alleryଗଙ୍ଗା ନଦୀ ଡଲଫିନ୍ କାର୍ଯ୍ୟତଃ ଅନ୍ଧ ହୋଇଥିବାରୁ, ଏହା ଶିକାର କରିବା ପାଇଁ କେଉଁ ପ୍ରଣାଳୀ ବ୍ୟବହାର କରେ?
Aଥର୍ମାଲ ସେନ୍ସର
Bଚୁମ୍ବକୀୟ ରେଖା
Cଅଲ୍ଟ୍ରାସୋନିକ୍ ପ୍ରତିଧ୍ୱନି
Dଦୃଶ୍ୟ ଅପ୍ଟିକାଲ୍
Answer & Solution
Correct answer: C. ଅଲ୍ଟ୍ରାସୋନିକ୍ ପ୍ରତିଧ୍ୱନି
ଗଙ୍ଗା ନଦୀ ଡଲଫିନର ଆଖିରେ ଲେନ୍ସ ନଥାଏ ଏବଂ ଏହା ଅଲ୍ଟ୍ରାସୋନିକ୍ ଧ୍ୱନି ମାଧ୍ୟମରେ ନଦୀର ଗୋଳିଆ ପାଣିରେ ଗତିବିଧି କରେ।
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