Plants store energy primarily in the form of chemical energy through the process of photosynthesis. Here’s how it works and where the energy is stored:

1. Photosynthesis Process:
   • Plants capture sunlight using a pigment called chlorophyll, found in chloroplasts.
   • Using sunlight, they convert carbon dioxide (CO₂) from the air and water (H₂O) from the soil into glucose (C₆H₁₂O₆), a simple sugar, and release oxygen (O₂) as a byproduct.
2. Energy Storage in Glucose:
   • The glucose produced during photosynthesis acts as an immediate energy source.
   • When energy is needed, glucose undergoes cellular respiration to produce ATP (adenosine triphosphate), the usable energy currency of cells.
3. Conversion to Starch:
   • Excess glucose is converted into starch, a complex carbohydrate, for long-term storage. Starch is stored in:
     • Leaves
     • Roots (e.g., potatoes, carrots)
     • Stems
     • Seeds (e.g., rice, wheat, corn)
4. Oils and Fats:
   • In some plants (e.g., sunflower, soybean, and olive), glucose is converted into oils and fats for energy storage in seeds.
5. Cellulose:
   • Glucose is also used to synthesize cellulose, which is a structural component of the cell wall. While not used for energy storage, cellulose demonstrates how plants utilize the products of photosynthesis.

In summary, plants store energy in the form of starch and sometimes as oils and fats, ensuring they have reserves to fuel their growth, reproduction, and survival during unfavorable conditions.

Graded Response Action Plan (GRAP) restrictions are measures implemented to address varying levels of air pollution in Delhi-NCR, India. These restrictions are tiered based on the Air Quality Index (AQI) and come into effect depending on the severity of pollution, from “Moderate” to “Severe+” or “Emergency” levels.

Key GRAP Restrictions by Pollution Levels:

1. Moderate to Poor (AQI 201-300):
   • Enforce pollution control norms in industries.
   • Prohibit garbage burning.
   • Increase mechanical road sweeping and water sprinkling to control dust.
2. Very Poor (AQI 301-400):
   • Ban diesel generator sets, except for essential services.
   • Increase public transport availability to reduce private vehicle use.
   • Restrict certain industrial activities like brick kilns and stone crushers.
3. Severe (AQI 401-450):
   • Ban construction and demolition activities (except essential projects).
   • Halt operations of industries using non-clean fuels.
   • Introduce the odd-even vehicle rationing scheme if required.
4. Severe+ or Emergency (AQI 450+):
   • Ban the entry of trucks, except those carrying essential items.
   • Halt construction activities entirely.
   • Close schools and colleges.
   • Ban all non-essential activities contributing to pollution.

Purpose of GRAP Restrictions

• To mitigate pollution levels during critical periods.
• To prevent health risks associated with poor air quality.
• To create a systematic and enforceable plan for controlling emissions from various sources.

GRAP restrictions are reviewed and revised based on real-time air quality monitoring and seasonal trends, particularly during winter months when pollution spikes.

Yes, it is possible to prepare for the UPSC Civil Services Examination (CSE) while pursuing a PhD, but it requires careful planning, time management, and dedication. Here are some considerations and tips for balancing both:

1. Understand the Commitment Required for Both

• PhD: A PhD demands significant time for research, experiments, thesis writing, and meetings with your supervisor.
• UPSC Preparation: It requires comprehensive coverage of a vast syllabus, consistent answer writing practice, and staying updated with current affairs.

2. Assess Your Schedule

• Determine how much free time you have after meeting your PhD responsibilities. Utilize evenings, weekends, and holidays effectively for UPSC preparation.
• If your PhD work is highly demanding, consider pacing your UPSC preparation over a longer duration.

3. Leverage Overlapping Areas

• If your PhD subject aligns with any of the UPSC optional subjects or General Studies (e.g., Political Science, Geography, Sociology), it can reduce the preparation burden.
• Use your research skills to dive deeper into relevant topics and enhance your understanding of complex issues.

4. Follow a Structured Plan

• Set Realistic Goals: Divide the UPSC syllabus into manageable sections and assign specific timelines.
• Prioritize Topics: Focus on high-yield areas such as Polity, Economy, History, Geography, and Current Affairs.
• Daily Routine: Dedicate fixed hours daily to UPSC preparation, even if it’s only 2–3 hours.

5. Utilize Available Resources

• Opt for online classes or self-study materials if you cannot attend coaching due to your PhD schedule.
• Use mobile apps, podcasts, and YouTube channels to study during short breaks or while commuting.

6. Stay Updated

• Allocate time daily to read newspapers like The Hindu or Indian Express and follow a reliable current affairs magazine.

7. Answer Writing and Test Series

• Start practicing answer writing for Mains and attempting mock tests early, as this will help you internalize the syllabus and improve your presentation skills.

8. Manage Stress

• Balancing a PhD and UPSC preparation can be stressful. Incorporate activities like exercise, meditation, or hobbies to maintain mental well-being.

9. Take Guidance

• Seek advice from mentors or peers who have attempted UPSC during a PhD. Their experiences can offer valuable insights.

10. Flexibility and Backup Plan

• Be prepared for delays in completing your PhD or not clearing UPSC in your first attempt. Have a backup plan for your career.

Real-Life Examples

Several candidates such as Anna Sinha have successfully cleared UPSC while pursuing higher studies, including PhDs. Their success underscores the importance of discipline and a strategic approach.

With proper planning and perseverance, it is feasible to balance both pursuits effectively.

LiDAR, which stands for Light Detection and Ranging, is a remote sensing technology that uses laser light to measure distances and create highly detailed, three-dimensional maps of surfaces. Here’s a breakdown of how it works and its applications:

How LiDAR Works

1. Emission of Laser Pulses: A LiDAR system emits thousands of laser pulses per second toward a target area.
2. Measuring Distance: When these pulses hit an object (e.g., the ground, buildings, trees), they reflect back to the LiDAR sensor.
3. Time of Flight: By measuring the time taken for each pulse to return, the system calculates the distance between the sensor and the object. This is known as the “time of flight” method.
4. Data Processing: Each distance measurement (together with GPS location and orientation) is used to create a “point cloud,” which represents the 3D structure of the surveyed area.

Types of LiDAR

1. Airborne LiDAR: Mounted on airplanes or drones, it maps large terrains, including forests, coastlines, and urban areas.
2. Terrestrial LiDAR: Used on the ground, this type can be mounted on vehicles or tripods for detailed surveys of buildings, roads, and other infrastructure.

Applications of LiDAR

• Mapping and Topography: Widely used in creating detailed topographical maps for environmental studies, city planning, and civil engineering.
• Forestry: Assesses forest canopy structure, tree height, and biomass, useful in forest management.
• Autonomous Vehicles: Provides real-time, high-precision 3D mapping of surroundings for self-driving cars to detect obstacles and navigate safely.
• Archaeology: Detects hidden ruins or ancient settlements beneath dense vegetation.
• Coastal and Floodplain Mapping: Helps in analyzing coastal erosion, flood risks, and modeling water flow in flood-prone areas.

LiDAR is valued for its precision, versatility, and ability to work effectively in various lighting conditions, even at night.