Retrogressive metamorphosis occurs in

(1) Hemichordata

(2) Cephalochordata

(3) Urochordata

(4) Vertebrata

Subtopic:  Phylum Echinodermata |
 62%
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Some salient features and phyla of organisms are given below. Select the option which shows the correct combination of organism, its phylum and salient features.

1. Hydra Coelenterata Bilateral symmetry Cnidoblasts present
2. Planaria Platyhelminthes    Bilateral symmetry    High regeneration capacity
3. Ancylostoma    Annelida Bilateral symmetry Elongated and worm shape
4. Octopus Mollusca Radial symmetry External skeleton of shell present
Subtopic:  Phylum Ctenophora & Platyhelminthes |
 81%
From NCERT
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Select the correct statement regarding reproduction.

(1) Mating in dogs is synchronised with lunar cycle.

(2) Salamanders always have internal fertilisation.

(3) In Trygon, the male introduces sperms into female through a modified pelvic fin.

(4) Catla has internal fertilisation.

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
 69%
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Select the option that correctly matches characteristic features with the group of three animals.

(1) Skeleton of spicules − Sycon, Adamsia, Spongilla

(2) Excretion by flame − Taenia, Fasciola, Ancylostoma

(3) Mouth contains radula −  Dentalium, Octopus, Ophiura

(4) Jointed appendages −  Limulus, Apis, Laccifer

Subtopic:  Phylum Arthropoda |
 81%
From NCERT
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Among which of the animals urinary bladder is absent?

(1) Frog

(2) Crow

(3) Ostrich

(4) Camel

Subtopic:  Study of Aves & Mammals |
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Gemmule formation is a common mode of asexual reproduction in

(1) Paramecium

(2) Hydra

(3) sponges

(4) yeast

Subtopic:  Phylum Porifera |
 82%
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Identify the incorrect match from those given below

(1)

Jelly fish

Aurelia

Scyphozoa

(2)

Paddle worm

Chaetopterus

Polychaeta

(3)

Cray fish

Oniscus

Crustacea

(4)

Acorn worm

Balanoglossus

Enteropneusta

 

Subtopic:  Phylum Arthropoda |
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Which of the following is common among mammals?

(1) They do not moult

(2) They have seven cervical vertebrae

(3) They are carnivores

(4) They have ventral nerve cord

Subtopic:  Study of Aves & Mammals |
 58%
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Water transport system or canal system is a characteristic feature of which animal?

1. Spongilla

2. Hydra

3. Asterias

4. Echinus

Subtopic:  Phylum Porifera |
 91%
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Fresh water sponge is the common name of

(1) Hydra

(2) Sycon

(3) Spongilla

(4) Euspongia

Subtopic:  Phylum Porifera |
 83%
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