MCAER PG CET 2026 AGRONOMY

 

MCAER PG CET 2026

AGRONOMY SPECIALIST QUIZ

Time Left: 100s

1. The 'Law of Optimality' in Agronomy suggests that the efficiency of an input is highest when:

All other factors are at their minimum All other factors are at their optimum level Only the specific factor is applied in excess The crop is at physiological maturity

Answer: B. Based on Liebscher’s Law, the response to a production factor is maximized when other factors are in optimal supply.

2. (PYQ 2022) Which formula is used to calculate the 'Harvest Index' (HI) of a crop?

(Biological Yield / Economic Yield) × 100 (Economic Yield / Biological Yield) × 100 (Total Biomass - Root weight) / Area Economic Yield + Biological Yield

Answer: B. HI = (Economic Yield / Biological Yield) × 100. It represents the efficiency of dry matter partitioning.

3. In the 'Penman-Monteith' equation, which parameter is considered the most critical for estimating Evapotranspiration?

Soil color Aerodynamic and surface resistance Plant height only Rooting depth

Answer: B. PM equation is physically based and accounts for both net radiation and aerodynamic/surface resistance.

4. Which of the following herbicides acts by inhibiting the 'Acetolactate Synthase' (ALS) enzyme?

Atrazine Sulfosulfuron Paraquat Glyphosate

Answer: B. Sulfonylureas like Sulfosulfuron inhibit the ALS enzyme, which is essential for amino acid synthesis.

5. (PYQ 2024) The 'Consumptive Use' of water by a crop is the sum of:

Transpiration + Evaporation + Water used for metabolic activities Runoff + Percolation Seepage + Drainage Rainfall + Irrigation

Answer: A. Consumptive use (CU) = ET + water used in plant metabolism (usually less than 1%).

6. The 'Thermal Unit Requirement' (Growing Degree Days) for a crop with Base Temperature 10°C, where Tmax is 30°C and Tmin is 20°C, for one day is:

5 GDD 15 GDD 25 GDD 10 GDD

Answer: B. GDD = [(Tmax + Tmin)/2] - Tbase. So, [(30+20)/2] - 10 = 25 - 10 = 15.

7. 'Relay Cropping' is also known as:

Sequential cropping Paira/Utera cropping Alley cropping Ratoon cropping

Answer: B. Relay cropping involves sowing the second crop before the harvest of the first, commonly called Paira in Bihar/WB and Utera in MP.

8. If the Land Equivalent Ratio (LER) is 1.4, it indicates:

40% yield advantage over sole cropping 1.4% yield disadvantage 140% yield advantage Neutral effect of intercropping

Answer: A. LER > 1 indicates advantage. 1.4 means 40% more area would be needed in sole cropping to produce the same yield.

9. Which soil moisture constant is associated with a tension of -0.33 bar (or -33 kPa)?

Wilting Point Field Capacity Hygroscopic Coefficient Saturation capacity

Answer: B. Field capacity in most soils is held at 1/3 bar tension.

10. The concept of 'Functional Nutrient' was given by:

Arnon and Stout D.J. Nicholas Liebig Blackman

Answer: B. Nicholas (1963) proposed 'Functional Nutrients' to include elements like Na, Si, Co, and V which are not essential for all but beneficial.

Review the correct answers and explanations above.