Animal Kingdom

Important characteristic that hemichordates share with chordates is

1. ventral tubular nerve cord
2. pharynx with gill slits
3. pharynx without gill slits
4. absence of notochord

Which among these is the correct combination of aquatic mammals?

1. Dolphins, Seals, Trygon
2. Whales, Dolphins, Seals
3. Trygon, Whales, Seals
4. Seals, Dolphins, Sharks

In case of poriferans, the spongocoel is lined with flagellated cells called

1. oscula
2. choanocytes
3. mesenchymal cells
4. ostia

In case of poriferans, the spongocoel is lined with flagellated cells called

1. mesenchymal cells
2. oscula
3. ostia
4. choanocytes

Which of the following characteristic features always holds true for the corresponding group of animals?

1. Possess a mouth with an upper and a lower jaw – Chordata
2. 3-chambered heart with one incompletely divided ventricle – Reptilia
3. Cartilaginous endoskeleton – Chondrichthyes
4. Viviparous – Mammalia

Which one of the following characteristics is not shared by birds and mammals?

1. Viviparity
2. Warm blooded nature
3. Ossified endoskeleton
4. Breathing using lungs

Which of the following features is not present in the Phylum Arthropoda?

1. Parapodia
2. Jointed appendages
3. Chitinous exoskeleton
4. Metameric segmentation

Which of the following features is not present in Periplaneta americana?

1. Indeterminate and radial cleavage during embryonic development
2. Schizocoelom as body cavity
3. Metamerically segmented body
4. Exoskeleton composed of N-acetylglucosamine

Choose the correct statement

1. All mammals are viviparous.
2. All cyclostomes do not possess jaws and paired fins.
3. All reptiles have a three-chambered heart.
4. All pisces have gills covered by an operculum.

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of Phylum

1. Mollusca
2. Protozoa
3. Coelenterata
4. Porifera.