  True
• Nutrient cycles refer to the continuous movement and recycling of nutrients within an ecosystem
• In the uptake stage, nutrients are absorbed by producers
• Nutrient cycling is essential for maintaining the balance and productivity of ecosystems.


  True
• Nitrogen is required for the synthesis of DNA and chlorophyll.


  True
• Match the nutrient with its description:

  Carbon ↔️ Forms organic compounds

  Nitrogen ↔️ Synthesizes amino acids

  Phosphorus ↔️ Energy transfer
• In nitrogen fixation, atmospheric nitrogen gas is converted into ammonia
• Stages of the nitrogen cycle

  1️⃣ Nitrogen Fixation

  2️⃣ Ammonification

  3️⃣ Nitrification

  4️⃣ Denitrification
• The nitrogen cycle ensures nitrogen is continually available for plant uptake
• Denitrification occurs under anaerobic conditions.

  True
• Nitrification involves the conversion of ammonia (NH₃) into nitrite (NO₂⁻) and then nitrate (NO₃⁻).

  True
• The nitrogen cycle ensures that nitrogen is continually available for plant uptake
• Arrange the stages of the nitrogen cycle in the correct order:

  1️⃣ Nitrogen Fixation

  2️⃣ Ammonification

  3️⃣ Nitrification

  4️⃣ Denitrification
• Match the stage of the carbon cycle with its key chemical reaction:

  Photosynthesis ↔️ 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

  Respiration ↔️ C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

  Decomposition ↔️ Decomposition of organic matter

  Combustion ↔️ CₙHₘ + O₂ → CO₂ + H₂O
• Which process releases CO₂ during the carbon cycle when organisms break down glucose for energy?

  Respiration
• What are the two types of components involved in nutrient cycles?

  Biotic and abiotic
• Match the stage of a nutrient cycle with its description:

  Uptake ↔️ Nutrients are absorbed by producers

  Consumption ↔️ Nutrients are transferred to consumers

  Decomposition ↔️ Nutrients are released by decomposers

  Mineralization ↔️ Organic nutrients become inorganic
• Which major nutrient is essential for the formation of organic compounds like carbohydrates, lipids, and proteins?

  Carbon
• Which major nutrient is important for energy transfer (ATP) and cell membranes?

  Phosphorus
• Which enzyme is essential for nitrogen fixation and is produced by bacteria such as Rhizobium?

  Nitrogenase
• In photosynthesis, plants convert CO₂ and water into glucose and oxygen