Answer: Option B. -> Chordates
:
B
All animals that possess a notochord are called chordates. Vertebrata is a sub-phylum under Phylum Chordata and are hence, "vertebrate" is not synonymous to "chordate". Vertebratespossess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.

Answer: Option B. -> Annelida and Porifera — Phyla
:
B
Annelida and Porifera are phyla under the kingdom Animalia. Among the other options, Aves is a class under phylum Chordata, Hydrozoa is a class under phylum Cnidaria and Oligochaeta is a class under phylum Annelida. Arthropoda and Mollusca are phyla under the kingdom Animalia.

Answer: Option C. -> Cuttlefish and devil fish are true fishes
:
C
Cuttlefish is not a true fish; it is a mollusc, belonging to class Cephalopoda that also includes squids and octopuses. Devil fish is a species of eagle ray, an elasmobranch fish.

Answer: Option D. -> silkworm, lac insect and honey bee
:
D
Apis (Honey bee), Bombyx (Silkworm) andLaccifer(Lac insect) are economically important insects, as we get honey, silk and lac (from which shellac and certain red dyes are produced) respectively from them.

Answer: Option B. -> Alternation of generations
:
B
Metagenesis is basically the alternation of generations between sexual and asexual reproduction. In other words,a generation developed by sexual means is followed by one or more that reproduce asexually.Many cnidarians exhibit this. Based on this, cnidarians exhibit two basic body forms - the asexual polyp and sexual medusa. Many cnidarians are restricted to one of these types throughout their life. For example, Hydra is found in the polyp form, while the jellyfish (Aurelia) is found in the medusa form. Others, such as Obelia, exhibit both the forms during their life cycle, and thus, such cnidarians are the ones that exhibit metagenesis, as they keep alternating between the polyp and medusa stages.

Answer: Option C. -> Body supported externally by cuticle
:
C
In sponges, the body is supported by spicules made of calcium or silica or proteinaceous spongin fibres, but not cuticle.

Answer: Option D. -> Ophiura – brittle star
:
D
The common name of Antedon is sea lily, Asterias is sea star or starfish, Cucumaria is sea cucumber and Ophiura is brittle star. Sea urchin is the common name of Echinus.

Answer: Option B. -> Vipera
:
B
Fishes, amphibians and reptiles are poikilotherms or cold blooded. Vipera, commonly known as viper, is a snake (reptile) and is hence, a poikilotherm. Neophron(vulture) andAptenodytes(penguin) are birds, and Macaca(monkey) is a mammal. Birds and mammals are homeotherms (warm blooded).

Answer: Option A. -> Earthworm - Nephridia
:
A
Malpighian tubules are the excretory organs found in cockroach. Nephridia are excretory organs found in earthworm. Radula is a rasping or feeding organ found in molluscs such as apple snail. Comb plates are a unique feature of ctenophores, while jellyfish is a cnidarian.

Answer: Option B. -> Ciliated comb plates
:
B
Both cnidarians and ctenophores exhibit tissue level of organisation, and are also diploblastic. Cnidocytes or stinging cells are found only in cnidarians, while ctenophores possess unique ciliated comb plates which help in locomotion.