eChapters

In meteorology, temperature is always referred to as the temperature of the air unless it is stated otherwise. There will always be exchange of heat in the atmosphere from a point at high temperature to a point at lower temperature. The transfer of heat through convection and radiation is always observed in the atmosphere whereas the conduction of heat takes place near the earth’s surface.

4.1 Diffusion of Heat

Heat diffuses (spreads) at different rates through different media, the rate at which diffusion of heat takes place is called thermal diffusivity. The thermal diffusinty of of some selected materials is given below:

One can see from the above table that iron has got higher diffusivity compared to wood. Suppose one end of iron rod is kept at hot temperature, the heat spreads faster in iron rod and the other end gets warmer quicker than in the case of a wooden stick which means that the transfer of heat is quicker in bodies with higher thermal diffusivity.

1. The technique of acquiring information about some object by recording devices, without being in physical contact with the object under study is_____________. (Remote sensing)
2. The term remote sensing was coined by ____________. (Ms. Evelyn Pruitt)
3. Father of Indian remote sensing is ________________. (Pisharoth Rama Pisharoty)
4. In remote sensing_____________ type of radiation is utilized for photography.(Infra red)
5. First aerial photograph was taken in 1858 by Felix Tournachon, known as ________, from a tethered ballon over the Bievre Valley in France. (Nadar)
6. Remote sensing systems which provide their own source of energy for illumination are known as_____________. (Active sensors)
7. _____________ sensors are very useful in detecting and mapping forest fires. (Thermal sensors)
8. Land cover classification using three levels of the scale of 1 : 100000 was developed by _____________agency. (NRSA)
9. The forest survey of India (FSI) conducts forest cover survey once in every_____________. (2 years)

1. A measure of the items in a random sample is known as_____________. (Statistics)
2. Most commonly used measure of central tendency is_____________. (Arithmetic Mean)
3. Mean deviation is the_____________, when calculated about median. (Least)
4. Arithmetic mean of central tendency is applied for calculation of_____________ and _____________. (Regression and Correlation coefficient)
5. Arithmetic mean and variance are always equal in_____________ distribution. (Poisson)
6. Geometric mean of central tendency is appropriate for_____________. (Index number)
7. _____________ is the sum of all values/ number of values. (Arithmetic mean)
8. Middle most item of all values is_____________. (Median)
9. _____________ measure of central tendency requires data arrangement in ascending or descending order for its estimation. (Median)

Research techniques are the various methods and tactics strategically used to collect the materials, record the observations and analyse the data for study. These approaches provide a structured framework for achieving research objectives and validate the findings.

Anatomy is the oldest scientific discipline of the medicine, which deals with the form and structure of the organisms. The first documented scientific dissection on the human body were carried out as early as in the third century BC in Alexandria. At that time anatomists explored anatomy through dissection of animals, primarily on pigs and monkeys. The first written evidence of anatomical terms and rational observations can be found in the Egyptian medical papyri. The work of Andreas Vesalius played a significant role in medical research and education. During the 19th century the research in anatomy increased due to discovery of microscopes which allowed in-depth studies of body tissues and their components. However, in the last 100 years due to technological innovations and the growing understanding of related sciences progress in anatomy took place at a much faster pace. A thorough knowledge of research techniques in anatomy is very important to perform systemic experiments to reach a definite conclusion. The technique should be selected according to the aim and field of research. Here we are going to discuss some of the important gross anatomical techniques.

Biodynamic farming, a holistic approach to agriculture pioneered by Rudolf Steiner, integrates ecological principles, cosmic rhythms, and spiritual practices into farming methods. While it offers numerous environmental and ethical benefits, biodynamic farming also faces various challenges and criticisms. This article examines the key challenges and criticisms associated with biodynamic farming, including scientific skepticism, economic feasibility, practical implementation issues, and market acceptance. Through a detailed analysis of these aspects, the article aims to provide a comprehensive understanding of the limitations and contentious aspects of biodynamic farming, offering insights into potential areas for improvement and future research.

FINGER MILLET (Eleusine coracana)
Fungal diseases
1) Blast
Symptoms: The above ground parts (leaf, leaf sheath, stems) of the plant exihibit the symptoms. The seedlings and adult plants are affected by the pathogen. Eye-shaped spots appear on leaf and leaf sheath having dark brown margin with ashy centre. These spots coalesce to form large patches and the leaves are blighted. Affected leaves wither prematurely and the seedlings may be killed. Lesions appear on the leaf blades, leaf sheaths and culms on adult plants and cause blightening.

Washing is typically the first step in the fruit and vegetable production process. In small-scale operations, this is usually done in basins with recirculating water or with still water that is regularly replaced. The goal of washing is to remove dirt and contaminants from the produce before it enters the processing line, preventing potential contamination of the raw materials.
The washing should be done with clean water, as pure as possible, and if needed, the water can be made potable by adding 10 ml of a 10% sodium hypochlorite solution for every 100 liters of water. It’s also important to use tools that ensure thorough cleaning of the produce, leaving no dirt behind for the next stages of processing.
THE VEGETABLE WASHING MACHINE'S PRINCIPLE
A vegetable washing machine was designed and manufactured with the needs of micro, small, and medium-scale vegetable growers in mind. The machine focuses on high washing capacity and efficiency, with stainless steel components used to ensure the quality of the washed produce. A durable primary frame was incorporated to maintain the machine’s structural integrity.
To enhance safety and ease of use, protective coverings were added around the moving parts, while also prioritizing ergonomic design and straightforward operation and maintenance. The machine features rollers for easy mobility, and as the vegetables move along the conveyor belt at a set speed, sprinklers spray water to clean them effectively.

Washing is typically the first step in the fruit and vegetable production process. In small-scale operations, this is usually done in basins with recirculating water or with still water that is regularly replaced. The goal of washing is to remove dirt and contaminants from the produce before it enters the processing line, preventing potential contamination of the raw materials.
The washing should be done with clean water, as pure as possible, and if needed, the water can be made potable by adding 10 ml of a 10% sodium hypochlorite solution for every 100 liters of water. It’s also important to use tools that ensure thorough cleaning of the produce, leaving no dirt behind for the next stages of processing.
THE VEGETABLE WASHING MACHINE'S PRINCIPLE
A vegetable washing machine was designed and manufactured with the needs of micro, small, and medium-scale vegetable growers in mind. The machine focuses on high washing capacity and efficiency, with stainless steel components used to ensure the quality of the washed produce. A durable primary frame was incorporated to maintain the machine’s structural integrity.
To enhance safety and ease of use, protective coverings were added around the moving parts, while also prioritizing ergonomic design and straightforward operation and maintenance. The machine features rollers for easy mobility, and as the vegetables move along the conveyor belt at a set speed, sprinklers spray water to clean them effectively.

Natural farming in India is based on core principles that advocate for harmony with nature, self-reliance, and ecological sustainability. More than a farming system, it represents a holistic philosophy that mirrors natural ecosystems in agricultural practices. Inspired by India’s traditional wisdom and promote prominently by Subhash Palekar through Zero Budget Natural Farming (ZBNF), it stands as a low-input, environmentally responsible alternative to chemicaldependent agriculture.
No external input is a fundamental principle of this approach. Farmers are encouraged to avoid chemical fertilizers and pesticides, instead utilizing resources available on the farm—such as cow dung, cow urine, compost, and herbal preparations—to maintain soil fertility and manage pests. This closed-loop system reduces reliance on market-purchased inputs and encourages farm-level self-sufficiency.
Soil regeneration is another key tenet, viewing the soil as a living system teeming with beneficial microbes. Techniques such as organic mulching, maintaining soil cover, and applying Jeevamrutha (a mixture made from cow dung, cow urine, jaggery, and pulse flour) enrich the soil microbiome. These practices improve soil structure, moisture retention, and nutrient availability, leading to healthier crops.
Seed treatment in natural farming avoids chemical coatings. Instead, Beejamrutha—a preparation made from cow dung, cow urine, lime, and native soil—is applied to seeds before sowing. This enhances seedling health, protects against disease, and promotes vigorous early growth, rooted in natural protection.
Natural pest management uses plant-based deterrents rather than synthetic chemicals. Preparations like neem oil, garlic extract, and Agniastra (made from cow dung, cow urine, tobacco, and chili) are applied to control pests. These reduce chemical residue in crops and help preserve beneficial insects and overall biodiversity.

A family of over 33 genera and 391 species, Nyctaginaceae are distributed mainly in tropics, but also in South America particularly Brazil, Asia, Ecuador, Peru, Columbia, Australia, Africa and New Zealand are the chief centers of distribution. Presently, bougainvilleas are popular ornamental plants in warm climates including India, Taiwan, Vietnam, Malaysia, Australia, Mediterranean region, the Caribbean, Mexico, South Africa, and the United States in Arizona, California, Florida, Hawaii, and southern Texas. Some of the largely represented genera along with the approximate number of their world over reported species are Bougainvillea (300), Mirabilis (60) and Pisonia (50). The C3 physiology recorded directly in Bougainvillea, Mirabilis.
Bougainvillea is a versatile and hardy climbing shrub commonly grown in Indian gardens. It is a short day plant. C3 and C4 photosynthesis is reported in bougainvillea cv. Mary Palmer. It is a fast growing garden plant admired for its brightly coloured bracts, profuse flowering round the year, wide adaptability to soil and climatic conditions, and easy growing. It is, grown as hedge, pergola, standard, pot plant, and bonsai for display. In city designs, newer roads, and flyovers are introduced with bougainvilleas as dividers. Bougainvilleas also have been utilized as a kind of folk medicine developed into dietary supplements as insulin substitute and for pollution tolerance. The insulin like compound, pinitol, was first isolated from leaves of B. spectabilis.

Introduction
Using short, single-stranded oligonucleotide strands complementary to the targeted mRNA, as RNA technology can regulate gene expression, leading to changes in phenotype, disease resistance, and other traits associated with protein expression profiles. Since gene function depends on expression, this technology can be used to silence genes and inhibit their expression. Because it can manipulate and regulate protein expression during its translation, it can knock out or down the expression of a gene of interest. As such, functional genomics can benefit from this technology as it allows for the regulation of protein expression.
Gene expression involves two main steps: transcription, in which the DNA sequence serves as a template to create an mRNA molecule, and translation, in which the mRNA is used as a template to synthesize a protein. The genes in DNA provide the instructions for making proteins, which are essential for the functions of the cell.
Polymer chain that transforms into an effective protein. The triplet code, which forms the basis of the genetic code, designates an amino acid for each codon made up of three nucleotides. Several enzymes, including together, enzymes such as polymerase, exonuclease, ligase, etc., unravel the DNA double helix and match RNA base pairs with DNA bases to create an RNA copy of the original DNA.

Bees are fundamental to maintaining ecological stability and enhancing agricultural output, making it vital to understand their diversity—especially in the context of natural farming systems. Different bee species vary in behavior, environmental adaptability, honey yield, and efficiency in pollination. India is home to several native and introduced bee species, each contributing uniquely to honey production and ecosystem health. Choosing a species for natural beekeeping depends on factors like climate, local flora, and whether the beekeeper’s goal is honey production, crop pollination, or species conservation.

Among these species, Apis dorsata—the rock bee—is a large, wild bee known for building single, exposed combs on high structures such as trees and cliffs. While it can produce up to 40 kg of honey per colony annually, its aggressive nature makes it unsuitable for domestication. In contrast, Apis cerana indica, the native Indian hive bee, is better adapted to India’s diverse climates and is compatible with low-maintenance, eco-conscious farming. Producing around 6–10 kg of honey per colony annually, it suits small-scale, sustainable practices.

Harvesting and processing natural honey are integral parts of beekeeping that demand attention to timing, technique, and ethical practices to protect both the integrity of the honey and the well-being of the bees. In natural farming systems, the emphasis lies not only on honey yield but also on maintaining balance with the surrounding environment and the bees themselves. Natural honey is prized for its pure quality, medicinal benefits, and nutritional richness, which can only be safeguarded through traditional, low-intervention approaches. The central objective is to harvest only the surplus honey, ensuring colonies retain sufficient reserves to sustain themselves through adverse seasons.

Honey is usually harvested after the flowering season, once nectar flow has been abundant and bees have stored ample honey for their use. A key tenet of natural beekeeping is to avoid stripping the hive entirely of its reserves, thereby safeguarding the colony’s survival. Mature honey is collected from capped combs, which signal that the honey has reached the correct moisture content. In contrast to commercial methods that may rely on chemicals or excessive smoke to drive bees away, natural beekeeping encourages gentle handling using a bee brush or a small amount of smoke to move bees without causing them distress.

To elevate natural beekeeping from a basic subsistence activity to a sustainable and profitable venture, strong marketing approaches and entrepreneurial drive are essential. These elements enable producers to expand their customer base, enhance the value of their offerings, and establish distinctive brands that reflect the purity and ecological integrity of their products.

There is increasing interest in natural bee products both within India and globally, fueled by heightened consumer awareness around health, sustainability, and eco-friendly lifestyles. Beekeepers must identify and understand their core markets—ranging from local health-conscious buyers and organic stores to international importers—and align their product presentation, packaging, and positioning to meet specific consumer preferences. Conducting market research can help pinpoint specialized segments like organic-certified honey, therapeutic propolis, or royal jelly supplements.

Entrepreneurial opportunities go beyond harvesting raw honey. Value addition can take many forms: creamed or infused honey, honeycomb packs, artisanal beeswax candles, cosmetic products made with propolis, or balms infused with bee-derived ingredients. Packaging innovations, sustainability certifications, and appealing brand narratives further enhance consumer trust and market differentiation. Diversifying products also helps minimize risk and stabilize income.

Government schemes, policies, and training initiatives serve as vital enablers for the expansion of natural beekeeping, offering essential financial, technical, and institutional support to farmers and rural entrepreneurs. These interventions are designed to enhance productivity, sustainability, and economic resilience, particularly among smallholders, tribal communities, and women.

Subsidies and grant-based programs help reduce entry barriers by covering costs related to indigenous and modern hive types, protective gear, and honey processing equipment. This financial assistance empowers marginal farmers to embrace beekeeping while supporting certification and branding efforts that connect them with higher-value markets.

Beekeeping is now officially recognized within national and state-level agricultural policy as a key allied activity that promotes biodiversity and strengthens rural livelihoods. These policies often integrate natural beekeeping within wider organic farming frameworks and support food safety regulations, quality assurance, and export facilitation.

Government-led training programs—delivered through agricultural universities, extension networks, and specialist institutions—equip beekeepers with knowledge on colony management, disease control, and sustainable harvesting. These sessions emphasize natural methods that avoid synthetic inputs, safeguarding both pollinator health and ecological integrity.

Aquarium hardscaping is the craft of arranging rocks, driftwood, and other structural elements to create a natural-looking and visually appealing underwater environment. This design process goes beyond aesthetics—it’s about crafting a balanced habitat that mimics nature and supports aquatic life. Aquarium plants and hardscape form the foundation of aquascaping. While plants add color, texture, and movement, they also play essential ecological roles by producing oxygen, absorbing nutrients, stabilizing water conditions, and offering shelter and breeding sites. Whether it’s low-growing carpets like
Hemianthus callitrichoides or tall background plants like Vallisneria, aquatic flora turns a simple tank into a dynamic ecosystem.
Hardscaping uses inanimate materials—rocks, driftwood, and decorative structures—to simulate riverbeds, forests, or mountain-like terrains. It shapes the aquascape’s layout, provides hiding spots, and defines territories, helping to reduce stress among fish.
A successful aquascape depends on harmony between plants and hardscape. Selections should be based on tank dimensions, lighting, water chemistry, and the needs of the species being kept. Materials must be safe, stable, and non-toxic. Knowing how plants grow—whether rooted or floating—and how they interact with their surroundings is vital to achieving a sustainable, beautiful aquarium.
IMPORTANCE OF AQUATIC PLANTS IN OXYGENATION
AND AESTHETICS
Aquatic plants are essential components of an aquarium, offering both ecological and visual benefits. Functionally, they improve water quality by producing oxygen and removing excess nutrients such as nitrates and carbon dioxide. Aesthetically, these plants create a more natural and appealing underwater environment, enhancing the overall visual experience of the aquarium.

Lighting and water quality are closely linked elements of aquarium maintenance that significantly affect both the well-being of aquatic organisms and the tank’s overall appearance. Proper lighting enhances visibility, influences fish behavior, supports plant growth through photosynthesis, and helps manage algae levels.
The choice of lighting should correspond to the specific type of aquarium—be it a simple freshwater setup, a densely planted tank, or a reef environment. Key factors to consider include light intensity, color temperature (in Kelvin), and the duration of daily exposure. LED lighting has become a favored option thanks to its energy efficiency, adjustable settings, and minimal heat production. Maintaining water quality involves regulating essential parameters such as temperature, pH, general and carbonate hardness (GH/KH), ammonia, nitrite, nitrate, and oxygen levels. Neglecting these can lead to fish stress and illness.
Routine care includes water changes, effective filtration, gravel cleaning, and regular testing.
Coordinating lighting and water conditions prevents issues like algae overgrowth, plant decline, and fish loss. A balanced, integrated strategy promotes a healthy and visually appealing aquatic environment.
TYPES OF LIGHTS: FLUORESCENT, LED, FULL-SPECTRUM
In its most basic role, aquarium lighting allows hobbyists to view the tank’s inhabitants. However, its more essential purpose is supplying necessary energy for photosynthetic plants and animals. As the main—often only—light source, appropriate lighting is crucial in aquariums containing organisms like corals, anemones, and aquatic plants. It also affects the behavior and physiology of fish, playing a significant role in maintaining the health and balance of the entire aquarium environment.

Specialized aquariums are designed to meet particular environmental conditions or aesthetic preferences, presenting both distinct opportunities and challenges for aquarists. The three primary categories include planted tanks, biotope aquariums, and marine (saltwater) systems.
Planted tanks are densely populated with live aquatic plants and require precise management of lighting, CO? levels, nutrient-rich substrates, and fertilizers. These aquariums closely resemble natural freshwater environments and are especially favored in the aquascaping community. In addition to their beauty, they help improve water quality by producing oxygen and absorbing excess nutrients. Biotope aquariums aim to authentically recreate specific natural ecosystems like the Amazon basin, African Rift Valley lakes, or Southeast Asian freshwater streams. These tanks feature native fish, local plants, appropriate substrates, and water chemistry specific to the chosen habitat, making them ideal for education, conservation, and scientific observation.
Marine aquariums support saltwater life and involve more complex care. They require strict control of salinity, buffering capacity, and filtration using advanced systems such as protein skimmers. These setups may be dedicated to fish, coral reefs, or a mix of marine species. Though more expensive and demanding, marine tanks offer vibrant biodiversity and striking visual appeal. Each of these aquarium styles has unique care requirements, attracting hobbyists with different goals—whether artistic expression, ecological simulation, or marine biology.

Introduction
The ecosystem recycles nutrients. Approximately forty chemical elements are thought to be necessary for the existence of living things. The earth’s system contains finite materials, hence the only way to maintain it functioning continually is to regenerate the components.
Definition
The term “biogeochemical cycle” refers to the periodic transfer of elements between living organisms (the biotic phase) and their non-living ,(abiotic) environments, such as rocks, water, and air. These cycles, which primarily involve water, oxygen, carbon, nitrogen, and phosphorus, are essential to life.
While micronutrients like Cu, Fe, and Co are derived from soil-based edaphic cycles, macronutrients like C, H, O, P, K, N, S, Mg, and Ca are cyclized with the atmosphere.There are two types of bio-geochemical cycles: gaseous and sedimentary cycles. The soil serves as the primary reservoir for nutrients in sedimentary cycles, such as the phosphorus and sulfur cycles, while the atmosphere and oceans serve as the primary reservoirs for nutrients in gaseous cycles, such as the nitrogen, carbon, and oxygen cycles. The biotic and abiotic systems are involved in both cycles. Both are fueled by energy flow and connected to either the hydrologic or water cycles.
• The nitrogen cycle, which involves gaseous components, is the naturalprocess by which nitrogen and nitrogen-containing molecules are transformed.

Introduction
Marine Pollution
The pollution of the sea substances that humans have directly or indirectly introducedinto the marine environment, which can have negative impacts on the ecosystem, including health risks to people, obstructions to marine activities, and a decline in the quality of seawater.
It happens when invading species or chemicals or particles or garbage from industry, agriculture, or residential sources find their way into the ocean and can have detrimental impacts.
The majority of maritime pollution originates on land. Nonpoint causes of pollution include wind-blown debris and agricultural runoff.
A great deal of potentially harmful substances stick to small particles, which plankton and benthos animals (most of which are deposit or filter feeders) then consume.
Pesticides swiftly find their way into marine food webs after entering the marine ecology. These pesticides can induce diseases and mutations once they enter food webs, which can be dangerous for both humans and the entire food chain.
Marine food webs may also be exposed to toxic metals. These have the power to alter biochemistry, behavior, reproduction, tissue composition, and growth inhibition in marine organisms. Additionally, a lot of animal diets contain a lot of fish meal or fish hydrolysate. Toxins from the sea can thus spread to land animals and then show up in meat and dairy products.