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Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to
- a)Lack of iron nutrient supplies
- b)Presence of kelp forests (macroalgae) in such areas
- c)Absence of a Photic Zone
- d)Warm water temperature
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Oceans distant from deserts or with limited accessibility to dust-car...
Option (a): A recently discovered to play a significant role in oceanic primary production is the micronutrient iron.
• This is used as a cofactor in enzymes involved in processes such as nitrate reduction and nitrogen fixation.
• A major source of iron to the oceans is dust from the Earth’s deserts, picked up and delivered by the wind as aeolian dust.
• In regions of the ocean that are distant from deserts or that are not reached by dust-carrying winds (for example, the Southern and North Pacific oceans), the lack of iron can severely limit the amount of primary production that can occur.
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Oceans distant from deserts or with limited accessibility to dust-car...
Understanding Primary Productivity in Oceans
Primary productivity in marine ecosystems is largely influenced by nutrient availability, particularly essential micronutrients like iron. Oceans that are distant from deserts or have limited access to dust-carrying winds often experience low primary productivity due to specific reasons.
Lack of Iron Nutrient Supplies
- Iron is a crucial micronutrient needed for the growth of phytoplankton, which are the primary producers in the ocean.
- In many oceanic regions, particularly those far from land, there is a natural scarcity of iron. This limits the growth of phytoplankton.
- Although other nutrients like nitrogen and phosphorus are often present, the absence of iron restricts the ability of phytoplankton to utilize them effectively.
Role of Dust-Carrying Winds
- Desert regions contribute iron-rich dust to the atmosphere, which can be transported over long distances by wind to ocean surfaces.
- When this dust settles in the ocean, it provides the necessary iron for phytoplankton growth, thus enhancing primary productivity.
Other Factors Explained
- Presence of Kelp Forests: While kelp forests can be rich in primary productivity, they do not negate the essential role of iron in open ocean areas.
- Absence of a Photic Zone: The photic zone is crucial for photosynthesis; however, the question pertains to nutrient supply rather than light availability.
- Warm Water Temperature: Warmer waters can affect productivity but do not directly correlate with the lack of iron.
Conclusion
In summary, the correct answer is option 'A' because the limited primary productivity in oceans distant from deserts is primarily due to the lack of iron nutrient supplies necessary for phytoplankton growth. Without adequate iron, even areas with sufficient light and other nutrients will struggle to support high levels of primary productivity.
Primary productivity in marine ecosystems is largely influenced by nutrient availability, particularly essential micronutrients like iron. Oceans that are distant from deserts or have limited access to dust-carrying winds often experience low primary productivity due to specific reasons.
Lack of Iron Nutrient Supplies
- Iron is a crucial micronutrient needed for the growth of phytoplankton, which are the primary producers in the ocean.
- In many oceanic regions, particularly those far from land, there is a natural scarcity of iron. This limits the growth of phytoplankton.
- Although other nutrients like nitrogen and phosphorus are often present, the absence of iron restricts the ability of phytoplankton to utilize them effectively.
Role of Dust-Carrying Winds
- Desert regions contribute iron-rich dust to the atmosphere, which can be transported over long distances by wind to ocean surfaces.
- When this dust settles in the ocean, it provides the necessary iron for phytoplankton growth, thus enhancing primary productivity.
Other Factors Explained
- Presence of Kelp Forests: While kelp forests can be rich in primary productivity, they do not negate the essential role of iron in open ocean areas.
- Absence of a Photic Zone: The photic zone is crucial for photosynthesis; however, the question pertains to nutrient supply rather than light availability.
- Warm Water Temperature: Warmer waters can affect productivity but do not directly correlate with the lack of iron.
Conclusion
In summary, the correct answer is option 'A' because the limited primary productivity in oceans distant from deserts is primarily due to the lack of iron nutrient supplies necessary for phytoplankton growth. Without adequate iron, even areas with sufficient light and other nutrients will struggle to support high levels of primary productivity.
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Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer?.
Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to a) Lack of iron nutrient suppliesb) Presence of kelp forests (macroalgae) in such areasc) Absence of a Photic Zoned) Warm water temperatureCorrect answer is option 'A'. Can you explain this answer?.
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