Agriculture

Step 1: Understanding windmill operation.
Windmills require a minimum wind speed (called cut-in speed) to start functioning and generating power.
Step 2: Ideal range for operation.
For most traditional windmills and small turbines, the cut-in speed is about 10–15 km/hr, but the efficient operational range is around 20–25 km/hr.
Below this, power generation is negligible, and above very high speeds, safety mechanisms stop the blades.
Step 3: Analysis of options.
- (1) 40–45 km/hr: Too high, usually unsafe for continuous operation.
- (2) 30–35 km/hr: High, but not the standard required speed range.
- (3) 20–25 km/hr: Correct, this is the typical operating range.
- (4) 10–15 km/hr: This is the starting speed, not the efficient operating speed.
Step 4: Conclusion.
Thus, the operational wind speed for windmills is 20–25 km/hr.

Step 1: Background.
NAREGA was launched by the Government of India in 2005 as a major social security scheme.
It was later renamed as the Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) in 2009.
Step 2: Objective of NAREGA.
The act provides at least 100 days of guaranteed wage employment per year to every rural household whose members volunteer to do unskilled manual work.
It aims at improving livelihood security in rural areas.
Step 3: Checking options.
- (1) National Rural Employment Guarantee Act: Correct, official name.
- (2) National Regional Employment Generation Act: Wrong, no such act exists.
- (3) National Regional Employment Guarantee Act: Wrong, incorrect wording.
- (4) National Rural Employment Generation Act: Wrong, incorrect wording.
Step 4: Conclusion.
Thus, NAREGA referred to the National Rural Employment Guarantee Act.

Step 1: Identification.
Thompson Seedless is one of the most popular white seedless grape varieties used both for table and raisin production.
Step 2: Analysis of options.
- (1) Anab-e-Shahi: A seeded grape variety, not white seedless.
- (2) Thompson seedless: Correct, a white seedless grape variety.
- (3) Sharad seedless: Black seedless grape variety.
- (4) Saritha seedless: Coloured seedless grape, not white.
Step 3: Conclusion.
Thus, the correct answer is Thompson seedless.

Step 1: Radish varieties.
Pusa Chetki is a famous early maturing radish variety developed by IARI, hence A → III.
Step 2: Brinjal varieties.
Pusa Purple Long is a widely cultivated brinjal variety, hence B → I.
Step 3: Tomato varieties.
Pusa Ruby is a popular tomato variety, hence C → II.
Step 4: Pea varieties.
Pusa Pragati is an improved variety of pea, hence D → IV.
Step 5: Conclusion.
Thus, the correct matching is A - III, B - I, C - II, D - IV.

Step 1: About ICAR-CISH.
The ICAR-Central Institute of Subtropical Horticulture (CISH) was established to conduct advanced research in subtropical fruits.
It mainly focuses on crops like mango, guava, papaya, litchi, aonla, and other subtropical horticultural crops.
Step 2: Location.
ICAR-CISH is located in **Lucknow, Uttar Pradesh**.
It has two campuses – one at Rehmankhera and another at Malihabad.
Step 3: Analysis of options.
- (1) Srinagar: Known for temperate horticulture institutes, not subtropical.
- (2) Bikaner: Arid zone research institutes are located here.
- (3) Ludhiana: Focuses on agricultural research in Punjab, not subtropical fruits.
- (4) Lucknow: Correct, the main center for subtropical horticulture research.
Step 4: Conclusion.
Thus, ICAR-CISH is located at **Lucknow**.

Step 1: Concept of price discrimination.
Price discrimination means charging different prices to different consumers for the same product, even though the cost of production is the same.
Step 2: Market condition for price discrimination.
This is possible only when the seller has full control over supply and no close substitutes are available.
Hence, price discrimination is most feasible in a monopoly market structure.
Step 3: Analysis of options.
- (1) Oligopoly: Some price control exists, but price discrimination is not the common practice here.
- (2) Perfect Competition: Not possible, as many sellers exist and products are homogeneous.
- (3) Monopoly: Correct, as the monopolist enjoys price-making power.
- (4) Duopoly: Only two sellers, but not typical for strong price discrimination.
Step 4: Conclusion.
Thus, price discrimination is a common practice in Monopoly.

Step 1: Role of rootstocks.
Rootstocks are used in fruit crops like apple to control tree vigor, size, yield, and adaptability.
Dwarfing rootstocks reduce plant size, making orchards easier to manage and more productive.
Step 2: Apple rootstock classification.
- Semi-vigorous rootstocks: M 109, M 12.
- Semi-dwarfing rootstock: M 26.
- Very dwarfing rootstock: M 27, produces the smallest trees, ideal for high-density planting.
Step 3: Analysis of options.
- (1) M 12: Semi-vigorous, not dwarfing.
- (2) M 109: Vigorous type, not dwarfing.
- (3) M 26: Semi-dwarf, not the smallest.
- (4) M 27: Correct, very dwarfing rootstock for apple.
Step 4: Conclusion.
Hence, M 27 is the very dwarfing rootstock of apple.

Step 1: Farm holding classification in India.
- Marginal: Less than 1 hectare.
- Small: 1–2 hectares.
- Semi Medium: 2–4 hectares.
- Medium: 4–10 hectares.
- Large: Above 10 hectares.
Step 2: Ascending order.
From smallest to largest: Marginal Step 3: Matching with given letters.
- B = Marginal (smallest).
- C = Semi Medium (next).
- D = Medium (larger).
- A = Large (largest).
Step 4: Correct sequence.
Therefore, the correct order is B, C, D, A.

Step 1: About Woolly aphid.
The woolly aphid (Eriosoma lanigerum) is a major pest that attacks apple orchards worldwide.
It covers plant parts with white wool-like waxy secretions, hence the name "woolly aphid".
Step 2: Damage symptoms.
- Infests roots, stems, and branches of apple trees.
- Causes swelling, gall formation, and cracks on the bark.
- Reduces tree vigor, fruit yield, and quality.
Step 3: Analysis of options.
- (1) Mango: Attacked mainly by hoppers and mealybugs, not woolly aphid.
- (2) Apple: Correct, woolly aphid is a serious pest of apple.
- (3) Ber: Attacked by fruit flies, not woolly aphid.
- (4) Guava: Attacked by fruit fly, mealybug, wilt diseases, not woolly aphid.
Step 4: Conclusion.
Hence, woolly aphid is associated with apple fruit.

Step 1: Nitrogen fixation overview.
Nitrogen fixation can be symbiotic (e.g., Rhizobium in legumes) or non-symbiotic (free-living organisms).
It can also be autotrophic (algae, cyanobacteria) or heterotrophic (bacteria like Azotobacter).
Step 2: Aerobic vs anaerobic fixers.
- Aerobic non-symbiotic fixers: Azotobacter.
- Anaerobic non-symbiotic fixers: Clostridium.
- Autotrophic fixers: Blue Green Algae, Nostoc.
Step 3: Analysis of options.
- (A) Blue Green Algae: Autotrophic nitrogen fixers, not heterotrophic.
- (B) Nostoc: Symbiotic cyanobacterium, autotrophic.
- (C) Clostridium: Heterotrophic but anaerobic, not aerobic.
- (D) Azotobacter: Correct, heterotrophic, aerobic, free-living nitrogen fixer.
Step 4: Conclusion.
Thus, Azotobacter is the correct answer.

Step 1: Understanding seed rate.
Seed rate is the amount of seed required per unit area for optimum plant population.
It depends on sowing time, method of sowing, and seed size.
Step 2: Normal vs late sowing.
- For timely sown wheat (in November), the recommended seed rate is around 100--125 kg/ha.
- For late sown wheat (December onwards), the crop duration is shorter, and plant tillering is poor due to low temperature.
- To compensate for poor tillering, higher seed rate is required.
Step 3: Analysis of options.
- (A) 75--100 kg/ha: Too low, suitable only for irrigated timely sown wheat.
- (B) 100--105 kg/ha: This is for normal sowing, not late sowing.
- (C) 125--150 kg/ha: Slightly higher but still insufficient for late sowing.
- (D) 150--180 kg/ha: Correct, as late sown wheat needs more seeds to achieve optimum plant stand.
Step 4: Conclusion.
Thus, the recommended seed rate for late sown wheat is 150--180 kg/ha.

Step 1: Definition of Agronomy.
Agronomy is a branch of agricultural science that deals with crop production, soil management, and farming practices.
It combines various aspects of biology, chemistry, and environmental science to increase agricultural productivity.
Step 2: Contribution of Jethro Tull.
Jethro Tull is regarded as the father of Agronomy because he introduced scientific methods of farming.
He invented the seed drill in the 18th century, which allowed seeds to be sown in rows at proper depth and spacing.
This invention drastically improved crop germination and yield compared to traditional broadcasting.
He also emphasized the importance of tillage and soil management in crop production.
Step 3: Analysis of options.
- (A) Jethro Tull: Correct answer, father of Agronomy due to his contributions in modern farming techniques.
- (B) J.V. Liebig: Known as the father of Agricultural Chemistry for his work on plant nutrition and mineral theory.
- (C) Peter Discresezni: Not related to Agronomy significantly.
- (D) Molisch: Known for work in plant physiology, not Agronomy.
Step 4: Conclusion.
Hence, Jethro Tull is rightly considered the father of Agronomy.

Step 1: Understanding herbicide classification.
Herbicides are broadly classified into pre-emergence and post-emergence herbicides.
Pre-emergence herbicides are applied before weed seeds germinate, whereas post-emergence herbicides are applied after weed emergence.
Step 2: Herbicides in rice crop.
- In rice, weed control is very important during the early stages to reduce crop-weed competition.
- Post-emergence herbicides are widely used because they target weeds after they have already emerged, ensuring effective control.
Step 3: Analysis of options.
- (A) Pendimethalin: This is a pre-emergence herbicide, not a post-emergence one.
- (B) Atrazine: Used mainly in maize as a pre-emergence herbicide, not suitable for rice.
- (C) Bispyribac sodium: This is a selective post-emergence herbicide, highly effective for controlling grasses, sedges, and broad-leaved weeds in transplanted rice.
- (D) Pyroxasulfone: Mostly used as a pre-emergence herbicide in other crops, not as a post-emergence in rice.
Step 4: Conclusion.
Hence, the correct post-emergence herbicide used for controlling weeds in rice crop is Bispyribac sodium.

Step 1: Types of herbicides.
Herbicides can be classified as:
- Selective herbicides: Kill specific weeds without harming the crop.
- Non-selective herbicides: Kill all types of plants they come into contact with.
Additionally, they may act as contact (killing only the part they touch) or systemic (moving through the plant system).
Step 2: About Paraquat.
Paraquat is a non-selective, contact herbicide.
It kills green plant tissue immediately upon contact by destroying cell membranes.
It does not move systemically in the plant, so underground parts may survive if not sprayed.
It is widely used for weed control in non-crop areas and as a desiccant before harvest.
Step 3: Analysis of options.
- (A) Paraquat: Correct, non-selective contact herbicide.
- (B) Glyphosate: Non-selective, but systemic, not contact.
- (C) Metribuzin: Selective, systemic herbicide, not purely contact.
- (D) Isoproturon: Selective herbicide, used for broadleaf weeds in wheat.
Step 4: Conclusion.
Thus, Paraquat is the correct non-selective contact herbicide.

Step 1: Imazethapyr.
Imazethapyr is an ALS (Acetolactate Synthase) inhibitor herbicide, disrupting branched-chain amino acid synthesis. Hence A → II.
Step 2: Glyphosate.
Glyphosate inhibits EPSP synthase (5-enolpyruvylshikimate-3-phosphate synthase), blocking aromatic amino acid synthesis. Hence B → III.
Step 3: Clodinafop-propargyl.
This herbicide inhibits Acetyl-CoA carboxylase (ACCase), preventing lipid biosynthesis. Hence C → IV.
Step 4: Atrazine.
Atrazine is a photosystem II inhibitor, interfering with electron transport in photosynthesis. Hence D → I.
Step 5: Conclusion.
The correct matching is A - II, B - III, C - IV, D - I.

Step 1: Understanding the concept.
Unemployment occurs when people willing to work cannot find jobs.
When employment depends on seasonal demand and workers are unemployed in off-season, it is termed as seasonal unemployment.
Step 2: Example.
Agriculture, sugar industry, and other crop-based industries are prone to seasonal unemployment.
For instance, farm workers may not find jobs outside the sowing and harvesting season.
Step 3: Analysis of options.
- (1) Cyclical Unemployment: Due to business cycle recessions, not season-based.
- (2) Technological Employment: Incorrect option, as unemployment can occur due to new technology replacing workers.
- (3) Frictional Unemployment: Due to time gap when workers change jobs.
- (4) Seasonal Unemployment: Correct, caused by season-bound work.
Step 4: Conclusion.
Thus, season-bound unemployment is called Seasonal Unemployment.

Step 1: Understanding Berlo’s model.
Berlo's SMCR model (Source-Message-Channel-Receiver) is a simple yet powerful framework for communication.
It explains how communication begins with a source, creates a message, uses a channel, and ends with a receiver.
Step 2: Correct sequence.
- First: The Source originates the communication.
- Second: The Message is created and encoded.
- Third: The Channel is the medium through which the message is transmitted.
- Fourth: The Receiver decodes and interprets the message.
Step 3: Mapping with given letters.
D = Source, C = Message, B = Channel, A = Receiver.
So the correct sequence is D → C → B → A.
Step 4: Conclusion.
Thus, according to Berlo’s model, the order is Source → Message → Channel → Receiver.

Step 1: Concept of diffusion of innovation.
According to Everett Rogers' theory of diffusion of innovation, society adopts new ideas and technologies in distinct categories: Innovators, Early Adopters, Early Majority, Late Majority, and Laggards.
Step 2: Role of Innovators.
Innovators are the very first group of people who adopt a new idea, method, or technology.
They are venturesome, willing to take risks, and often test ideas before others.
They usually form about 2.5% of the total population in adoption studies.
Step 3: Analysis of options.
- (1) Early Adopters: They follow innovators, but they are slightly more cautious and not as risk-taking.
- (2) Early Majority: They adopt after seeing success from innovators and early adopters.
- (3) Innovators: Correct, they adopt new ideas first and take risks.
- (4) Late Majority: Conservative group, adopts very late.
Step 4: Conclusion.
Hence, the people oriented towards taking risks and adopting a new idea first are called Innovators.

Step 1: Background.
Aristotle, the Greek philosopher, developed one of the earliest models of communication.
He emphasized persuasion and public speaking.
Step 2: Elements of the model.
According to Aristotle, communication consists of:
- The Speaker who delivers the message.
- The Speech (or message) being communicated.
- The Audience who receives and interprets the speech.
Step 3: Elimination of wrong element.
Channel is not explicitly included in Aristotle’s model.
Hence, C (Channel) is not a part of the three core elements.
Step 4: Conclusion.
Thus, the three elements of Aristotle’s model are Speaker, Speech, and Audience.