How to know if the food you are buying is Organic?
Organic labelling
The word "Organic" is not a protected word in India. Anyone can use it, and it's variants like Organica, Organics, etc. None of these means that the product is Organic. As an informed consumer, don't rush to buy anything that has the word Organic or its derivative on the label. Instead, try to look for an authentic Organic Certificate.
Organic certificate
In India, two kinds of Organic Certificates are prevalent. One issued by 3rd parties accredited through National Program for Organic Production (NPOP), a body under the Ministry of Commerce & Industry. The second, a self-certification called Participatory Guarantee Scheme (PGS), implemented through the Ministry of Agriculture through the National Center of Organic Farming (NCOF).
NPOP certificate
PGS certificate
The cost of getting accredited under NPOP is quite high and not something that small and segregated farmers can afford. This led to the rise of PGS. PGS is a self-certification scheme in which a group of farmers come together and audit each other's fields and certify that organic practices are being followed. In 2015, the Govt. accepted the PGS program as a valid standard to grow Organic produce and brought it under the Ministry of Agriculture.
Within PGS, there are two level of certificates

PGS India Green
Once a farmer joins a PGS group and starts using Organic practices, she gets the PGS India Green certificate for her farm. This certificate means that the farm has begun the process to transition into an organic farm.
PGS India Organic
The PGS India Green certificate gets converted to PGS India Organic certificate after three years. This certificate means that the farmer has been carrying out Organic farming on the farm for more than three years.
How to identify organic produce at retail shelves?
Even after these two systems being in place, one will find a multitude of products wrongly labelled or marketed as Organic on retail shelves. This is soon going to stop now. Taking cognizance of the growing malpractices and misinformation campaigns about Organic produce, the Food Safety and Standards Authority of India has issued the draft Organic Food Regulations 2017. These cover both NPOP and PGS and are likely to be implemented effective July 2018. Once applied, it will also include labelling provisions, so anybody trying to mislead consumers through incorrect labelling will be liable for penal action.
Under this system, different existing (and possible future) Organic identification marks will make way for a single logo issued by FSSAI.
In summary
If you want to buy authentic organic products, look for either FSSAI Jaivik-Bharat, or India Organics (not to be confused with Organic India which is a leading Organic food Company in India), or PGS-India logo on the food packet.