Can this much amount can be paid in cash?
As per Income tax an amount to this extent cannot be received by cash or no cash transaction is permitted in law for an amount exceeding Rs. 50,000/-
What is the legal value of photocopy in the absence of its original receipt?
The photo copy of any document is not admissible as primary evidence.
If photocopy is accepted by court as valid legal documentary proof , what are the essential conditions linked to it as it is secondary evidence
photocopy of any document cannot be admitted as primary evidence by court even in the presence of any substantial evidence .
It can be considered as secondary evidence provided if corroborating evidence is available.
Can defendant be asked to declare source of funds
Yes he can be asked about it during cross examination.
If the cash receipt is declared false by court, can plaintiff initiate criminal proceedings against defendant
No, he cannot. He has nullified this evidence hence he has no other reason to travel beyond that until this has personally injured the plaintiff.