Would be thankful if provided needed authetic information addressing above querries.

We were visiting India recently. On our 50th wedding anniversary, we received 2 gifts (each less than INR 50000) from close relatives while in India. Am I allowed to deposit cash (Two deposits- each less than INR 50000) in my NRO account? I am a person of Indian origin settled in USA for past 50 years.

2) option#2: He sells the land and transfers the money to my bank account as gift and I transfer the money from my Indian bank account to my overseas bank account

For sending remittance from UAE self bank account to India self bank account for investment purpose ( say FD or mutual funds etc.) is there any limit of amount per remittance or per year which can be sent . Remittances are sent through bank channels only.
Consequently, any sum of money gifted to nephew shall not be chargeable to tax in the hands of the nephew. However, reverse shall be taxable since nephew is not a relative of his uncle in terms of the definition contained in Section 56 of the Act.
No, but they're fast! Xoom transfers can take anywhere from a matter of minutes to two or three business days to arrive in your recipient's hands or bank account. Bank deposit transfers are normally the fastest, and will arrive in India often in a matter of minutes for smaller amounts.

When you send money to any person abroad in India, the first $15,000 USD will be exempt from taxes by the IRS under the Gift Tax policy. This limit is charged on a per-person basis -- if you would like to send $15,000 USD each to multiple persons, you will still be off the hook for any gift taxes.