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Test: Marine Organisms - UPSC MCQ


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10 Questions MCQ Test - Test: Marine Organisms

Test: Marine Organisms for UPSC 2024 is part of UPSC preparation. The Test: Marine Organisms questions and answers have been prepared according to the UPSC exam syllabus.The Test: Marine Organisms MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Marine Organisms below.
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Test: Marine Organisms - Question 1
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What is the primary role of phytoplankton in aquatic ecosystems?

Detailed Solution for Test: Marine Organisms - Question 1
Phytoplankton primarily serve as the foundation of the aquatic food web. They are microscopic plant organisms that undergo photosynthesis, converting sunlight into chemical energy. This energy is then transferred through the food chain, as phytoplankton are consumed by small organisms like zooplankton, which are in turn eaten by larger organisms, creating a complex web of life in aquatic ecosystems.
Test: Marine Organisms - Question 2
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Which environmental factor influences the distribution of marine phytoplankton?

Detailed Solution for Test: Marine Organisms - Question 2
The distribution of marine phytoplankton is influenced by various factors, and one of them is solar UV-B radiation. In tropical and subtropical regions, high levels of exposure to solar UV-B radiation can affect the distribution of phytoplankton. This radiation is an important consideration for their distribution, especially in areas with high light intensity.
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Test: Marine Organisms - Question 3
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What is the primary function of zooplankton in aquatic ecosystems?

Detailed Solution for Test: Marine Organisms - Question 3
Zooplankton's primary function in aquatic ecosystems is to transfer organic matter from primary producers (like phytoplankton) to secondary consumers, such as fishes. They play a crucial role in the food chain by consuming phytoplankton and being a food source for higher-level consumers, thus facilitating the flow of energy through the ecosystem.
Test: Marine Organisms - Question 4
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What is the primary function of seagrass beds in coastal waters?
Detailed Solution for Test: Marine Organisms - Question 4
Seagrass beds in coastal waters primarily function to reduce wave and current energy. They act as natural buffers, helping to dissipate the energy of waves and currents, which in turn protects shorelines from erosion. Additionally, they provide important habitat for marine invertebrates and fishes.
Test: Marine Organisms - Question 5
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What is the primary classification of seaweeds based on?
Detailed Solution for Test: Marine Organisms - Question 5
Seaweeds are primarily classified based on the color of their pigmentation. They are broadly categorized into different classes, including blue-green, green, brown, and red seaweeds, depending on the dominant pigments in their cells.
Test: Marine Organisms - Question 6
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What is the primary use of seaweeds in various industries?
Detailed Solution for Test: Marine Organisms - Question 6
Seaweeds are commonly used in various industries to extract valuable substances like agar-agar and alginates. These substances have commercial value and are used in the food, pharmaceutical, and cosmetic industries, among others.
Test: Marine Organisms - Question 7
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What is the primary threat to seagrass beds in coastal ecosystems?
Detailed Solution for Test: Marine Organisms - Question 7
The primary threat to seagrass beds in coastal ecosystems is overexploitation for commercial purposes. When seagrass beds are excessively harvested for various commercial uses, it can lead to their decline and disruption of the ecosystem they support.
Test: Marine Organisms - Question 8
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Which organisms are considered part of the zooplankton community?
Detailed Solution for Test: Marine Organisms - Question 8
Tiny flagellates are considered part of the zooplankton community. Zooplankton includes various small, drifting organisms, and flagellates are one of the components of this community.
Test: Marine Organisms - Question 9
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What is the role of phytoplankton in the carbon cycle and its impact on climate change?
Detailed Solution for Test: Marine Organisms - Question 9
Phytoplankton play a crucial role in the carbon cycle by transferring carbon dioxide from the atmosphere to the ocean through photosynthesis. This process helps reduce atmospheric carbon dioxide levels, which can have an impact on mitigating climate change by reducing greenhouse gas concentrations.
Test: Marine Organisms - Question 10
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What is the primary source of oxygen production in aquatic ecosystems?
Detailed Solution for Test: Marine Organisms - Question 10
The primary source of oxygen production in aquatic ecosystems is phytoplankton. These microscopic plant organisms undergo photosynthesis, releasing oxygen as a byproduct, which is essential for the survival of many aquatic organisms and the overall health of the ecosystem.
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