RPSC Assistant Agriculture Officer (Rajasthan) 2021 screening

India · Rajasthan Public Service Commission · civil-service

124practice questions written to this syllabus
1subjects

Format

150 questions / 150 marks, 2.5 hours, bilingual, -1/3 negative.

Sections

Official source: https://rpsc.rajasthan.gov.in/Static/Syllabus/0E2B9906-790D-454F-95BE-37EA26644F2E.pdf

Subjects this exam draws on

Agriculture & Food Systems (bridge)124 questions

Five practice questions, worked

Original questions written to this exam's published syllabus and pattern. Not past papers.

1. The botanical name of pigeonpea (red gram) is

  1. Cajanus cajan
  2. Cicer arietinum
  3. Vigna radiata
  4. Arachis hypogaea
Answer and working

A. Cajanus cajan

Pigeonpea is Cajanus cajan. Cicer arietinum is chickpea, Arachis hypogaea is groundnut and Vigna radiata is green gram (mung bean).

Agriculture & Food Systems (bridge) · Major crops: rice, wheat, chickpea, pigeonpea, sugarcane, groundnut, tomato, mango

2. IR8, released by the International Rice Research Institute in 1966, is remembered because it

  1. was the first hybrid rice, bred using cytoplasmic male sterility in China
  2. was the semi-dwarf rice that launched the Green Revolution in rice
  3. was the first aromatic basmati bred for Middle East exports
  4. was the first genetically engineered rice with beta-carotene
Answer and working

B. was the semi-dwarf rice that launched the Green Revolution in rice

IR8 was a high-yielding semi-dwarf variety that responded to fertiliser without lodging and spread rapidly across Asia. Hybrid rice was developed in China in the 1970s, and beta-carotene 'golden rice' is a much later transgenic development.

Agriculture & Food Systems (bridge) · Major crops: rice, wheat, chickpea, pigeonpea, sugarcane, groundnut, tomato, mango

3. Long-duration pigeonpea is commonly intercropped with sorghum or pearl millet mainly because

  1. both crops root to the same shallow depth, so they share topsoil moisture
  2. the cereal shades the pigeonpea and so keeps the pod borer from laying any eggs on it
  3. pigeonpea grows slowly early on, so the cereal matures before competition peaks
  4. pigeonpea cannot form root nodules unless a cereal is grown alongside it
Answer and working

C. pigeonpea grows slowly early on, so the cereal matures before competition peaks

Pigeonpea's slow early growth and long duration leave space and time for a faster cereal, which is harvested before the pigeonpea canopy closes; the deep-rooted legume then uses deeper moisture. Nodulation does not need a companion crop, and shared shallow rooting would increase competition, not reduce it.

Agriculture & Food Systems (bridge) · Major crops: rice, wheat, chickpea, pigeonpea, sugarcane, groundnut, tomato, mango

4. How much urea (46% N) is needed to supply 120 kg of nitrogen per hectare?

  1. About 261 kg
  2. About 120 kg
  3. About 55 kg
  4. About 552 kg
Answer and working

A. About 261 kg

Product = nutrient / fraction = 120 / 0.46 = 260.9 kg. Multiplying 120 by 0.46 gives 55 kg, the most common slip; 552 kg multiplies 120 by 4.6, a decimal slip in the grade (dividing by 0.46 twice would give about 567 kg).

Agriculture & Food Systems (bridge) · Soils and NPK deficiency symptoms

5. Fertiliser costing 8,000 per hectare raises wheat yield by 1,200 kg/ha, and wheat sells at 20 per kg. What is the value-cost ratio of the fertiliser?

  1. 2.0
  2. 150
  3. 0.33
  4. 3.0
Answer and working

D. 3.0

Value of extra output = 1,200 x 20 = 24,000. VCR = 24,000 / 8,000 = 3.0. 2.0 is the net return per unit cost ((24,000 - 8,000) / 8,000), a different measure; 0.33 inverts the ratio; 150 divides kilograms by thousands of currency.

Agriculture & Food Systems (bridge) · Soils and NPK deficiency symptoms

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