Analysis of Central Institute for Arid Horticulture (CIAH):

• The Central Institute for Arid Horticulture (ICAR-CIAH) is physically situated at Beechwal, Bikaner (established 1993, upgraded to full institute in 2000).
• Note on RPSC Official Key: In the official Model Answer Key released by RPSC, Option (2) Sri Ganganagar was officially marked as the designated key for this question.
• CAZRI and AFRI are located in Jodhpur.

• Granulation is a serious physiological problem in Citrus fruits, particularly affecting Sweet orange (Mosambi), Mandarin, and Grapefruit.
• In granulated fruits, juice sacs (vesicles) become abnormally enlarged, hard, dry, woody, and granular with a pale color.
• The juice content, soluble solids (TSS), and acid content drop dramatically, rendering the affected fruit dry, tasteless, and commercially worthless.
• It is aggravated by high relative humidity, high temperature during ripening, and excessive tree vigor. Thus, Citrus (Option 4) is the correct answer.

• In papaya (Carica papaya), the seed rate depends largely on sex forms (gynodioecious vs dioecious).
• For gynodioecious cultivars (such as Pusa Delicious, Pusa Majesty, Surya, Coorg Honey Dew, Red Lady), every plant bears fruit; hence only one seedling per pit is planted, requiring a seed rate of 250 g/ha.
• For dioecious varieties (such as Pusa Giant, Pusa Dwarf, CO-1), 2 to 3 seedlings are planted per pit and male plants are later thinned out, requiring 400 to 500 g/ha.
• According to RPSC AAO official key, the standard seed rate is 250 g/ha (Option 2).

• 'Tikadi' is an early-maturing, traditional commercial cultivar of Ber (Indian Jujube, Ziziphus mauritiana), widely adapted to the arid soils of Rajasthan.
• The fruits are small to medium, round, sweet, and typically ripen during late December to early January.
• Other prominent ber varieties cultivated in Rajasthan include Gola, Seb, Umran, Banarasi Karaka, and Kaithli.
• Thus, Tikadi is a well-known cultivar of Ber (Option 3).