MCAER PG CET 2026 AGRONOMY

 

Agronomy PG CET 2026

Time Remaining: 100s

1. According to the concept of 'Relative Growth Rate' (RGR), if the initial weight is $W_1$ and final weight is $W_2$ over time $T_2 - T_1$, the formula is expressed as:

• (log $W_2$ - log $W_1$) / ($T_2 - T_1$)
• ($W_2 - W_1$) / ($T_2 - T_1$)
• ($W_2 - W_1$) / $W_1$
• (ln $W_2$ - ln $W_1$) / ($T_2 - T_1$)

Correct: D. RGR uses natural logarithms (ln) to express the increase in dry weight per unit of original weight per unit of time.

2. Which among the following indices is used to measure the competition between intercrop and base crop? PYQ 2021

• LER (Land Equivalent Ratio)
• Cey (Competition Index)
• Aggressivity
• Harvest Index

Correct: C. Aggressivity gives a simple measure of how much the relative yield increase in one crop is greater than that of the other.

3. In the context of herbicide resistance, the "point mutation" in the D1 protein of photosystem II is primarily responsible for resistance against:

• Glyphosate
• Atrazine
• Paraquat
• 2,4-D

Correct: B. Triazine resistance (like Atrazine) occurs due to a change in the psbA gene which encodes the D1 protein.

4. The "Thermal Use Efficiency" (TUE) in crops is defined as the ratio of:

• Yield / Total GDD
• Yield / Transpiration
• Biomass / Net Radiation
• Heat Units / Water Used

Correct: A. TUE measures how efficiently the crop converts accumulated heat units (Growing Degree Days) into economic yield.

5. Under the 'Law of Minimum' proposed by Liebig, the crop yield is proportional to:

• The most abundant nutrient
• The amount of the most limiting nutrient
• Sum of all nutrients
• Average of available nutrients

Correct: B. It states that growth is dictated by the scarcest resource (limiting factor), not total resources available.

6. A soil with a 'Bulk Density' of 1.4 g/cc and 'Particle Density' of 2.65 g/cc has a porosity of approximately: PYQ 2023

• 35%
• 47%
• 53%
• 60%

Correct: B. Porosity % = $[1 - (BD/PD)] \times 100$. $[1 - (1.4/2.65)] \times 100 = 47.16\%$.

7. The 'Triple Gene Dwarf' wheat varieties were developed using which specific dwarfing gene source?

• Dee-geo-woo-gen
• Norin-10
• Tift 23A
• Opaque-2

Correct: B. Norin-10 from Japan provided the Rht1 and Rht2 genes that revolutionized wheat production.

8. What is the 'Critical Period of Weed Competition' in most upland Direct Seeded Rice (DSR)?

• 0-15 DAS
• 15-45 DAS
• 45-60 DAS
• Throughout the season

Correct: B. For DSR, the first 15-45 days are most critical as weeds grow faster than rice seedlings in non-flooded conditions.

9. Which tillage system leaves at least 30% of the soil surface covered by residues?

• Conventional Tillage
• Intensive Tillage
• Conservation Tillage
• Zero Tillage only

Correct: C. Conservation tillage is defined by the 30% residue cover threshold to reduce erosion.

10. 'Hidden Hunger' in plants refers to:

• Nutrient deficiency with visible symptoms
• Nutrient toxicity
• Nutrient deficiency without visible symptoms
• Excess water consumption

Correct: C. Plants may suffer from nutrient shortage that reduces yield before any visual deficiency symptoms appear.

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