A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:
Eptatretus
Myxine
Neomyxine
Neomyxine
D.
Neomyxine
Petromyzon(the lamprey) belongs to the section Agnatha of the sub-phylum-Vertebrata. They have long, greenish brown, cylindrical body with smooth scaleless, slimy skin, jawless mouth, etc. They lay eggs in freshwater but their ammocoete larvae(lower) after metamorphosis return to the ocean.
The chitinous exoskeleton of arthropods is formed by the polymerisation of
Keratin sulphate and chondraitin sulphate
D-glucosamine
N-acetyl glucosamine
N-acetyl glucosamine
A senentary sea anemone gets attached to the shell lining of hermit crab. The association is
ectoparasitism
symbiosis
commensalism
commensalism
Metagenesis refers to
Presence of different morphic forms
Alternation of generation between asexual and sexual phases of an organism
Occurrence of a drastic change in form during post-embyonic development
Occurrence of a drastic change in form during post-embyonic development
Five Kingdom system of classification suggested by RH Whittaker is not based on
presence or absence of a well-defined nucleus
mode of reproduction
Mode of nutrition
Mode of nutrition
