Answer : 3. "ऊँट पर रखी जाने वाली काठी "
Explanation :

1. In Rajasthani language, "Palan" means "saddle placed on a camel". It is made of wood or metal, and has a seat for riding on the back of a camel. The palan usually consists of a back, a mattress, and a halter. Palan camels are used for riding, carrying goods, or both. 

2. The owner of five hundred camels is called (Pachasadi).

3. The bundle of grass loaded on a camel is called hay.

4. Palan is tied on the back of the camel for carrying it.

5. To enhance the beauty of the camel, a cow's neck is worn.

6. In Marwari, the sitting of a camel is called (Jhaikna).