A good number of Tilapia fishes are released in a pond having only different indigenous fish species grown naturally. Think and write which type of struggle for existence Tilapia fishes have to face to live in that pond.

A good number of Tilapia fishes are released in a pond having only different indigenous fish species grown naturally. Think and write which type of struggle for existence Tilapia fishes have to face survive.

State whether True or False: Introduction of Tilapia and giant African magur in the ponds of rural Bengal posed a huge problem for the existence of indigenous fishes.

An element A occupies group number 15 and period number 3, exhibits allotropy and it is tetra atomic. A reacts with caustic soda a to give B which is having rotten fish odour. A reacts with chlorine to give C which has a smell of garlic. Identity A, B and C. Write the reactions.

A man observe a fish at a depth of 6 cm from the surface of water in a pond. To hunt the fish, at what depth will he have to through the spear? Refractive index of water = (4)/(3) .