One example of animals having a single opening to the outside that serves both as mouth as well as anus is

(1) Octopus

(2) Asterias

(3) Ascidia

(4) Fasciola

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

Which one of the following kinds of animals are triploblastic?

(1) Flat worms

(2) Sponges

(3) Ctenophores

(4) Corals

Which one of the following statements about certain given animals is correct?

1. Round worms (Aschelminthes) are pseudocoelomates

2. Molluscs are acoelomates

3. Insects are pseudocoelomates

4. Flat worms (Platyhelminthes) are coelomates

Which one of the following groups of animals is bilaterally symmetrical and triploblastic?

(1) Coelenterates (cnidarians)

(2) Aschelminthes (round worms)

(3) Ctenophores

(4) Sponges

Which one of the following pairs of animal comprises ‘jawless fishes’?

(1) Lampreys and eels

(2) Mackerels and rohu

(3) Lampreys and hag fishes

(4) Guppies and hag fishes

Peripatus is a connecting link between

(1) Ctenophora and Platyhelminthes

(2) Mollusca and Echinodermata

(3) Annelida and Arthropoda

(4) Coelenterata and Porifera

Which one of the following in birds, indicates their reptilian ancestry?

(1) Scales on their hind limbs

(2) Four chambered heart

(3) Two special chambers crop and gizzard in their digestive tract

(4) Eggs with a calcareous shell

Which one of the following is not a characteristic of phylum-Annelida?

(1) Closed circulatory system

(2) Segmentation

(3) Pseudocoelom

(4) Ventral nerve cord

Which one of the the following phyla is correctly matched with its two general characteristics?

(1) Arthropoda − Body divided into head, thorax and abdomen and respiration by mouth

(2) Chordata − Notochord at early stage only and separate anal and urinary openings to the outside

(3) Echinodermata − Pentamerous radial symmetry and mostly internal fertilization

(4) Mollusca − Normally oviparous and development through a trochophore or veliger larva