This I guess, is  Piperaceae probably some cultivar of Piper betel. 

Dear Md. Rishad Abdullah,

I agree with Dr. Mohanan, in this regard that it is undoubtedly a member of Piperaceae. It seems to me as Piper nigrum.

With regards,

Ankur J Saikia

Piperaceae family ok but colour not matching with piper nigram or betel

In Piper betel there are very many cultivars. In the home land Andaman and Nicobar Islands there are some natural variants also reported.  I still think it is some varient of P. betel

Dear Abdullah,

Green Algae (Cephaleuros) is observed on Black Pepper (Piper nigrum) leaf. this might be a similar infestation.

Ankur J Saikia

Please check "Piper ribesioides" https://antiqueprintmaproom.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/p/a/para_091_fru.jpg

Genus Piper, flower or fruit needed for correct identification at species level.

I Agree rajeev...It is Piper..sp. Plz upload any flower or fruiting img.....

I agree with Rajeev Kumar, it is Piper sp, but it is needed more details to know the specie or cultivar (nevertheless I guess that it could be Piper betel)  

Md. Rishad Abdullah

I think this plant is Piper sylvaticum Roxb. of Piperaceae family.

https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:683634-1

Thanks!