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Subject: Basic Sciences

  • NISAR Satellite will be able to monitor Tectonic Movements: ISRO chief

    Why in the News?

    The ISRO Chief has confirmed that the NISAR Satellite would be able to monitor the Tectonic Movements of Earth with high precision with a centimeter accuracy.

    • Originally planned for July, the NISAR launch may be delayed to October-November due to issues on the U.S. spacecraft side.

    About NISAR Satellite:

    • NISAR (NASA-ISRO Synthetic Aperture Radar) is a joint satellite mission between NASA and ISRO.
    • It would be a Low Earth Orbit observatory.
    • This mission is aimed at enhancing our understanding of Earth’s natural processes and environmental changes.

    Features of NISAR Satellite:

    • L-band and S-band Radar Frequencies:
        • NASA is responsible for the L-band radar, while ISRO provides the S-band radar.
        • This dual-band capability allows the satellite to monitor and measure Earth’s surface with high precision in all weather conditions and throughout both day and night.
    • Large Deployable Antenna: 
        • It is equipped with a large deployable antenna that measures 12 meters in diameter.
        • This large antenna enhances the satellite’s ability to capture detailed radar images with high resolution.
        • It will have a 39-foot stationary antenna reflector, made of a gold-plated wire mesh to focus radar signals emitted and received by the upward-facing feed on the instrument structure.
    • Rapid Coverage: 
        • NISAR is designed to scan the entire Earth every 12 days.
        • This rapid revisiting is crucial for observing and understanding temporal changes in the environment, such as shifting vegetation patterns, ice dynamics, and other critical parameters.
    • Versatile Monitoring Capabilities: 
      • It will monitor Earth’s ecosystems and dynamics, including forest biomass, ice sheet collapses, and natural hazards such as earthquakes, tsunamis, and volcanic eruptions.
      • Its radar system can penetrate vegetation and soil to provide three-dimensional reconstructions of structures and changes.

    PYQ:

    [2015] The term ‘IndARC’ sometimes seen in the news, is the name of?

    (a) An indigenously developed radar system inducted into Indian Defence.

    (b) India’s satellite to provide services to the countries of Indian Ocean Rim.

    (c) A scientific establishment set up by India in Antarctic region.

    (d) India’s underwater observatory to scientifically study the Arctic region.

  • AI Content Detectors to Combat Deepfakes

    Why in the News?

    During the General Elections 2024, the proliferation of AI-generated content (AIGC), including deepfake videos featuring prominent figures like Aamir Khan and Ranveer Singh, raised concerns about misinformation.

    What is Deepfake Technology?

    • It is a type of Artificial Intelligence used to create convincing images, audio and video hoaxes. Deepfakes often transform existing source content where one person is swapped for another.
    • Creating such content involves a technique known as Generative Adversarial Networks (GANs), comprising Artificial Neural Networks.

    Legal Safeguards in India:

    • The regulations under the IT Act of 2000 and 2021 requires social media intermediaries to promptly remove deepfake content. Failure to do so may result in imprisonment or fines.
      • Section 66D: It penalizes individuals for cheating through personation using communication devices or computer resources. (Imprisonment for up to 3 yrs and a fine of up to 1 lakh rupees)
      • Rule 3(1)(b)(vii): This rule mandates that social media intermediaries prevent the hosting of content impersonating others.
      • Rule 3(2)(b): This rule requires social media platforms to remove such content within 24 hours of receiving a complaint.

    Significance of Deepfake Technology:

    • Promotes Right to Expression: Deepfakes amplify voices of marginalised individuals, enabling them to share important messages. Recently, a video was created to deliver the final message of a journalist killed by the Saudi government, calling for justice.
    • Can contribute to the Education System: Online educators use deepfakes to bring historical figures to life for engaging lessons. For example, a video of Abraham Lincoln delivering his Gettysburg.
    • Provides Autonomy: Deepfakes empower individuals to control their digital identity and explore new forms of self-expression. For instance, the Reface App.
    • Provides a realistic experience: Artists leverage deepfakes for creative expression and collaboration, as seen in Salvador Dali’s interactive museum promotion. Deepfake tech enables realistic lip-syncing for actors speaking different languages, enhancing global accessibility and immersion in films.
    • Renovating old memories: Deepfakes aid in restoring old photos, enhancing low-quality footage, and creating realistic training materials for public safety.

    What are the limitations of Deepfake Technology?

    • Spreading False Information: Deepfakes can purposefully spread misinformation, influencing public opinion or elections, like the videos of politicians/celebrities can manipulate viewers and create confusion about important issues.
    • Frauds: Deepfake technology enables impersonation for financial frauds, tricking individuals into revealing sensitive information. They can also fuel harassment, especially targeting women, and lead to psychological distress.
    • Accuracy: While no AI detector guarantees 100% accuracy, tools like Originality.ai boast a 99% true positive rate. Detection models report probability scores, allowing for nuanced assessments despite inherent uncertainties.

    Future Scope:

    • Adversarial AI: Keeping pace with evolving generative AI models poses a significant challenge for content detectors.
    • Accessibility and Cost: With increased adoption and advancements, the accessibility and affordability of detection tools are expected to improve.

    PYQ:

    With the present state of development, Artificial Intelligence can effectively do which of the following? (2020)

    1.       Bring down electricity consumption in industrial units

    2.       Create meaningful short stories and songs

    3.       Disease diagnosis

    4.       Text-to-Speech Conversion

    5.       Wireless transmission of electrical energy

    Select the correct answer using the code given below:

    (a) 1, 2, 3 and 5 only

    (b) 1, 3 and 4 only

    (c) 2, 4 and 5 only

    (d) 1, 2, 3, 4 and 5

  • GPT-4o: A Free AI Model with Vision, Text, and Voice

    Why in the News?

    • OpenAI has launched GPT-4o- a version of the GPT-4 model which powers its ChatGPT.
    • It offers enhanced speed, intelligence, and efficiency across text, vision, and audio, revolutionizing human-to-machine interaction and opening up new possibilities for users worldwide.

    About GPT-4o:

    • GPT-4o offers GPT- 4 level intelligence with improved speed and efficiency, making human-to-machine interaction more natural and seamless.(focuses on emotional aspects)
    • It integrates transcription, intelligence, and text-to-speech functionalities seamlessly, eliminating latency and enhancing voice mode capabilities.

    Features of GPT-4o

    • Free Access for All: Previously available only to paid users, GPT-4o now provides advanced tools to all users, unlocking over a million GPTs from the GPT store and expanding possibilities for developers.
    • Multilingual and Vision Capabilities: GPT-4o supports over 50 languages and includes vision capabilities, enabling users to upload photos, documents, and access real-time information during conversations.
    • Real-time Conversations: It is able to understand user emotions and provide emotive styles of conversation in real-time.
    • Vision and Coding Support: GPT-4o can solve complex math problems, assist with coding queries, interpret complex charts, and analyze facial expressions in real-time.
    • Translation and Efficiency: GPT-4o offers live real-time translation capabilities and is two times faster, 50% cheaper, and offers 5 times higher rate limits compared to GPT-4 Turbo.

    PYQ:

    [2020] With the present state of development, Artificial Intelligence can effectively do which of the following?

    1. Bring down electricity consumption in industrial units
    2. Create meaningful short stories and songs
    3. Disease diagnosis
    4. Text-to-Speech Conversion
    5. Wireless transmission of electrical energy

    Select the correct answer using the code given below:

    (a) 1, 2, 3 and 5 only

    (b) 1, 3 and 4 only

    (c) 2, 4 and 5 only

    (d) 1, 2, 3, 4 and 5

  • What is 3D Printing and How does it Work?

    Why in the news?

    • The Indian Space Research Organisation (ISRO) successfully tested a liquid rocket engine made with the help of additive manufacturing technology — commonly known as 3D printing.

    3D Printed PS4 Engine

    • The technology helped ISRO bring down the number of parts in the engine from 14 to a single piece.
    • ISRO was able to eliminate 19 weld joints and saved 97% of raw material.
    • It also reduced the overall production time by 60%.

    What is 3D printing?

    • 3D printing is a process that uses computer-created design to make three-dimensional objects layer by layer.
    • It is an additive process, in which layers of a material like plastic, composites or bio-materials are built up to construct objects that range in shape, size, rigidity, and colour.
    • Common 3D Printing materials include Acrylonitrile Butadiene Styrene (ABS), Carbon Fiber Filaments, Conductive Filaments, Metal Filaments etc.

    How is 3D printing done?

    • To carry out 3D printing, one needs a personal computer connected to a 3D printer.
    • All they need to do is design a 3D model of the required object on computer-aid design (CAD) software and press ‘print’.
    • The 3D printer does the rest of the job.
    • 3D printers construct the desired object by using a layering method, which is the complete opposite of the subtractive manufacturing processes.

    Benefits offered:

    3D printing offers several key advantages over traditional manufacturing, including:

    • Complexity without Extra Cost: Allows for intricate designs without increasing production costs.
    • Rapid Prototyping: Speeds up the development process by quickly producing prototypes from digital designs.
    • Customization: Ideal for producing customized or bespoke items in small quantities.
    • Reduced Waste: Generates minimal waste compared to traditional subtractive methods, making it more sustainable.
    • Cost-Effective for Low Volumes: Avoids the need for expensive tooling and molds, beneficial for small production runs.

    PYQ:

    [2018] “3D printing” has applications in which of the following?

    1. Preparation of confectionery items
    2. Manufacture of bionic ears
    3. Automotive industry
    4. Reconstructive surgeries
    5. Data processing technologies

    Select the correct answer using the code given below:

    (a) 1, 3 and 4 only

    (b) 2, 3 and 5 only

    (c) 1 and 4 only

    (d) 1, 2, 3, 4 and 5

  • Artificial Rain through Cloud Seeding

    Why in the news?

    The Uttarakhand government faced scrutiny from the Supreme Court following Forest fires that claimed lives in the state.

    • Justices highlighted the inefficacy of relying solely on cloud-seeding or rain gods to address the crisis.

    Case Study: Experimenting Artificial Rain in India

    • A recent study published in the Bulletin of the American Meteorological Society (BAMS) highlighted the success of a cloud seeding trial in Maharashtra’s Solapur region, which resulted in an 18% increase in rainfall compared to normal patterns.
    • Scientists from the Indian Institute of Tropical Meteorology in Pune and other institutes conducted this study.
    • The experiment targeted warm convective clouds with a height above zero degrees Celsius, releasing calcium chloride particles to stimulate rainfall.
    • Spanning from 2017 to 2019, the experiment analyzed 276 clouds using advanced tools like automatic rain gauges, radars, radiometers, and aircraft.
    • Glaciogenic seeding, attempted in clouds containing both ice and water, did not significantly impact rainfall at the seeding location, according to the study’s findings.

    About Cloud-Seeding

    • Cloud seeding is a weather modification technique aimed at altering precipitation patterns by dispersing substances into clouds to stimulate rainfall or snowfall.
    • It is used to mitigate hail, disperse fog, and either induce precipitation or prevent it from occurring in subsequent days.
    • It involves the dispersal of substances like silver iodide, potassium iodide, dry ice, and hygroscopic materials such as table salt into the atmosphere.
    • Techniques include:
    1. Static seeding: promotes ice particle formation in supercooled clouds, and
    2. Dynamic seeding: enhances convective cloud development through the release of latent heat.
    • Dispersion methods range from aircraft and ground-based generators to newer approaches like drones delivering electric charges or infrared laser pulses.

    Limitations: Impact on Environment and Health

    • Concerns persist regarding the potential accumulation of seeding agents in sensitive ecosystems, although detailed studies have shown negligible impacts.
    • The chemicals used, such as silver iodide, may potentially damage the environment and cause health issues like iodine poisoning in high concentrations

    PYQ:

    [2019] In the context of which of the following do some scientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into stratosphere?

    (a) Creating the artificial rains in some regions

    (b) Reducing the frequency and intensity of tropical cyclones

    (c) Reducing the adverse effects of solar wind on the Earth

    (d) Reducing the global warming

  • CRISPR’s Breakthrough in Treating Blindness

    Why in the news?

    Scientists have successfully used CRISPR-Cas9 gene editing to restore vision in individuals with a rare form of inherited or congenital blindness.

    • The groundbreaking clinical trial, named “BRILLIANCE,” demonstrated promising results in improving vision and quality of life for participants with Leber congenital amaurosis (LCA), a severe vision disorder.

    What is Leber Congenital Amaurosis (LCA)?

    • LCA is a rare genetic disorder that primarily affects the retina the ‘light-sensitive’ tissue at the back of the eye. It leads to severe visual impairment or blindness at birth or within the first few months of life.
    • It is inherited in an autosomal recessive manner, meaning a child needs to inherit one defective gene from each parent to develop the condition.
    • There are several genes associated with LCA, with mutations in at least 14 different genes known to cause the disorder.
    • These genes generally affect the development and function of photoreceptors or the retinal pigment.

    Key highlights of the BRILLIANCE trial:

    • The BRILLIANCE trial involved 12 adults and two children diagnosed with LCA, a condition characterized by early-onset vision loss.
    • Participants received a single dose of a CRISPR gene therapy called EDIT-101, designed to correct mutations in the CEP290 gene responsible for LCA.
    • In this case, CRISPR-Cas9 cuts out the faulty DNA segment in the CEP290 gene and replaces it with a healthy DNA sequence, restoring the function of the CEP290 protein crucial for vision.
    • Out of 14 participants, 11 experienced improved vision without serious side effects.

    Back2Basics: CRISPR-Cas9 Gene Editing

    • CRISPR-Cas9 stands for Clustered Regularly Interspaced Short Palindromic Repeats and CRISPR-associated protein 9.
    • It is a technology that allows geneticists and researchers to edit parts of the genome by altering sections of the DNA sequence.
    • Emmanuelle Charpentier and Jennifer Doudna’s work on CRISPR-Cas9 as a ‘molecular scissor’ earned them the 2020 Nobel Prize in chemistry.
    • The system consists of two key components:
    1. Cas9: This is the enzyme that acts like a pair of molecular scissors. It is responsible for cutting the DNA strand at a specific location, allowing for the removal, addition, or alteration of DNA at that site.
    2. Guide RNA (gRNA): This is a piece of RNA that is designed to find and bind to a specific sequence of DNA that matches its code. The gRNA guides the Cas9 enzyme to the exact spot in the genome where an edit is desired.
    • Mechanism:
      • The process begins with the design of a gRNA that matches the DNA sequence where an edit is needed.
      • Once inside the cell, the Cas9 enzyme and the gRNA form a complex that can identify and bind to the target DNA sequence.
      • The Cas9 then cuts the DNA at this location.
      • After the DNA is cut, the cell’s natural repair mechanisms can be harnessed to add or remove genetic material, or to make specific changes to the DNA.

     

    PYQ:

    [2019] What is Cas9 Protein that is often mentioned in news?

    (a) A molecular scissors used in targeted gene editing

    (b) A biosensor used in the accurate detection of pathogens in patients

    (c) A gene that makes plants pest-resistant

    (d) A herbicidal substance synthesized in genetically modified crops

  • Catatumbo Lightning: A Torrent of Current

    Why in the news?

    Catatumbo lightning is a natural event seen over the Catatumbo River in Venezuela, where lightning strikes almost nonstop.

    What is Catatumbo Lightning?

    • Catatumbo Lightning is an atmospheric phenomenon that occurs over the Catatumbo River in Venezuela.
    • It specifically occurs at the Catatumbo Delta, where the river meets Lake Maracaibo.
    • It is known as one of the world’s largest lightning displays.
    • This natural spectacle involves frequent and nearly continuous lightning strikes that illuminate the night sky, creating a mesmerizing light show.
    • Catatumbo Lightning is most prevalent during the wet season, typically from April to November.
    • The consistent and abundant lightning activity has earned the region the moniker “the lightning capital of the world.”

    Factors behind Catatumbo Lightning

    • Weather Dynamics
    • Warm, moisture-laden air from the Caribbean Sea clashes with cooler air descending from the Andes mountains, creating a dynamic interplay of atmospheric forces.
    • This collision, accentuated by the local landscape, triggers rapid upward movement of warm air, leading to the formation of towering cumulonimbus clouds.
    • Electrical Charge Generation
    • Strong winds and temperature differentials within these clouds generate electrical charges.
    • Cumulonimbus clouds, towering over 5 km high, accumulate vast amounts of static electricity.
    • Lightning Discharge: When the electrical potential within the clouds reaches a critical level, it discharges in the form of lightning strikes.

    Characteristics of Catatumbo Lightning

    • Catatumbo lightning occurs on approximately 160 nights annually, exhibiting a remarkable longevity.
    • At its peak, the phenomenon generates an astonishing average of 28 lightning strikes per minute.

    PYQ:

    [2013] During a thunderstorm, the thunder in the skies is produced by the

    1. Meeting of cumulonimbus clouds in the sky

    2. Lightning that separates the nimbus clouds

    3. Violent upward movement of air and water particles

    Select the correct answer using the codes given below:

    (a) 1 only

    (b) 2 and 3

    (c) 1 and 3

    (d) None of the above produces the thunder

  • Endosymbiotic Theory and Symbiogenesis

    Why in the news?

    • The endosymbiotic theory suggests that tiny structures in cells called mitochondria and chloroplasts were once independent bacteria.
    • A biologist named Lynn Margulis came up with the idea that cells merged with bacteria, challenging the usual belief that evolution happens mainly through genetic changes.

     What is the Endosymbiotic Theory?

    • The endosymbiotic theory proposes that organelles like mitochondria and chloroplasts were once free-living bacteria engulfed by recipient cells.
    • American biologist Lynn Margulis introduced Symbiogenesis, challenging the Neo-Darwinist consensus on genetic mutations driving evolution.
    • Margulis’s Struggle:
    1. Margulis’s manuscript on symbiogenesis faced rejection by academic journals before finally being published in The Journal of Theoretical Biology in 1967.
    2. It took years for mitochondria and chloroplasts to be acknowledged as former free-living bacteria turned endosymbionts.

    Recent Discoveries and Endosymbiotic Theory

    • Recent papers published in Science and Cell have reignited interest in the endosymbiotic theory.
    • The focus is on nitrogen fixation, crucial for proteins and DNA in living organisms.
    • Despite abundant atmospheric nitrogen, plants lack the means to utilize it efficiently.
    • Legumes host nitrogen-fixing bacteria in root nodules, aiding in ammonia production for plant use.

    Evolution of Nitroplast

    • Cyanobacterium UCYN-A was found in marine algae, establishing a symbiotic relationship.
    • Nitroplast, a new organelle, co-evolved with its host cell, satisfying criteria for organelle classification.
    • Nitroplast integrates into host cell function and architecture, imports host cell proteins, synchronizes growth, and is inherited during cell division.
    • Nearly half of nitroplast proteins are derived from the host cell.

    Nitrogen Cycle:


    The nitrogen cycle is a crucial biogeochemical cycle that describes the transformation and circulation of nitrogen in various forms within ecosystems. It involves several key steps:

    1. Nitrogen Fixation: This is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) or nitrate (NO3-) ions, which are forms of nitrogen that plants can utilize. Nitrogen fixation can occur through biological, atmospheric, and industrial processes. In biological nitrogen fixation, certain bacteria like Rhizobium spp. in the root nodules of leguminous plants or cyanobacteria convert N2 into ammonia.
    2. Ammonification: Ammonification is the process by which organic nitrogen compounds from dead organisms, feces, and other waste materials are converted into ammonia by decomposer organisms like bacteria and fungi during the decay process.
    3. Nitrification: Nitrification is the biological oxidation of ammonia (NH3) or ammonium (NH4+) to nitrite (NO2-) and then to nitrate (NO3-) by nitrifying bacteria such as Nitrosomonas and Nitrobacter. This process occurs in aerobic conditions and plays a crucial role in making nitrogen available to plants.
    4. Assimilation: Plants and other organisms take up ammonia, nitrate, or organic nitrogen compounds from the soil to use them in synthesizing proteins, nucleic acids, and other vital nitrogen-containing compounds.
    5. Denitrification: Denitrification is the process by which nitrate (NO3-) is converted back into nitrogen gas (N2) or nitrous oxide (N2O) by denitrifying bacteria under anaerobic conditions. This step completes the cycle by returning nitrogen to the atmosphere, closing the loop.
    6. Ammonium Ionization: In soils and aquatic environments, ammonium ions (NH4+) may undergo ionization, converting to ammonia gas (NH3), which can volatilize and return to the atmosphere.

    Significance of the Nitroplasts

    • Agriculture: Nitroplasts offer potential solutions for reducing the harmful effects of industrial ammonia production.
    • Biotechnology: Biotechnological applications may include engineering host cells and nitroplasts for efficient nitrogen fixation in plants.

    PYQ:

    [2021] In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?​

    (a) Carbon cycle

    (b) Nitrogen cycle

    (c) Phosphorus cycle

    (d) Sulphur cycle

  • [pib] SPACE Testing & Evaluation hub for Sonar Systems

    Why in the news?

    A state-of-the-art SPACE testing and evaluation hub for sonar systems, designed for the Indian Navy, was inaugurated by DRDO.

    About Submersible Platform for Acoustic Characterisation and Evaluation (SPACE)

    • The SPACE is located at the Underwater Acoustic Research Facility in Kulamavu, Idukki, Kerala.
    • It is developed by the Naval Physical & Oceanographic Laboratory of DRDO.
    • It is set to become a premier testing and evaluation hub for sonar systems deployed on various Indian Navy platforms, including ships, submarines, and helicopters.

    Key Features of SPACE:

    • SPACE comprises two distinct components:
    1. Floating Platform on the water surface and
    2. Submersible platform capable of descending to depths of up to 100 meters using winch systems.
    • After completing operations, the submersible platform can be winched up and docked with the floating platform, ensuring efficient utilization of resources.

    Functions and Capabilities:

    • The primary function of SPACE is the evaluation of complete sonar systems, facilitating rapid deployment and retrieval of scientific packages such as sensors and transducers.
    • It will serve for surveying, sampling, and data collection of air, surface, mid-water, and reservoir floor parameters utilizing modern scientific instrumentation.
    • It will address the data processing and sample analysis requirements, ushering in a new era of Anti-Submarine Warfare research capabilities.

    What is SONAR?

    • SONAR stands for “Sound Navigation and Ranging.”
    • It’s a technique used for detecting and locating objects underwater by transmitting sound waves and analyzing the echoes they produce.

    Here’s how it works:

    1. Sound Transmission: A SONAR system sends out pulses of sound waves, typically at frequencies beyond the range of human hearing. These sound waves travel through the water and propagate in all directions.
    2. Object Detection: When the sound waves encounter an object underwater, such as a submarine, seafloor, or marine life, they reflect off the object and return to the SONAR system as echoes.
    3. Echo Reception: The SONAR system receives the echoes of the transmitted sound waves and measures the time it takes for them to return. By knowing the speed of sound in water and the time it takes for the echoes to return, the system can calculate the distance to the object.
    4. Data Analysis: The received echoes are processed and analyzed to create a visual representation of the underwater environment. This information helps operators identify and locate objects of interest, navigate safely, and map the seafloor.

     

    PYQ:

    [2020] “The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft,” The experiment in question refers to-

    (a) Voyager-2

    (b) New Horizons

    (c) LISA Pathfinder

    (d) Evolved LISA

  • Microbial Formulations for Enhanced Agricultural Productivity

    Why in the news?

    The Indian Institute of Spices Research (IISR), located in Kozhikode, has introduced and validated three new microbial formulations (Bactolime, Bactogypsum, and Trichogypsum) aimed at improving agricultural productivity.

    IISR Microbial Formulations

    • It leverages granular lime and gypsum to address soil pH issues while simultaneously delivering beneficial microorganisms.
    • These are developed using IISR’s proprietary patent-applied technology.
    • The formulations are:
    1. Bactolime:
    • Bactolime, the flagship product, combines beneficial bacteria, specifically plant growth-promoting Rhizobacteria, with liming material in a single formulation.
    • This integration ensures not only the correction of soil acidity but also the provision of essential nutrients to plants.
    1. Bactogypsum and Trichogypsum:
    • The other two formulations, Bactogypsum and Trichogypsum, utilize gypsum as a base material to buffer soil pH to a near-neutral level.
    • By creating an optimal environment for beneficial microbes, these formulations improve soil structure, enhance the availability of secondary nutrients, and boost overall microbial activity.

    Back2Basics: Soil Microbes

    Soil microbes refer to microorganisms that inhabit the soil environment and play vital roles in soil health, nutrient cycling, and plant growth. These microorganisms are diverse and include bacteria, fungi, archaea, protozoa, and algae.

    Function Benefits
    Nitrogen-Fixing Bacteria Convert atmospheric nitrogen into ammonia, making it available to plants Enhance soil fertility, improve plant growth and yield
    Phosphate-Solubilizing Bacteria Solubilize insoluble phosphorus, making it available to plants Increase phosphorus availability, promote root development and flowering
    Mycorrhizal Fungi Form symbiotic relationships with plant roots, facilitate nutrient uptake Improve soil structure, enhance nutrient absorption, increase plant resilience
    Plant Growth-Promoting Rhizobacteria (PGPR) Stimulate plant growth, enhance nutrient uptake, suppress pathogens Promote root development, improve nutrient efficiency, increase stress tolerance
    Actinomycetes Decompose organic matter, produce antibiotics Enhance soil fertility, control soil-borne diseases and pests
    Azotobacter Fix atmospheric nitrogen, produce growth-promoting substances Increase nitrogen availability, stimulate root growth and nutrient uptake
    Azospirillum Fix atmospheric nitrogen, produce phytohormones Enhance nitrogen availability, promote root growth and stress tolerance
    Bacillus spp. Produce antimicrobial compounds, enzymes Control plant diseases and pests, improve soil health and fertility

     

    PYQ:

    [2016] Why does the Government of India promote the use of ‘Neem-coated Urea’ in agriculture?

    (a) Release of Neem oil in the soil increases nitrogen fixation by the soil microorganisms

    (b) Neem coating slows down the rate of dissolution of urea in the soil

    (c) Nitrous oxide, which is a greenhouse gas, is not at all released into atmosphere by crop fields

    (d) It is a combination of a weedicide and a fertilizer for particular crops