Explanation:

A-S; B-P; C-Q; D-R

Apis dorsata, the giant honey bee, is a honey bee of South and Southeast Asia, found mainly in forested areas such as the Terai of Nepal. They are typically around 17–20 mm long. Nests are mainly built in exposed places far off the ground, like on tree limbs, under cliff overhangs, and sometimes on buildings.

The silver carp is a species of freshwater cyprinid fish, a variety of Asian carp native to China and eastern Siberia, from the Amur River drainage in the north to the Xi Jiang River drainage in the south. Although a threatened species in its natural habitat, it has long been cultivated in China.

Harpadon nehereus, called the Bombay duck, bummalo, bombil, and boomla is a species of lizardfish. Adults may reach a maximum length of 40 cm, but the usual size is around 25 cm

Catla has an upturned month with infringed lips while rohu has a ventrally pointed mouth with fringed lips. However, both the hybrids possess a terminal mouth with slightly fringed lower lip. The hybrids also possess a pair of maxillary barbels but shorter and not as prominent as in rohu.