GATE AG 2011 • Q4 MCQ • 1 Mark

Section 2: Farm Machinery

Farm Machinery

Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing

Question Statement:

A maize planter drops seeds at 0.20 m interval. The seed weight is 200 g per 1000 seeds. If the row to row spacing is 0.25 m, the seed rate in kg ha⁻¹ is

Options:

  • (A) 5
  • (B) 10
  • (C) 20
  • (D) 40

Official Answer Key:

D

Step-by-Step Solution & Explanation

Area occupied per seed = seed spacing × row spacing = 0.20 m × 0.25 m = 0.05 m². Number of seeds per hectare = 10,000 m²/ha ÷ 0.05 m²/seed = 200,000 seeds/ha. Weight per seed = 200 g/1000 seeds = 0.2 g/seed. Seed rate = 200,000 × 0.2 g = 40,000 g/ha = 40 kg/ha, matching option (D). A common error (option B, 10) comes from inverting row and seed spacing or mixing up g/kg conversion.

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