Aquatic and Marine Biology

This is the correct option as fish does not show metamorphosis. 

Birds are warm-blooded (endothermic) organisms because they maintain a constant internal body temperature regardless of the external environment, using metabolic heat production. Fish, frogs, and snakes are all cold-blooded (ectothermic) - their body temperature changes with their surroundings and they rely on external heat sources to regulate their temperature.

Amphibians are uniquely adapted to survive in both aquatic and terrestrial environments. Their life cycle typically begins with water-based larval stages (like tadpoles) and metamorphoses into land-dwelling adults, though they must remain near moist habitats. This dual adaptation distinguishes them from purely terrestrial mammals, aerial birds, or entirely aquatic fish.

Whales are viviparous mammals that give birth to live young after gestation. Dog-fish (sharks) are typically ovoviviparous or viviparous depending on species, but whale is the clearer mammalian example. Ostrich is oviparous (lays eggs), and snakes are mostly oviparous. The question tests knowledge of mammalian reproduction.

This is the correct option. English carp is not a mariculture fish. It is a freshwater culture fish.

Heart of a fish is special because it only has venous blood.

Dolphins breathe through a hole at their top which is called blowhole. The blowhole is the external opening (like a nasal passage) to the lungs. Through its blowhole the dolphin inhales air containing vital oxygen and exhales respiratory wastes including carbon dioxide.

All birds have IgY antibody.

This is the correct option. In crocodile, the heart is four-chambered.

This is the correct option. The organisms of Amphibia class can live in aquatic as well as in terrestrial habitats.

They breathe in air through nostrils or blowholes located on the upper part of their heads.

Gills help in using oxygen dissolved in water.

Eastern and southern Asia (particularly China, India, Bangladesh, and Southeast Asia) dominate freshwater fish production due to extensive river systems, lakes, traditional aquaculture practices, and high fish consumption in diets. China alone produces over 60% of world's freshwater fish. Western Africa and South America have lower production.

Phycocyanobilin is a blue phycobilin. Phycocyanobilin is present only in the phycobiliproteins allophycocyanin and phycocyanin, of which it is the terminal acceptor of energy.It is predominately found in cyanobacteria red algae.

Yes, it is correct. Phycocyanin, carotenes and xanthophylls in green algae, phycoerythrin in red algae (rhodophytes) and fucoxanthol in brown algae.