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All Free Agriculture MCQs with Answers

Every Agriculture question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.

2,315 questions · page 13 of 116

241. All harvested crops remove plant nutrients from the soil. Whether used for _______________; the various crop products are often consumed far away from the production sites, some times thousands of kilometers away in another country.

  • A. All of these
  • B. Feed
  • C. industrial raw materials
  • D. Food

Explanation: Harvested crops remove nutrients whether their products are eaten as food, fed to animals, or processed as industrial raw materials.

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Correct answer: All of these

242. Element responsible pollen grain of plant__________?

  • A. N
  • B. B
  • C. K
  • D. P

Explanation: Boron is especially important for pollen germination and pollen-tube growth, so deficiency often causes poor fertilization and fruit or…

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Correct answer: B

243. BGA was discovered as a nitrogen fixer in paddy field by ?

  • A. Beijerinck
  • B. Fred
  • C. P.K dey
  • D. None of the above

Explanation: P. K. Dey is credited in agricultural literature with reporting nitrogen fixation by blue-green algae in paddy fields.

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Correct answer: P.K dey

244. Which element is known as chemical police man of plant?

  • A. Potassium
  • B. Phosphorus
  • C. Magnesium
  • D. All of the above

Explanation: Potassium is called the chemical policeman of plants because it regulates enzyme activity, water balance, stomatal movement and several…

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Correct answer: Potassium

245. Which of the following nutrient elements are regarded as energy exchangers:

  • A. Hydrogen
  • B. Both A & B
  • C. Oxygen
  • D. None of these

Explanation: Hydrogen and oxygen participate in oxidation-reduction reactions and energy transformations in plant metabolism, so they are described as…

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Correct answer: Both A & B

246. Conservation agriculture improves the water use efficiency of dryland systems. It has components:

  • A. Reduced soil disturbance through no-till or minimum till
  • B. Residue return to keep at least 30% of soil covered
  • C. all of the above
  • D. Crop rotations for better utilization of available water & nutrients

Explanation: Conservation agriculture combines minimum soil disturbance, residue cover of about 30% or more, and crop diversification or rotation.

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Correct answer: all of the above

247. Water is the major constituent of all living creatures. Biomass of plants is composed of ________% water:

  • A. 65 - 75%
  • B. 72 - 62%
  • C. 75% - 80%
  • D. 85 - 95%

Explanation: Fresh plant material commonly contains roughly 85 to 95% water, while only a small fraction is dry matter.

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Correct answer: 85 - 95%

248. In Pakistan there is general deficiency of rainfall. It varies from 125 mm annually in upper Sindh to about 900 mm in the sub-mountainous of northern Pakistan. In Balochistan the mean annual rainfall is about 200 mm, diminishing to ________ mm in the desert of Kharan:

  • A. 100 mm
  • B. <50 mm
  • C. >70 mm
  • D. None of these

Explanation: Kharan lies in the arid desert region of Balochistan, where annual rainfall can fall below 50 mm.

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Correct answer: <50 mm

249. In Pakistan, Nitrophos is manufactured in_________?

  • A. Lasbella
  • B. Sawat
  • C. Multan
  • D. Shikarpoor

Explanation: In Pakistan, nitrophos fertilizer is manufactured at the Pak-Arab Fertilizer complex in Multan.

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Correct answer: Multan

250. All the SSP and some nitrophos are are manufactured locally by the National Fertilizer Corporation (NFC): SSP at_________?

  • A. Faisalabad
  • B. Jaranwala
  • C. Haripur
  • D. All of these

Explanation: National Fertilizer Corporation plants associated with locally manufactured single superphosphate include facilities at Faisalabad…

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Correct answer: All of these

251. In Pakistan, the major phosphatic fertilizers are:

  • A. All of Above
  • B. SSP
  • C. Nitrophos
  • D. DAP

Explanation: DAP, SSP and nitrophos are all commercially important phosphatic fertilizers used in Pakistan.

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Correct answer: All of Above

252. The appropriate method to apply phosphatic fertilizers is__________?

  • A. Top dressing
  • B. Broad casting
  • C. Basal placement
  • D. both A and B

Explanation: Phosphorus moves very little in soil, so phosphatic fertilizer is best applied as a basal dose near or below the seed before or at sowing.

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Correct answer: Basal placement

253. Integrated Nutrient Management (INM) is a well-accepted approach for the sustainable management of________?

  • A. Soil Productivity
  • B. Increased crop production
  • C. both a and B
  • D. None of theseFind Geological Maps

Explanation: INM combines mineral fertilizers with organic manures, crop residues and biofertilizers to maintain soil productivity while supporting…

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Correct answer: both a and B

254. Exposure of the manures to rains causes highest loss of___________?

  • A. P
  • B. Cu
  • C. Cl
  • D. N

Explanation: Rain leaches and washes soluble nitrogen compounds from exposed manure, making nitrogen the nutrient most readily lost.

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Correct answer: N

255. The instrument used for measuring the photosynthetically active radiations (PAR) is:________?

  • A. Quantom sensor
  • B. Pyrgeometer
  • C. Pyrheliometer
  • D. Both A & C

Explanation: A quantum sensor measures photosynthetically active radiation, usually expressed as photosynthetic photon flux in the 400–700 nm range.

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Correct answer: Quantom sensor

256. Most out standing green manure crop is__________?

  • A. Sun hemp
  • B. Dhaincha
  • C. Both of the above
  • D. None of the above

Explanation: Dhaincha is widely regarded as an outstanding green-manure crop because it produces abundant biomass and fixes atmospheric nitrogen…

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Correct answer: Dhaincha

257. Which of the following crop takes N in ammonical form:

  • A. Wheat
  • B. Cotton
  • C. Mustard
  • D. Rice

Explanation: Rice prefers and efficiently absorbs nitrogen in ammonium form because flooded soils become reducing and favour ammonium over nitrate.

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Correct answer: Rice

258. If the chlorophyll content in plant increases, the solar radiation transmitted:

  • A. Decreases
  • B. Increases
  • C. Constant
  • D. None of theseAccess Government Careers

Explanation: More chlorophyll means greater absorption of incoming solar radiation for photosynthesis, so less radiation passes through or is…

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Correct answer: Decreases

259. The nutrient element silicon (Si) is:_________?

  • A. Harmful
  • B. Beneficial
  • C. Both a and b
  • D. None of the above

Explanation: Silicon is a beneficial, rather than generally essential, element for most higher plants, and it can improve resistance to pests…

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Correct answer: Beneficial

260. Most abundant organic compound in nature?

  • A. All of these
  • B. Hemicellulose
  • C. Lignin
  • D. Cellulose

Explanation: Cellulose is the most abundant organic compound in nature because it forms the structural cell walls of plants and is produced in enormous…

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Correct answer: Cellulose
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