Match the following genera with their respective phylum. [2019]
| Genera | Phylum |
| (1) Ophiura | (i) Mollusca |
| (2) Physalia | (ii) Platyhelminthes |
| (3) Pinctada | (iii) Echinodermata |
| (4) Planaria | (iv) Coelenterata |
Select the correct option:
(1)-(iv), (2)-(i), (3)-(iii), (4)-(ii)
(1)-(iii), (2)-(iv), (3)-(i), (4)-(ii)
(1)-(i), (2)-(iii), (3)-(iv), (4)-(ii)
(1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)
Which of the following animals does not undergo metamorphosis? [2018]
Earthworm
Tunicate
Moth
Starfish
(1)
Metamorphosis is the process of transformation of an immature larva into an adult form in two or more distinct stages. Animals that undergo metamorphosis are said to have indirect development, e.g., tunicates, moth, starfish, etc. In the case of earthworm, development is direct which means no larval stage is present and hence, there is no metamorphosis.
Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system. [2018]
Amphibia
Reptilia
Aves
Osteichthyes
(3)
The alimentary canal of birds has additional chambers, the crop and gizzard. The crop stores and softens the food, however, the gizzard helps in crushing and churning the food, e.g., Pavo, Psittacula, Corvus.
Which one of these animals is not a homeotherm? [2018]
Macropus
Chelone
Camelus
Psittacula
(2)
Homeotherms are the animals that maintain constant body temperature, irrespective of surrounding temperature, by metabolic activity, e.g., birds and mammals. Turtle (Chelone) belongs to Class Reptilia and is poikilothermic or cold-blooded.
Important characteristic that hemichordates share with chordates is [2017]
Ventral tubular nerve cord
Pharynx with gill slits
Pharynx without gill slits
Absence of notochord
(2)
An important characteristic that hemichordates and chordates share is the presence of pharyngeal gill slits. Gill slits are dorsal in position in hemichordates, whereas they are lateral in chordates.
Which among these is the correct combination of aquatic mammals? [2017]
Dolphins, Seals, Trygon
Whales, Dolphins, Seals
Trygon, Whales, Seals
Seals, Dolphins, Sharks
(2)
Whales, dolphins, and seals are examples of aquatic mammals. Trygon and sharks are cartilaginous fishes.
Which of the following represents the order of 'Horse'? [2017]
Perissodactyla
Caballus
Ferus
Equidae
(1)
Perissodactyla represents the order of horse. Equidae is the family, caballus is the subspecies, whereas E. ferus is the species of horse.
In case of poriferans, the spongocoel is lined with flagellated cells called [2017]
Oscula
Choanocytes
Mesenchymal cells
Ostia
(2)
Spongocoel is the central body cavity of the sponges. It is lined by highly specialized flagellated cells called choanocytes.
Choose the correct statement. [2016]
All mammals are viviparous.
All cyclostomes do not possess jaws and paired fins.
All reptiles have a three-chambered heart.
All pisces have gills covered by an operculum.
(2)
Ornithorhynchus and Tachyglossus are oviparous mammals. Crocodile is a reptile that possesses a four-chambered heart. In cartilaginous fish (except Chimaera), gills are not covered by an operculum.
Which one of the following characteristics is not shared by birds and mammals? [2016]
Viviparity
Warm-blooded nature
Ossified endoskeleton
Breathing using lungs
(1)
All birds are oviparous, while all mammals except Ornithorhynchus (duck-billed platypus) and Echidna or Tachyglossus (spiny anteater) are viviparous.
