For annual horticultural crops (vegetables like tomato, chilli, capsicum, melons, and strawberries), the standard desirable film thickness is $20 - 25\text{ microns}$ (range $10 - 25\text{ microns}$ / 100 gauge).
This gauge ensures an optimal compromise between mechanical tear resistance, soil moisture conservation, weed suppression, and cost-effectiveness.
Thicker films ($50 - 100\text{ microns}$) are reserved for perennial orchard mulching or solarization.
Correct Option: Option 3 (10-25 micron).
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2
ICAR JRF Vegetable Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What could be the size of a single-pan structure of green house?
In protected horticulture and Government scheme guidelines (MIDH / NHB), the standard modular floor area for a single-span naturally ventilated polyhouse structure is $250\text{ m}^2$ (typically measuring $28\text{ m} \times 9\text{ m}$ or $25\text{ m} \times 10\text{ m}$).
This modular dimension provides optimal natural chimney ventilation, manageable structural truss loading, and uniform microclimate.
Correct Option: Option 1 (250 sq meter).
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3
ICAR JRF Vegetable Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Litchi fruit reaches optimum harvest maturity when total soluble solids : titratable acidity ratio reaches
Harvest Maturity Index of Litchi (Litchi chinensis):
Litchi is a non-climacteric fruit that must reach peak physiological ripeness on the tree before harvesting.
The standard chemical maturity index is when the TSS : Titratable Acidity ratio reaches $\ge 40$ (TSS attains $18 - 20^\circ\text{Brix}$ while titratable acidity declines to $0.4 - 0.5\%$, yielding $\frac{20}{0.5} = 40$).
Correct Option: Option 4 (40).
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4
ICAR JRF Vegetable Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which of the following is NOT a postharvest quarantine treatment?
Hot Water Treatment (HWT): Immersion in hot water ($48^\circ\text{C}$).
Sulphitation: A chemical preserving and anti-browning treatment using sulfur dioxide ($SO_2$) in dried raisins and apricots, not a quarantine treatment.
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