Current Affairs
QUESTION 241Assertion (A): The AmazonFACE experiment uses control groups to compare the effects of elevated atmospheric CO2 on tropical forests.
Reason (R): Only selected experimental rings are exposed to elevated CO2, while the remaining rings are maintained under ambient CO2 conditions and serve as controls.
अभिकथन (A): AmazonFACE प्रयोग में उष्णकटिबंधीय वनों पर बढ़ी हुई वायुमंडलीय CO2 के प्रभावों की तुलना करने के लिए नियंत्रण समूहों (Control Groups) का उपयोग किया जाता है।
कारण (R): केवल चयनित प्रायोगिक रिंग्स को बढ़ी हुई CO2 के संपर्क में रखा जाता है, जबकि शेष रिंग्स को सामान्य वायुमंडलीय CO2 परिस्थितियों में रखा जाता है और वे नियंत्रण (Control) के रूप में कार्य करती हैं।A. Both A and R are correct, and R is the correct explanation of A.B. Both A and R are correct, but R is not the correct explanation of A.C. A is correct, but R is incorrect.D. A is incorrect, but R is correct.
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Answer: A
The correct answer is that both Assertion (A) and Reason (R) are correct, and R correctly explains A. AmazonFACE, or Amazon Free-Air CO2 Enrichment, is a large-scale scientific experiment designed to investigate how mature Amazonian tropical forests respond to higher atmospheric carbon dioxide concentrations. The experimental design includes multiple forest plots or rings. Some rings receive additional CO2 to create elevated-CO2 conditions, while other rings remain under ambient atmospheric CO2 conditions and function as controls. Researchers can compare the treated and control rings to determine whether observed changes in tree growth, carbon cycling, nutrient dynamics and other ecosystem processes are attributable to elevated CO2. Thus, the presence of untreated control rings provides the basis for comparison, which directly explains why AmazonFACE uses control groups. Therefore, Option A is correct.
Which of the following scientific initiatives is directly associated with experimental research on the effects of climate change and elevated atmospheric CO2 on tropical forests?
निम्नलिखित में से कौन-सी वैज्ञानिक पहल उष्णकटिबंधीय वनों पर जलवायु परिवर्तन और बढ़ी हुई वायुमंडलीय CO2 के प्रभावों से संबंधित प्रायोगिक अनुसंधान से सीधे जुड़ी है?A. Amazon Free-Air CO2 Enrichment (AmazonFACE)B. Model Youth Gram Sabha (MYGS)C. Coal Land Acquisition, Management and Payment (CLAMP)D. Transit-Oriented Development (TOD)
Show answer & explanation
Answer: A
The correct answer is Amazon Free-Air CO2 Enrichment (AmazonFACE). AmazonFACE is a large-scale scientific experiment designed to investigate how mature Amazonian tropical forests respond to increased atmospheric carbon dioxide concentrations. In the experiment, selected forest plots or rings are exposed to elevated CO2, while other rings remain under ambient CO2 conditions and serve as controls. Scientists compare these plots to study changes in tree growth, photosynthesis, carbon storage, nutrient cycling and other ecosystem processes. The experiment is particularly important for climate science because tropical forests absorb and store enormous quantities of carbon, and their future response to rising atmospheric CO2 could influence the global carbon cycle and climate. MYGS is associated with Panchayati Raj and simulated Gram Sabha participation, CLAMP deals with land-related processes in the coal sector, and TOD is an urban-planning approach focused on public transport and compact development. Therefore, Option A is correct.
Which of the following best describes the broader function of the Agricultural and Processed Food Products Export Development Authority (APEDA)?
निम्नलिखित में से कौन-सा कृषि और प्रसंस्कृत खाद्य उत्पाद निर्यात विकास प्राधिकरण (APEDA) के व्यापक कार्य का सबसे सही वर्णन करता है?A. Facilitating and promoting agricultural and processed food exportsB. Regulating wildlife sanctuariesC. Conducting local electionsD. Managing land acquisition in the coal sector
Show answer & explanation
Answer: A
The correct answer is facilitating and promoting agricultural and processed food exports. APEDA stands for Agricultural and Processed Food Products Export Development Authority. It is a statutory body under the Ministry of Commerce and Industry, Government of India, and functions under the APEDA Act, 1985. Its major role is to promote the development and export of scheduled agricultural and processed food products. Its activities include export promotion, registration of exporters, improvement of packaging and marketing, development of standards, inspection and quality-related measures, and support for export-oriented infrastructure. APEDA is also involved in promoting Indian agricultural products in international markets. It is not responsible for regulating wildlife sanctuaries, conducting local elections or managing coal-sector land. Therefore, Option A is correct.
Which of the following agricultural products is associated with a Geographical Indication (GI)-based regional identity?
निम्नलिखित में से कौन-सा कृषि उत्पाद भौगोलिक संकेतक (GI) पर आधारित क्षेत्रीय पहचान से संबंधित है?A. Indi LimeB. Atlas MothC. Amazon Free-Air CO2 Enrichment (AmazonFACE)D. Hemiphyllodactylus venkatadri
Show answer & explanation
Answer: A
The correct answer is Indi Lime. Indi Lime is an agricultural product associated with the Indi region of Vijayapura district in Karnataka and has received Geographical Indication (GI) recognition. A GI tag identifies a product as originating from a particular geographical area when its quality, reputation or other distinctive characteristics are essentially attributable to that place of origin. Such recognition helps protect the regional identity of the product and can enhance its market value and visibility. The Atlas Moth is a large moth belonging to the family Saturniidae and is related to biodiversity. AmazonFACE is a scientific experiment that studies the response of Amazonian tropical forests to elevated atmospheric CO2. Hemiphyllodactylus venkatadri is a slender gecko associated with the Tirumala Hills of Andhra Pradesh. Therefore, Option A is correct.
Which of the following urban development approaches directly promotes pedestrian- and cyclist-friendly infrastructure while reducing dependence on private motor vehicles?
निम्नलिखित में से कौन-सा शहरी विकास दृष्टिकोण पैदल यात्रियों और साइकिल चालकों के अनुकूल बुनियादी ढाँचे को सीधे बढ़ावा देता है तथा निजी मोटर वाहनों पर निर्भरता कम करने का प्रयास करता है?A. Transit-Oriented Development (TOD)B. East Asia Summit (EAS)C. Coal Land Acquisition, Management and Payment (CLAMP)D. Agricultural and Processed Food Products Export Development Authority (APEDA)
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Answer: A
The correct answer is Transit-Oriented Development (TOD). TOD is an urban planning approach that integrates land-use planning with efficient public transport systems. It promotes compact and mixed-use development around transit stations and encourages people to use public transport, walk and cycle instead of relying heavily on private motor vehicles. Pedestrian-friendly footpaths, safe cycling infrastructure, improved connectivity and easy access to public transport are important features of TOD. Such planning can help reduce traffic congestion, travel distances, fuel consumption and vehicular emissions while improving urban accessibility and mobility. The East Asia Summit (EAS) is a leaders-led regional forum concerned with strategic, political and economic cooperation. CLAMP is associated with land acquisition and management in the coal sector, while APEDA promotes the development and export of agricultural and processed food products. Therefore, Option A is correct.
Which of the following pairs is correctly matched?
निम्नलिखित में से कौन-सा युग्म सही सुमेलित है?A. CLAMP — Coal land acquisition and managementB. MYGS — Wildlife rehabilitationC. TOD — Tropical forest experimentD. AmazonFACE — Rural digital services
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Answer: A
The correct answer is CLAMP — Coal land acquisition and management. CLAMP is associated with the coal sector and is designed to streamline land-related processes involving coal Public Sector Undertakings (PSUs). It deals with areas such as land acquisition, land management, compensation, Rehabilitation and Resettlement (R&R), and related payment processes. MYGS, or Model Youth Gram Sabha, is not related to wildlife rehabilitation; it is an educational initiative associated with Panchayati Raj, Gram Sabha functioning and grassroots democratic participation among students. TOD, or Transit-Oriented Development, is not a tropical forest experiment; it is an urban-planning approach that promotes public transport, mixed land use, walking and cycling while reducing dependence on private vehicles. AmazonFACE is not related to rural digital services; it is a scientific experiment that studies how Amazonian tropical forests respond to elevated atmospheric CO2. Therefore, only the first pair is correctly matched, making Option A the correct answer.
Consider the following statements regarding the East Asia Summit (EAS):
1. It is a leaders-led forum for dialogue and cooperation on strategic, political and economic issues.
2. India is a participating member of the East Asia Summit.
3. ASEAN plays a central role in the East Asia Summit process.
4. The East Asia Summit was established in 2005.
Which of the statements given above are correct?
पूर्वी एशिया शिखर सम्मेलन (East Asia Summit–EAS) के संबंध में निम्नलिखित कथनों पर विचार कीजिए:
1. यह रणनीतिक, राजनीतिक और आर्थिक मुद्दों पर संवाद एवं सहयोग के लिए नेताओं द्वारा संचालित एक मंच है।
2. भारत पूर्वी एशिया शिखर सम्मेलन का एक सहभागी सदस्य है।
3. पूर्वी एशिया शिखर सम्मेलन की प्रक्रिया में ASEAN केंद्रीय भूमिका निभाता है।
4. पूर्वी एशिया शिखर सम्मेलन की स्थापना वर्ष 2005 में हुई थी।
उपर्युक्त कथनों में से कौन-से सही हैं?A. 1 and 2 onlyB. 1, 2 and 3 onlyC. 2, 3 and 4 onlyD. 1, 2, 3 and 4
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Answer: D
The correct answer is 1, 2, 3 and 4. All four statements are correct. Statement 1 is correct because the East Asia Summit (EAS) is a leaders-led forum for dialogue and cooperation on major strategic, political and economic issues of common interest in the Indo-Pacific region. Statement 2 is correct because India has been a participant in the EAS since its inception. Statement 3 is correct because ASEAN plays a central role in the EAS framework, and the summit is generally held in conjunction with the annual ASEAN leaders' meetings. ASEAN centrality is an important feature of the regional architecture in which the EAS operates. Statement 4 is also correct. The first East Asia Summit was held in Kuala Lumpur, Malaysia, on 14 December 2005. The original EAS participants comprised the ten ASEAN member states along with Australia, China, India, Japan, New Zealand and the Republic of Korea. The United States and Russia subsequently joined the EAS in 2011. Therefore, all four statements are correct and Option D is the correct answer.
Which of the following best distinguishes Transit-Oriented Development (TOD) from Samriddh Gram Phygital Services?
निम्नलिखित में से कौन-सा ट्रांजिट-ओरिएंटेड डेवलपमेंट (TOD) और समृद्ध ग्राम फिजिटल सेवाओं के बीच अंतर को सबसे अच्छी तरह दर्शाता है?A. TOD focuses on transport-oriented urban development, while Samriddh Gram focuses on integrated rural phygital services.B. Both are wildlife conservation programmes.C. Both are exclusively agricultural schemes.D. Both are carbon-enrichment experiments.
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Answer: A
The correct answer is that TOD focuses on transport-oriented urban development, while Samriddh Gram focuses on integrated rural phygital services. Transit-Oriented Development (TOD) is an urban-planning approach that integrates land-use planning with public transport. It encourages compact and mixed-use development around transit stations and promotes walking, cycling and public transport while reducing dependence on private vehicles. Samriddh Gram Phygital Services, on the other hand, focuses on improving rural service delivery by integrating physical infrastructure with digital technologies. The term 'phygital' combines physical and digital modes of service delivery and may include services such as digital connectivity, teleconsultation, smart classrooms, digital banking and access to digital commerce. Thus, TOD primarily addresses sustainable urban mobility and spatial planning, whereas Samriddh Gram focuses on technology-enabled and accessible rural services. Therefore, Option A is correct.
Which of the following initiatives is most directly associated with promoting local democratic participation and awareness of grassroots governance among school students?
निम्नलिखित में से कौन-सी पहल स्कूली विद्यार्थियों में स्थानीय लोकतांत्रिक भागीदारी और जमीनी शासन के प्रति जागरूकता को बढ़ावा देने से सबसे सीधे संबंधित है?A. Model Youth Gram Sabha (MYGS)B. Coal Land Acquisition, Management and Payment (CLAMP)C. Amazon Free-Air CO2 Enrichment (AmazonFACE)D. Transit-Oriented Development (TOD)
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Answer: A
The correct answer is Model Youth Gram Sabha (MYGS). MYGS is an educational initiative designed to familiarise school students with grassroots democracy, Panchayati Raj institutions and the functioning of Gram Sabhas. Through simulated Gram Sabha proceedings, students can take on different roles, discuss local issues, identify development priorities, deliberate on village-level needs and understand participatory decision-making. Such activities provide practical exposure to democratic processes at the local level and help develop awareness about citizens' participation in governance. CLAMP is associated with land acquisition, management, compensation and related processes in the coal sector. AmazonFACE is a scientific experiment studying how Amazonian tropical forests respond to elevated atmospheric CO2. TOD is an urban-planning approach that integrates public transport with compact, mixed-use and pedestrian-friendly development. Therefore, Option A is correct.
Consider the following initiatives:
1. CLAMP Portal
2. Samriddh Gram Phygital Services
3. Model Youth Gram Sabha (MYGS)
Which of the above can be considered examples of digital or technology-enabled governance and service delivery?
निम्नलिखित पहलों पर विचार कीजिए:
1. CLAMP पोर्टल
2. समृद्ध ग्राम फिजिटल सेवाएँ
3. मॉडल यूथ ग्राम सभा (MYGS)
उपर्युक्त में से किन्हें डिजिटल या प्रौद्योगिकी-सक्षम शासन एवं सेवा वितरण के उदाहरण के रूप में माना जा सकता है?A. 1 onlyB. 1 and 2 onlyC. 2 and 3 onlyD. 1, 2 and 3
Show answer & explanation
Answer: D
The correct answer is 1, 2 and 3. All three initiatives involve the use of digital or technology-enabled mechanisms in governance, public administration or service delivery, although their objectives differ. The CLAMP Portal is associated with the coal sector and uses a digital platform to streamline processes related to land acquisition, land management, compensation, Rehabilitation and Resettlement (R&R), and related payments, thereby improving efficiency and transparency. Samriddh Gram Phygital Services combine physical infrastructure with digital technologies to improve the delivery of services in rural areas. The phygital model can facilitate access to services such as digital banking, teleconsultation, smart classrooms, digital commerce and other technology-enabled facilities. Model Youth Gram Sabha (MYGS) is primarily an educational and participatory-governance initiative that familiarises students with Gram Sabha functioning, Panchayati Raj and grassroots democratic decision-making; technology and digital tools can support its simulation, learning and implementation processes. Therefore, in the given context, all three can be associated with technology-enabled governance or service delivery, making Option D correct.
Consider the following:
1. Hastinapur Wildlife Sanctuary
2. Atlas Moth
3. Hemiphyllodactylus venkatadri
4. AmazonFACE
Which of the above are directly associated with biodiversity, ecology or ecological research?
निम्नलिखित पर विचार कीजिए:
1. हस्तिनापुर वन्यजीव अभयारण्य
2. एटलस मॉथ
3. Hemiphyllodactylus venkatadri
4. AmazonFACE
उपर्युक्त में से कौन-से जैव विविधता, पारिस्थितिकी अथवा पारिस्थितिक अनुसंधान से सीधे संबंधित हैं?A. 1 and 2 onlyB. 1, 2 and 3 onlyC. 2, 3 and 4 onlyD. 1, 2, 3 and 4
Show answer & explanation
Answer: D
The correct answer is 1, 2, 3 and 4. All four are associated with biodiversity, ecology or ecological research. Hastinapur Wildlife Sanctuary is a protected area in Uttar Pradesh and is important for the conservation of wildlife, natural habitats and biodiversity. The Atlas Moth (Attacus atlas) is one of the world's largest moths and belongs to the family Saturniidae; as a biological species, it is relevant to biodiversity and zoological studies. Hemiphyllodactylus venkatadri is a slender gecko species associated with the Tirumala Hills of Andhra Pradesh, and its study is important for taxonomy, reptile diversity and conservation. AmazonFACE, or Amazon Free-Air CO2 Enrichment, is a scientific experiment that investigates how Amazonian tropical forests respond to elevated atmospheric CO2. It is directly relevant to forest ecology, ecosystem processes, carbon cycling and climate-change research. Therefore, all four are associated with biodiversity, ecology or ecological research, making Option D correct.
Consider the following pairs:
1. Hastinapur Wildlife Sanctuary — Uttar Pradesh
2. Indi Lime — Karnataka
3. Hemiphyllodactylus venkatadri — Andhra Pradesh
4. AmazonFACE — Brazil
How many of the above pairs are correctly matched?
निम्नलिखित युग्मों पर विचार कीजिए:
1. हस्तिनापुर वन्यजीव अभयारण्य — उत्तर प्रदेश
2. इंडी लाइम — कर्नाटक
3. Hemiphyllodactylus venkatadri — आंध्र प्रदेश
4. AmazonFACE — ब्राज़ील
उपर्युक्त युग्मों में से कितने सही सुमेलित हैं?A. Only oneB. Only twoC. Only threeD. All four
Show answer & explanation
Answer: D
The correct answer is All four. Each of the four pairs is correctly matched. Pair 1 is correct because Hastinapur Wildlife Sanctuary is located in Uttar Pradesh. It is an important protected area associated with the conservation of wildlife and natural habitats in the upper Ganga region. Pair 2 is correct because Indi Lime is associated with the Indi region of Vijayapura district in Karnataka and is known for its Geographical Indication (GI) recognition. Pair 3 is correct because Hemiphyllodactylus venkatadri is a slender gecko species associated with the Tirumala Hills of Andhra Pradesh. Its discovery and study are significant from the perspective of reptile biodiversity and taxonomy. Pair 4 is correct because AmazonFACE, or Amazon Free-Air CO2 Enrichment, is a scientific experiment located in the Brazilian Amazon. It investigates how mature tropical forests respond to elevated atmospheric CO2 concentrations and is important for understanding forest ecology and climate change. Therefore, all four pairs are correctly matched and Option D is correct.
Which of the following scientific experiments uses Free-Air CO2 Enrichment (FACE) technology, experimental tower rings and elevated atmospheric CO2 to study the response of an old-growth Amazonian tropical forest?
निम्नलिखित में से कौन-सा वैज्ञानिक प्रयोग Free-Air CO2 Enrichment (FACE) तकनीक, प्रायोगिक टावर रिंग्स और बढ़ी हुई वायुमंडलीय CO2 का उपयोग करके पुराने एवं परिपक्व अमेज़न उष्णकटिबंधीय वन की प्रतिक्रिया का अध्ययन करता है?A. Amazon Free-Air CO2 Enrichment (AmazonFACE)B. Mangrove Initiative for Shoreline Habitats and Tangible Incomes (MISHTI)C. Samriddh Gram Phygital ServicesD. Coal Land Acquisition, Management and Payment (CLAMP)
Show answer & explanation
Answer: A
The correct answer is Amazon Free-Air CO2 Enrichment (AmazonFACE). AmazonFACE is a major scientific experiment in the Brazilian Amazon designed to examine how an old-growth tropical forest responds to increased atmospheric carbon dioxide. It uses Free-Air CO2 Enrichment (FACE) technology, in which CO2 can be released within large experimental forest rings without enclosing the vegetation in chambers. The experimental design uses multiple tower-ring plots, with selected rings exposed to elevated CO2 and others maintained under ambient conditions as controls. Researchers can thereby study changes in photosynthesis, tree growth, carbon storage, nutrient cycling and other ecosystem processes. The experiment is important for predicting whether mature Amazon forests will continue to absorb substantial amounts of atmospheric carbon as CO2 concentrations rise. MISHTI is associated with mangrove restoration and conservation in India, Samriddh Gram focuses on integrated physical and digital rural services, and CLAMP is associated with land acquisition and management in the coal sector. Therefore, Option A is correct.
Which of the following best describes the experimental design used in the Amazon Free-Air CO2 Enrichment (AmazonFACE) project?
निम्नलिखित में से कौन-सा Amazon Free-Air CO2 Enrichment (AmazonFACE) परियोजना में उपयोग किए जाने वाले प्रायोगिक डिजाइन का सर्वोत्तम वर्णन करता है?A. Comparison between elevated-CO2 treatment plots and ambient-CO2 control plotsB. Observation of the forest exclusively through satellite-based remote sensingC. Experiments conducted exclusively on laboratory-grown seedlingsD. Exposure of all experimental plots to elevated CO2 without any comparative control
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Answer: A
The correct answer is comparison between elevated-CO2 treatment plots and ambient-CO2 control plots. AmazonFACE is a large-scale field experiment designed to determine how a mature Amazonian tropical forest responds to increased atmospheric carbon dioxide. Its experimental design consists of six forest rings. Three rings are exposed to elevated CO2 and function as treatment plots, while the other three remain under ambient atmospheric CO2 conditions and serve as control plots. This treatment-control design enables scientists to compare the two groups and identify changes that can be attributed specifically to elevated CO2. Researchers can examine effects on photosynthesis, tree growth, carbon uptake and storage, water relations, nutrient cycling and other ecosystem processes. AmazonFACE therefore differs fundamentally from studies based solely on satellite observations or laboratory-grown seedlings because it experimentally manipulates CO2 concentrations in an intact, mature tropical forest under natural environmental conditions. The presence of control plots provides the baseline necessary for scientifically meaningful comparison. Therefore, Option A is correct.
Which of the following best describes the experimental design of the Amazon Free-Air CO2 Enrichment (AmazonFACE) project?
निम्नलिखित में से कौन-सा Amazon Free-Air CO2 Enrichment (AmazonFACE) परियोजना के प्रायोगिक डिजाइन का सर्वोत्तम वर्णन करता है?A. Comparison between elevated-CO2 treatment plots and ambient-CO2 control plotsB. Monitoring of the Amazon forest exclusively through satellite observationsC. Experiments conducted only on laboratory-grown seedlingsD. Exposure of all experimental plots to elevated CO2 without any comparative control
Show answer & explanation
Answer: A
The correct answer is comparison between elevated-CO2 treatment plots and ambient-CO2 control plots. AmazonFACE is a Free-Air CO2 Enrichment experiment designed to investigate how a mature Amazonian tropical forest responds to higher atmospheric carbon dioxide concentrations. Its experimental design uses multiple forest plots or rings. Some rings are exposed to elevated CO2 concentrations and function as treatment plots, while other rings remain under ambient atmospheric CO2 conditions and serve as controls. Researchers compare the treated and control plots to identify changes attributable to elevated CO2, including effects on photosynthesis, tree growth, carbon storage, nutrient cycling and other ecosystem processes. The experiment is conducted in an actual forest environment rather than being restricted to satellite observations or laboratory-grown seedlings. The presence of control plots is essential because it provides a baseline against which the effects of elevated CO2 can be measured. Therefore, Option A is correct.
Assertion (A): AmazonFACE can improve scientific understanding of how mature tropical forests may respond to climate change.
Reason (R): AmazonFACE exposes mature Amazonian forest plots to elevated atmospheric CO2 concentrations and monitors their physiological and ecosystem responses.
अभिकथन (A): AmazonFACE इस वैज्ञानिक समझ को बेहतर बनाने में सहायता कर सकता है कि परिपक्व उष्णकटिबंधीय वन जलवायु परिवर्तन के प्रति किस प्रकार प्रतिक्रिया कर सकते हैं।
कारण (R): AmazonFACE परिपक्व अमेज़न वन के प्लॉटों को बढ़ी हुई वायुमंडलीय CO2 सांद्रता के संपर्क में रखता है और उनकी शारीरिक तथा पारिस्थितिकी तंत्र संबंधी प्रतिक्रियाओं की निगरानी करता है।A. Both A and R are correct, and R is the correct explanation of A.B. Both A and R are correct, but R is not the correct explanation of A.C. A is correct, but R is incorrect.D. A is incorrect, but R is correct.
Show answer & explanation
Answer: A
The correct answer is that both Assertion (A) and Reason (R) are correct, and R correctly explains A. AmazonFACE, or Amazon Free-Air CO2 Enrichment, is a large-scale field experiment designed to investigate how mature Amazonian tropical forests respond to elevated atmospheric carbon dioxide concentrations. Instead of restricting the study to seedlings grown in laboratories or enclosed chambers, the FACE approach allows researchers to expose sections of an intact mature forest to higher CO2 concentrations under natural environmental conditions. Scientists can then monitor responses involving photosynthesis, tree growth, carbon uptake and storage, nutrient cycling, water relations and other ecosystem processes. Comparing elevated-CO2 treatment plots with ambient-CO2 control plots helps researchers determine how rising atmospheric CO2 may influence the functioning and carbon-storage capacity of tropical forests. Since increasing atmospheric CO2 is a major component of anthropogenic climate change, these observations can improve projections of how Amazonian forests and the global carbon cycle may respond to future climatic conditions. Thus, the Reason directly explains the Assertion. Therefore, Option A is correct.
Assertion (A): AmazonFACE can improve scientific understanding of how mature tropical forests may respond to climate change.
Reason (R): AmazonFACE exposes mature Amazonian forest plots to elevated atmospheric CO2 concentrations and monitors their physiological and ecosystem responses.
अभिकथन (A): AmazonFACE इस वैज्ञानिक समझ को बेहतर बनाने में सहायता कर सकता है कि परिपक्व उष्णकटिबंधीय वन जलवायु परिवर्तन के प्रति किस प्रकार प्रतिक्रिया कर सकते हैं।
कारण (R): AmazonFACE परिपक्व अमेज़न वन के प्लॉटों को बढ़ी हुई वायुमंडलीय CO2 सांद्रता के संपर्क में रखता है और उनकी शारीरिक तथा पारिस्थितिकी तंत्र संबंधी प्रतिक्रियाओं की निगरानी करता है।A. Both A and R are correct, and R is the correct explanation of A.B. Both A and R are correct, but R is not the correct explanation of A.C. A is correct, but R is incorrect.D. A is incorrect, but R is correct.
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Answer: A
The correct answer is that both Assertion (A) and Reason (R) are correct, and R correctly explains A. AmazonFACE, or Amazon Free-Air CO2 Enrichment, is a large-scale field experiment designed to investigate how mature Amazonian tropical forests respond to elevated atmospheric carbon dioxide concentrations. Instead of restricting the study to seedlings grown in laboratories or enclosed chambers, the FACE approach allows researchers to expose sections of an intact mature forest to higher CO2 concentrations under natural environmental conditions. Scientists can then monitor responses involving photosynthesis, tree growth, carbon uptake and storage, nutrient cycling, water relations and other ecosystem processes. Comparing elevated-CO2 treatment plots with ambient-CO2 control plots helps researchers determine how rising atmospheric CO2 may influence the functioning and carbon-storage capacity of tropical forests. Since increasing atmospheric CO2 is a major component of anthropogenic climate change, these observations can improve projections of how Amazonian forests and the global carbon cycle may respond to future climatic conditions. Thus, the Reason directly explains the Assertion. Therefore, Option A is correct.
In which of the following countries is the Amazon Free-Air CO2 Enrichment (AmazonFACE) Project located?
निम्नलिखित में से किस देश में Amazon Free-Air CO2 Enrichment (AmazonFACE) परियोजना स्थित है?A. PeruB. BrazilC. ColombiaD. Ecuador
Show answer & explanation
Answer: B
The correct answer is Brazil. The Amazon Free-Air CO2 Enrichment (AmazonFACE) Project is located in the Brazilian Amazon, near Manaus in the state of Amazonas. It is a large-scale field experiment designed to investigate how mature Amazonian tropical forests respond to elevated atmospheric carbon dioxide concentrations. The project uses Free-Air CO2 Enrichment (FACE) technology, which enables researchers to increase CO2 concentrations around trees in experimental forest plots without enclosing the vegetation in chambers. Some experimental rings are exposed to elevated CO2, while others remain under ambient atmospheric conditions and serve as controls. Researchers examine changes in photosynthesis, tree growth, carbon storage, nutrient cycling and other ecosystem processes. The findings are important for understanding whether the Amazon rainforest will continue to act as a major carbon sink as atmospheric CO2 concentrations rise and the global climate changes. Therefore, Option B, Brazil, is correct.
The Amazon Free-Air CO2 Enrichment (AmazonFACE) Project primarily aims to understand how the Amazon rainforest may respond to which of the following?
Amazon Free-Air CO2 Enrichment (AmazonFACE) परियोजना का मुख्य उद्देश्य यह समझना है कि अमेज़न वर्षावन निम्नलिखित में से किसके प्रति किस प्रकार प्रतिक्रिया कर सकता है?A. Future climate change and rising atmospheric CO2 concentrationsB. Only soil erosionC. Only wildlife huntingD. Only river pollution
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Answer: A
The correct answer is future climate change and rising atmospheric CO2 concentrations. AmazonFACE is a large-scale field experiment designed to investigate how mature Amazonian tropical forests respond to elevated atmospheric carbon dioxide, an important component of ongoing and future climate change. Using Free-Air CO2 Enrichment (FACE) technology, researchers expose selected forest plots to higher CO2 concentrations while other plots remain under ambient conditions as controls. Scientists then study responses such as photosynthesis, tree growth, carbon uptake and storage, nutrient cycling, water relations and other ecosystem processes. The results can help scientists assess whether rising CO2 will stimulate forest growth and carbon sequestration or whether limitations such as nutrient availability will restrict this response. Understanding these processes is important because the Amazon rainforest plays a major role in the global carbon cycle and climate system. The project is not designed solely to study soil erosion, wildlife hunting or river pollution. Therefore, Option A is correct.
At approximately what time interval do the sensors used in the AmazonFACE experiment record data on forest and environmental responses?
AmazonFACE प्रयोग में उपयोग किए जाने वाले सेंसर वन एवं पर्यावरणीय प्रतिक्रियाओं से संबंधित डेटा लगभग कितने समय के अंतराल पर रिकॉर्ड करते हैं?A. Every 1 minuteB. Every 10 minutesC. Every 1 hourD. Every 24 hours
Show answer & explanation
Answer: B
The correct answer is every 10 minutes. The Amazon Free-Air CO2 Enrichment (AmazonFACE) experiment uses an extensive monitoring system to collect high-frequency data from the experimental forest plots. Sensors record relevant environmental and forest-response measurements at intervals of approximately 10 minutes. Such frequent measurements allow researchers to track short-term variations and longer-term trends in environmental conditions and ecosystem responses. The monitoring system works alongside the FACE infrastructure, in which selected forest plots are exposed to elevated atmospheric CO2 while other plots remain under ambient CO2 conditions as controls. The resulting data help researchers analyse how a mature Amazonian forest responds to elevated CO2 and associated environmental changes. High-frequency monitoring is particularly useful because variables such as temperature, humidity, CO2 concentration and plant physiological responses can change considerably during the course of a day. Therefore, Option B is correct.
