It is Ottelia alismoides (L.) Pers. (Hydrocharitaceae)

thanks

Dear Rashid and Kaliyamurthy

You are correct for picture 1 and 2. But what we see in other picture is something else may be some plant of the family Alismataceae, may be some species of genus  Alisma or Sagittaria.

Dear Rashid and Kaliyamurthy

You are correct for picture 1 and 2. But what we see in other pictures are something else, may be some plant of the family Alismataceae, may be some species of genus  Alisma or Sagittaria.

Yes sir,

i agree with you. It may Alisma sp.