← Combined Technical (NG)
Past Questions — 2025
Which of the following is a method of pollination control in hybrid seed production?
A)
Protogyny
B)
Protandry
C)
Male sterility
D)
Cleistogamy
In hybrid seed production, the primary goal is to prevent self-pollination and ensure cross-pollination between two specific parent lines. This is achieved through 'pollination control' mechanisms.
1. **Male Sterility (Correct):** This is a widely used method of pollination control. By using a male-sterile line as the female parent, the production of viable pollen is prevented, making it impossible for the plant to self-pollinate. This forces the plant to receive pollen from the desired male parent, ensuring 100% hybridity in the resulting seeds. Common types include Genetic Male Sterility (GMS), Cytoplasmic Male Sterility (CMS), and Cytoplasmic-Genetic Male Sterility (CGMS).
2. **Protogyny (Incorrect):** This is a natural condition where the stigma becomes receptive before the pollen is shed from the anthers. While it promotes outcrossing, it is a biological trait of the species rather than a controlled method used by breeders to ensure hybrid purity in seed production.
3. **Protandry (Incorrect):** This is the opposite of protogyny, where pollen is shed before the stigma becomes receptive. Like protogyny, this is a natural mechanism to avoid selfing, not a controlled breeding tool for hybrid seed production.
4. **Cleistogamy (Incorrect):** This is a condition where flowers do not open, forcing self-pollination. This is the exact opposite of what is required for hybrid seed production, which requires cross-pollination.
Which of the following is a primary tillage implement?
A)
Cultivator
B)
Harrow
C)
Plough
D)
Seed drill
Tillage is categorized into primary and secondary tillage based on the intensity and purpose of the soil operation.
1. **Primary Tillage**: This is the first soil operation performed after harvest. Its main purpose is to open, loosen, and turn the soil to a significant depth to bury weeds and crop residue. The **Plough** (e.g., Moldboard plough, Disc plough) is the classic primary tillage implement used for this purpose.
2. **Secondary Tillage**: These operations are performed after primary tillage to further refine the soil, break clods, level the surface, and prepare a fine seedbed.
- **Cultivators** (Option a) are used for seedbed preparation and weed control, making them secondary tillage tools.
- **Harrows** (Option b) are used to pulverize the soil and smooth the surface, making them secondary tillage tools.
- **Seed drills** (Option d) are sowing implements used for placing seeds in the soil; they are not tillage implements but planting equipment.
Therefore, the Plough is the only primary tillage implement listed.
KVKs are established at the:
A)
Village level
B)
Block level
C)
District level
D)
State level
KVK stands for Krishi Vigyan Kendra (Farm Science Centre). These are agricultural extension centres established to provide technical knowledge and demonstrate new technologies to farmers.
1. **Organizational Structure**: KVKs are designed to operate at the District level to ensure that scientific research from agricultural universities (ICAR) reaches the local farming community effectively.
2. **Purpose**: Their primary goal is to bridge the gap between research and the farmer through 'learning by doing' and 'seeing is believing' approaches.
3. **Why other options are incorrect**:
- **Village level**: Extension activities reach the village level through frontline demonstrations and field visits, but the administrative center (KVK) is not located in every village.
- **Block level**: While some extension services (like the ATMA model) operate at the block level, KVKs are strategically placed to cover an entire district.
- **State level**: State-level coordination is handled by State Agricultural Universities (SAUs) or the Department of Agriculture, whereas KVKs are the operational units at the district level.
Which of the following is a characteristic of a genetically pure line?
A)
High heterozygosity
B)
Uniformity in traits across generations
C)
High genetic diversity
D)
Ability to adapt to various environments
A genetically pure line (also known as a pure-breeding line or homozygous line) is a population of organisms that are genetically identical and homozygous at all relevant loci.
1. Why Option (b) is correct: Because a pure line is homozygous, self-pollination or mating between individuals of the same line results in offspring that are genetically identical to the parents. This leads to high phenotypic and genotypic uniformity across successive generations.
2. Why Option (a) is incorrect: High heterozygosity is a characteristic of hybrids or genetically diverse populations, not pure lines. Pure lines are characterized by high homozygosity.
3. Why Option (c) is incorrect: Genetic diversity refers to the variation of genes within a population. A pure line, by definition, lacks genetic diversity because all individuals are genetically identical.
4. Why Option (d) is incorrect: While some pure lines may be adaptable, the 'ability to adapt to various environments' (plasticity or broad adaptation) is not a defining characteristic of genetic purity. In fact, highly specialized pure lines often have narrower adaptation ranges compared to genetically diverse populations (which benefit from the 'buffering' effect of diversity).
The process of removing field heat from harvested produce is known as:
A)
Pre-cooling
B)
Curing
C)
Ripening
D)
Fermentation
Step-by-step reasoning: 1. Field heat refers to the internal heat present in agricultural produce at the time of harvest, which accelerates respiration and transpiration, leading to faster spoilage. 2. Pre-cooling is the rapid removal of this field heat immediately after harvest to lower the temperature of the produce to its optimum storage temperature. This slows down metabolic processes and extends shelf life. 3. Analysis of other options: (b) Curing is a process used for certain crops (like onions, garlic, or potatoes) to dry the outer skins and heal wounds to prevent decay, not specifically to remove field heat. (c) Ripening is the physiological process by which fruit becomes edible. (d) Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes/microorganisms. Therefore, pre-cooling is the only correct term for removing field heat.
Break-even analysis in farm management is used to:
A)
Determine crop yield only
B)
Identify the level of production where total cost equals total revenue
C)
Calculate soil fertility
D)
Estimate labour requirement
Break-even analysis is a fundamental tool in farm management and economics used to determine the 'Break-Even Point' (BEP). The BEP is the specific volume of production or sales at which the total revenue generated from the farm enterprise exactly equals the total costs (both fixed and variable) incurred. At this point, the farm makes zero profit and zero loss.
Reasoning for other options:
- Option (a) is incorrect because crop yield is a physical measurement of production, not a financial analysis of costs and revenues.
- Option (c) is incorrect because soil fertility is a biological/chemical property of the land, measured through soil testing, not financial analysis.
- Option (d) is incorrect because labour requirement is part of resource planning and budgeting, whereas break-even analysis focuses on the financial viability of the production level.
Deficiency of which nutrient causes interveinal chlorosis in young leaves?
A)
Nitrogen
B)
Iron
C)
Magnesium
D)
Manganese
To solve this question, we must consider two key factors: the symptom (interveinal chlorosis) and the location of the symptom (young leaves).
1. **Interveinal Chlorosis**: This is a condition where the leaf tissue between the veins turns yellow (chlorotic), while the veins themselves remain green. This is characteristic of deficiencies in Iron (Fe), Magnesium (Mg), and Manganese (Mn).
2. **Mobility of Nutrients**: This determines where the deficiency first appears.
- **Mobile Nutrients**: Nutrients like Nitrogen (N), Phosphorus (P), Potassium (K), and Magnesium (Mg) can be translocated from old leaves to new growth. Therefore, deficiency symptoms appear first in **older leaves**.
- **Immobile Nutrients**: Nutrients like Iron (Fe), Calcium (Ca), and Sulfur (S) cannot be easily moved from old tissues to new ones. Therefore, deficiency symptoms appear first in **young leaves**.
3. **Evaluating the Options**:
- **Nitrogen (a)**: Mobile nutrient. Causes general chlorosis (entire leaf turns pale) starting in older leaves.
- **Iron (b)**: Immobile nutrient. Causes distinct interveinal chlorosis specifically in **young leaves**. This matches both criteria.
- **Magnesium (c)**: Mobile nutrient. Causes interveinal chlorosis, but it appears in **older leaves** first.
- **Manganese (d)**: Relatively immobile, but its chlorosis is often more irregular or spotted compared to the classic interveinal pattern of Iron, and Iron is the primary textbook answer for this specific combination of symptoms.
The first organized agricultural extension work in India before Independence began with which program?
A)
Intensive Agricultural District Programme (IADP)
B)
Community Development Programme (CDP)
C)
Grow More Food Campaign
D)
National Extension Service (NES)
Step-by-step reasoning:
1. The question asks for the first organized agricultural extension work in India *before Independence* (pre-1947).
2. Analysis of options:
- (a) Intensive Agricultural District Programme (IADP): Launched in 1960-61, well after independence.
- (b) Community Development Programme (CDP): Launched on October 2, 1952, after independence.
- (c) Grow More Food (GMF) Campaign: Launched in 1942-43 during World War II to increase food production to meet the demands of the war and combat famine. This is recognized as the first organized effort toward agricultural extension in India.
- (d) National Extension Service (NES): Launched in 1953 to strengthen the CDP, after independence.
3. Conclusion: The Grow More Food Campaign is the only option that fits the 'before Independence' criteria and represents the earliest organized extension effort.
The principle of Learning by Doing in agricultural extension is most closely associated with:
A)
Demonstrations
B)
Farm journalism
C)
Rural sociology
D)
Farm mechanization
The principle of 'Learning by Doing' is a cornerstone of experiential learning in agricultural extension. It posits that farmers are more likely to adopt a new technology or practice if they participate in the process and see the results firsthand.
1. Why 'Demonstrations' is correct: Method demonstrations (showing how to do something) and Result demonstrations (showing the outcome of a practice) are specifically designed to implement 'Learning by Doing.' By physically engaging in the activity or observing a practical application on a field, the learner gains practical skills and confidence, which is the essence of this principle.
2. Why other options are incorrect:
- Farm journalism (b) is a mass communication tool (e.g., newsletters, radio) which focuses on 'Learning by Hearing/Reading,' not doing.
- Rural sociology (c) is the academic study of social organization and behavior in rural areas; it is a foundational science for extension, not a teaching method.
- Farm mechanization (d) refers to the application of machinery to farming. While one can 'learn by doing' while using a machine, mechanization itself is a subject/tool, not an extension principle or teaching methodology.
The first Krishi Vigyan Kendra (KVK) in India was established in 1974 at:
A)
Ludhiana
B)
Pondicherry
C)
Pune
D)
Hyderabad
The Krishi Vigyan Kendra (KVK) or 'Farm Science Centre' program was launched by the Indian Council of Agricultural Research (ICAR) to provide vocational training and technical support to farmers. The very first KVK was established in 1974 at Pondicherry (now Puducherry) as a pilot project to test the effectiveness of the 'Training and Visit' (T&V) system and the concept of a district-level agricultural extension center.
Analysis of other options:
- Ludhiana: Known for the Punjab Agricultural University (PAU) and its role in the Green Revolution, but not the site of the first KVK.
- Pune: A major hub for agricultural research (e.g., Mahatma Phule Krishi Vidyapeeth), but not the site of the first KVK.
- Hyderabad: Home to many national research institutes (like ICRISAT), but not the site of the first KVK.
Which of the following is not responsible for colour change in fruits during ripening?
A)
Chlorophyll degradation
B)
Breakdown of carbohydrates
C)
Synthesis of carotenoids
D)
Synthesis of anthocyanin
Fruit ripening involves complex biochemical changes that alter the appearance, texture, and taste of the fruit. Colour change is primarily driven by changes in pigments:
1. Chlorophyll degradation (Option a): As fruits ripen, the green chlorophyll is broken down, allowing other colours to become visible or making room for new pigments.
2. Synthesis of carotenoids (Option c): These pigments produce yellow, orange, and red colours (e.g., in mangoes and papayas).
3. Synthesis of anthocyanins (Option d): These water-soluble pigments produce red, purple, and blue colours (e.g., in grapes and blueberries).
In contrast, the breakdown of carbohydrates (Option b)—specifically the conversion of starch into simple sugars like glucose and fructose—is responsible for the change in sweetness and taste, not the change in colour. Therefore, it is not responsible for the colour change during ripening.
Which of the following communication methods is most effective for women farmers in remote villages of Mizoram?
A)
Written reports and pamphlets
B)
Online webinars only
C)
Scientific journals
D)
Audio-visual aids and participatory demonstrations
In the context of agricultural extension, especially for marginalized or remote populations such as women farmers in rural Mizoram, the effectiveness of communication depends on accessibility, literacy levels, and cultural relevance.
1. **Why Option (d) is correct**: Audio-visual aids (videos, posters, radio) and participatory demonstrations (Method Demonstrations or Result Demonstrations) are highly effective because they bypass literacy barriers and provide 'learning by doing.' For women farmers, who may have limited access to formal education or time constraints, seeing a technique applied in their own field (participatory) is the most persuasive and educational method.
2. **Why Option (a) is incorrect**: Written reports and pamphlets require a high level of literacy and can be ignored if the language is too technical or if the farmers cannot read.
3. **Why Option (b) is incorrect**: Online webinars require stable internet connectivity and digital literacy, both of which are often limited in 'remote villages' of hilly terrains like Mizoram.
4. **Why Option (c) is incorrect**: Scientific journals are academic documents intended for researchers and specialists, not for practical application by grassroots farmers.
Which sugar is most commonly added to tissue culture media as a carbon source?
A)
Glucose
B)
Fructose
C)
Sucrose
D)
Lactose
In plant tissue culture, an external carbon source is required because the cultured tissues (explants) are often heterotrophic or mixotrophic and cannot produce sufficient energy through photosynthesis.
1. Why Sucrose is the correct choice: Sucrose is a disaccharide (composed of glucose and fructose) and is the most commonly used carbon source in media like Murashige and Skoog (MS) medium. It is preferred because it is highly soluble, chemically stable, and is the primary form in which sugars are transported in the phloem of higher plants, making it easily metabolized by plant cells.
2. Why other options are incorrect:
- Glucose (a): While glucose is a basic energy source, it is more readily fermented by bacteria and fungi, increasing the risk of contamination. It can also lead to rapid acidification of the medium.
- Fructose (b): Fructose is less stable and less commonly utilized as a primary energy source compared to sucrose in plant systems.
- Lactose (d): Lactose is a milk sugar and is not naturally transported or metabolized efficiently by most plant species, making it unsuitable for general tissue culture.
A cybrid plant is formed when:
A)
Both nucleus and cytoplasm are fused
B)
Two haploid plants fuse naturally
C)
Only cytoplasm from one parent is combined with nucleus of another
D)
Mutation is induced by chemicals
A cybrid (cytoplasmic hybrid) is a plant produced by the fusion of the cytoplasm of one cell with the nucleus of another. This is typically achieved through somatic cell fusion (protoplast fusion) followed by the selective elimination or inactivation of one of the parental nuclei. The resulting plant contains the nuclear genome of one parent and the cytoplasmic organelles (like mitochondria and chloroplasts) of both parents, or specifically the cytoplasm of one parent combined with the nucleus of the other.
Analysis of options:
- Option (a) describes a standard somatic hybrid, where both nuclei and cytoplasms are fused.
- Option (b) describes sexual reproduction or specific breeding, not cybridization.
- Option (c) accurately describes the essence of a cybrid: the combination of a specific nucleus with a specific cytoplasm.
- Option (d) describes mutagenesis, which is a different process from hybridization or cybridization.
The father of modern genetics, Gregor Mendel, worked primarily on:
A)
Rice
B)
Maize
C)
Pea
D)
French Bean
Gregor Mendel, an Austrian monk, is recognized as the father of modern genetics due to his pioneering work on inheritance. Between 1856 and 1863, he conducted extensive hybridization experiments using the garden pea plant (Pisum sativum). He chose the pea plant because it has easily identifiable contrasting traits (e.g., tall vs. short, purple vs. white flowers), a short life cycle, and the ability to be self-pollinated or cross-pollinated. Through these studies, he formulated the fundamental laws of inheritance: the Law of Segregation and the Law of Independent Assortment. Options a (Rice), b (Maize), and d (French Bean) are incorrect because, while they are plants used in later genetic research, they were not the primary subjects of Mendel's foundational experiments.
A piece of potato is placed in a concentrated sugar solution for 30 minutes. After this, the potato becomes flaccid and shrinks. What is the reason?
A)
Water moved into the potato cells by osmosis.
B)
Water moved out of the potato cells by osmosis.
C)
Sugar moved into the potato cells by diffusion.
D)
Sugar moved out of the potato cells by diffusion
This question tests the understanding of osmosis and tonicity in plant cells.
1. **Osmosis Definition**: Osmosis is the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution) across a selectively permeable membrane.
2. **The Scenario**: A potato piece (containing cell sap with a certain concentration of solutes) is placed in a 'concentrated sugar solution'. This means the external environment is **hypertonic** relative to the interior of the potato cells.
3. **Direction of Flow**: Because the sugar solution has a lower water potential than the potato cells, water moves out of the vacuole and cytoplasm of the potato cells into the surrounding solution to reach equilibrium.
4. **Result**: The loss of water leads to a decrease in turgor pressure. The cell membrane pulls away from the cell wall (plasmolysis), causing the potato tissue to become flaccid and shrink in size.
**Why other options are incorrect:**
- **Option a**: Water would only move into the cells if the external solution were hypotonic (e.g., distilled water), which would make the potato turgid, not flaccid.
- **Option c & d**: While diffusion occurs, the primary cause of the rapid shrinking and flaccidity in this biological context is the movement of water (osmosis), not the movement of sugar molecules, which move much more slowly across the cell membrane.
Which nutrient plays a key role in ATP formation and energy transfer in plants?
A)
Nitrogen
B)
Phosphorus
C)
Potassium
D)
Sulphur
Step-by-step reasoning: 1. ATP (Adenosine Triphosphate) is the primary energy currency of the cell. Its chemical structure consists of an adenine base, a ribose sugar, and three phosphate groups. 2. The energy in ATP is stored in the high-energy phosphate bonds; when these bonds are broken (hydrolysis), energy is released for cellular processes. 3. Phosphorus is the essential element that forms these phosphate groups. 4. Analysis of other options: (a) Nitrogen is primarily used in proteins, chlorophyll, and nucleic acids. (c) Potassium acts as an osmoticum and activates enzymes but is not a structural component of ATP. (d) Sulphur is found in certain amino acids (cysteine, methionine) and vitamins, but not in the energy-transfer molecule ATP.
The mechanism responsible for the ascent of sap in plants is:
A)
Root pressure
B)
Capillarity
C)
Cohesion-tension theory
D)
Active transport
The 'ascent of sap' refers to the upward movement of water and dissolved minerals from the roots to the leaves in tall plants.
1. **Cohesion-Tension Theory (Correct):** This is the widely accepted scientific explanation. It posits that transpiration (evaporation of water from leaf stomata) creates a negative pressure (tension) at the top of the xylem. Because water molecules are polar, they stick to each other via hydrogen bonding (cohesion) and to the xylem walls (adhesion). This creates a continuous, unbroken column of water that is 'pulled' upward from the roots to the leaves, regardless of the tree's height.
2. **Root Pressure (Incorrect):** While root pressure helps push water up in small plants or during periods of low transpiration (causing guttation), it is insufficient to move water to the tops of tall trees (e.g., Redwoods).
3. **Capillarity (Incorrect):** Capillary action occurs in very narrow tubes, but the physical limits of capillarity can only lift water a few centimeters or meters, not the dozens of meters required for most trees.
4. **Active Transport (Incorrect):** Active transport requires ATP to move solutes against a concentration gradient. While it is used to load minerals into the xylem, the bulk flow of water itself is a passive process driven by the water potential gradient created by transpiration.
The pedigree method of selection involves:
A)
Selecting plants based on their physical appearance
B)
Keeping detailed records of the ancestry of selected plants
C)
Allowing random mating among plants
D)
Using molecular markers to select plants
The pedigree method is a widely used breeding technique for developing pure lines in self-pollinated crops. In this method, individual plants are selected in the segregating generations (usually starting from F2), and their progeny are grown in separate rows in subsequent generations. The key characteristic of this method is the maintenance of a detailed record (a 'pedigree') of the parent-offspring relationship. This allows the breeder to track the inheritance of desirable traits and discard lineages that show undesirable characteristics.
Why other options are incorrect:
- Option (a): While physical appearance (phenotype) is used to select plants, this is a general feature of most selection methods (like mass selection) and does not define the 'pedigree' aspect specifically.
- Option (c): Random mating is characteristic of population improvement or mass selection, whereas the pedigree method relies on controlled selfing and progeny testing.
- Option (d): Using molecular markers is known as Marker-Assisted Selection (MAS), which is a modern tool that can be used within a pedigree program but is not the definition of the pedigree method itself.
In plant breeding, backcrossing is used to:
A)
Introduce a new trait from a different species
B)
Remove undesirable traits from a variety
C)
Increase the yield potential of a variety
D)
Develop prolific varieties
Backcrossing is a plant breeding method used to transfer a specific desired trait (e.g., disease resistance) from a donor parent into an otherwise high-performing 'recurrent parent' variety. The process involves crossing the hybrid offspring back to the recurrent parent for several generations. This effectively 'washes out' or removes the undesirable traits and genetic baggage introduced by the donor parent, while retaining the specific target gene.
Analysis of other options:
- Option (a) is incorrect because introducing traits from different species usually involves interspecific hybridization or genetic engineering, not standard backcrossing.
- Option (c) is incorrect because while backcrossing can maintain yield, its primary purpose is trait transfer/purification, not the inherent increase of yield potential (which is usually achieved through selection or hybridization).
- Option (d) is incorrect as 'prolific varieties' (high productivity) are generally developed through mass selection, pedigree breeding, or hybrid vigor, rather than the specific mechanism of backcrossing.
The bulk method in plant breeding is primarily used for:
A)
Developing pure lines
B)
Releasing new hybrid varieties
C)
Increasing the frequency of desirable alleles in a population
D)
Producing genetically identical clones
The bulk method (or bulked population method) is a breeding technique used primarily in self-pollinated crops to develop new varieties. In this method, the F2 generation and subsequent generations (up to F5 or F6) are grown and harvested in 'bulk' without individual plant selection. Natural selection acts on the population over several generations, which increases the frequency of desirable alleles that provide a survival or yield advantage in a specific environment.
Why other options are incorrect:
- Option (a): While the bulk method eventually leads to the development of pure lines (after individual plant selection in later generations), its primary mechanism during the bulk phase is the shift in allele frequency via natural selection, not the immediate creation of pure lines.
- Option (b): Hybrid varieties are developed through controlled crossing of distinct inbred lines, not through the bulk method, which relies on selfing and natural selection.
- Option (d): Producing genetically identical clones is achieved through vegetative propagation or tissue culture (asexual reproduction), not through the sexual recombination and selection processes involved in the bulk method.
In plant breeding, the term heterosis refers to:
A)
Hybrid vigour leading to superior performance
B)
The process of self-pollination
C)
Genetic uniformity in a population
D)
The ability of a plant to adapt to various environmental conditions
Step-by-step reasoning: 1. Definition: Heterosis, commonly known as 'hybrid vigour', is the phenomenon where the progeny (F1 hybrid) of two genetically diverse parents exhibits superior traits (such as higher yield, faster growth, or better stress resistance) compared to both parents. 2. Mechanism: It is generally attributed to the masking of harmful recessive alleles (dominance hypothesis) or the synergistic effect of heterozygous gene combinations (overdominance hypothesis). 3. Evaluating options: Option (a) directly describes this phenomenon. Option (b) refers to autogamy, which often leads to inbreeding depression (the opposite of heterosis). Option (c) refers to homozygosity or genetic homogeneity, which is the goal of pure-line breeding, not heterosis. Option (d) refers to phenotypic plasticity or general adaptability, which is a different trait from the genetic superiority gained through hybridization.
Which of the following is a non-climacteric fruit?
A)
Mango
B)
Banana
C)
Pineapple
D)
Papaya
In post-harvest technology, fruits are classified into two categories based on their ripening patterns: climacteric and non-climacteric.
1. Climacteric fruits: These fruits exhibit a burst of ethylene production and a sharp increase in respiration rate during ripening. They can be harvested while mature but unripe and will continue to ripen off the plant. Examples include Mango, Banana, Papaya, Apple, and Tomato.
2. Non-climacteric fruits: These fruits do not show a significant increase in ethylene production or respiration rate after harvest. They must ripen fully on the plant to achieve maximum quality and sweetness, as they cannot ripen further once detached. Examples include Pineapple, Citrus fruits, Grapes, and Strawberries.
Analyzing the options:
- Mango (a): Climacteric
- Banana (b): Climacteric
- Pineapple (c): Non-climacteric
- Papaya (d): Climacteric
Therefore, Pineapple is the correct answer.
Which of the following is a common method for controlling post-harvest diseases in fruits?
A)
Hot water treatment
B)
Waxing
C)
Shrink wrapping
D)
Precooling
Step-by-step reasoning:
1. **Hot Water Treatment (HWT)**: This is a widely recognized physical method used to control post-harvest diseases and pests (such as fruit flies and fungal pathogens like anthracnose). By immersing fruits in water at a specific temperature for a set duration, the heat kills or inhibits the growth of pathogens on the surface and sometimes within the skin of the fruit without damaging the tissue.
2. **Waxing (Option b)**: While waxing helps reduce moisture loss (transpiration) and improves the appearance of the fruit, its primary purpose is to extend shelf life by reducing water loss, not specifically to control diseases (though some waxes may contain fungicides).
3. **Shrink wrapping (Option c)**: This is a packaging technique used for protection, branding, and preventing physical damage or contamination during transport; it is not a method for controlling biological diseases.
4. **Precooling (Option d)**: Precooling is the rapid removal of field heat immediately after harvest. While it slows down the metabolic rate and the growth of pathogens (extending shelf life), it is a preservation technique rather than a specific 'control method' for eliminating existing diseases like HWT is.
In the context of NE India, Participatory Rural Appraisal (PRA) is particularly important because:
A)
Farmers prefer government-centric planning
B)
The region has diverse tribal knowledge and agro-ecological conditions
C)
Technology adoption is uniform across the region
D)
There is no need for local participation
Participatory Rural Appraisal (PRA) is a set of approaches and methods used to enable local people to share, enhance, and analyze their knowledge of their own life and conditions. In the context of North East (NE) India, PRA is critical for the following reasons: 1. Diversity: The region is characterized by a vast array of ethnic groups, each possessing unique indigenous technical knowledge (ITK) regarding farming and forest management. 2. Agro-ecological Variation: The terrain varies from plains to high mountains with diverse micro-climates, meaning a 'one-size-fits-all' government approach often fails. 3. Bottom-up Planning: PRA allows extension workers to integrate this local wisdom into scientific planning, ensuring that agricultural interventions are culturally acceptable and ecologically sustainable.
Why other options are incorrect:
- Option (a) is incorrect because PRA is designed specifically to move away from 'government-centric' (top-down) planning toward 'community-centric' (bottom-up) planning.
- Option (c) is incorrect because technology adoption is highly non-uniform due to differences in literacy, infrastructure, and traditional beliefs across different tribes and states.
- Option (d) is incorrect because local participation is the fundamental core of PRA; without it, the methodology does not exist.
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