NEET Biology Animal Kingdom MCQs Set 24

Answer: (b) Paramoecium

Explanation:
1. Paramecium has a slipper-shaped body with a pellicle and cilia, hence the name slipper animalcule.
2. Entamoeba is an amoeboid parasite, Giardia a flagellate and Euglena a green flagellate.

Teacher's Note:
1. Paramecium is a ciliated protozoan with two nuclei, macronucleus and micronucleus.

Answer: (a) Trichomonas

Explanation:
1. Trichomonas vaginalis is a flagellate that infects the female genital tract.
2. Trichonympha lives in termite gut, Trypanosoma causes sleeping sickness and Giardia causes diarrhoea.

Teacher's Note:
1. Trichomonas is sexually transmitted and is a flagellate protozoan.

Answer: (a) Plasmodium and Monocystis

Explanation:
1. Sporozoans are parasitic, produce spores and lack locomotory organs in the adult; Plasmodium and Monocystis are examples.
2. Entamoeba is a rhizopod, Paramecium a ciliate and Euglena and Trypanosoma are flagellates.

Teacher's Note:
1. Plasmodium causes malaria; Monocystis lives in the seminal vesicles of earthworm.

Answer: (c) Nosema

Explanation:
1. Nosema bombycis causes pebrine disease in silkworms.
2. Babesia affects cattle, Monocystis lives in earthworm and Plasmodium causes malaria.

Teacher's Note:
1. Pebrine is a serious disease of Bombyx mori, the mulberry silkworm.

Answer: (b) Euspongia

Explanation:
1. Euspongia is the commercial bath sponge with a soft spongin skeleton.
2. Spongilla is a freshwater sponge, Euplectella is Venus flower basket and Leucosolenia has a simple canal system.

Teacher's Note:
1. Remember: Euplectella = Venus flower basket; Hyalonema = glass rope sponge.

Answer: (c) Sea fan

Explanation:
1. Sea fan (Gorgonia) is a cnidarian colony.
2. Sea cow is a mammal, sea cucumber an echinoderm and sea horse a fish.

Teacher's Note:
1. Names with 'sea' are tricky: check the phylum, not the name.

Answer: (d) Pheretima

Explanation:
1. Earthworm (Pheretima) shows direct development.
2. Ascaris, Taenia and frog all pass through larval stages.

Teacher's Note:
1. Earthworm lays cocoons from which tiny worms hatch directly.

Answer: (b) Sea mouse

Explanation:
1. Sea mouse (Aphrodite) is a polychaete annelid.
2. Sea pen is a cnidarian and the others are vertebrates.

Teacher's Note:
1. Polychaetes include Nereis and Aphrodite.

Answer: (d) A complete digestive tract absent

Explanation:
1. Tapeworms have no digestive system and absorb nutrients through the body surface.
2. Hence neither mouth nor anus is present.

Teacher's Note:
1. Tapeworms are endoparasites living in digested food of the host.

Answer: (c) Jointed appendages

Explanation:
1. Arthropoda means jointed feet; all members have jointed appendages.
2. Wings, tracheae and complete metamorphosis are not universal.

Teacher's Note:
1. Chitinous exoskeleton and jointed legs define arthropods.

Answer: (d) Usually a closed type of blood vascular system

Explanation:
1. Arthropods have an open circulatory system with a dorsal heart.
2. The other three occur in many arthropods.

Teacher's Note:
1. Open circulation is also found in molluscs, except cephalopods.

Answer: (a) Limulus

Explanation:
1. Limulus (king crab) has changed little for millions of years.
2. It is a marine arthropod.

Teacher's Note:
1. Other living fossils: Latimeria, Sphenodon, Peripatus and Neopilina.

Answer: (a) Locusta

Explanation:
1. Locusta (locust) forms huge swarms and damages crops.
2. Culex and Aedes are mosquitoes and Apis is the honey bee.

Teacher's Note:
1. Gregarious means living in large groups.

Answer: (d) Cuttle fish

Explanation:
1. Cephalopods such as cuttle fish and squid force water out of the siphon.
2. Cypraea, Pinctada and Unio are slow gastropods or bivalves.

Teacher's Note:
1. Cephalopods are fast-moving and have closed circulation.

Answer: (c) Dentalium

Explanation:
1. Dentalium has a tusk-like tubular shell and belongs to Scaphopoda.
2. Neopilina is a living fossil of Monoplacophora.

Teacher's Note:
1. Scaphopoda = tusk shells.

Answer: (d) Mantle

Explanation:
1. The mantle is a fold of the body wall that secretes calcareous shell.
2. Radula rasps food and foot is for locomotion.

Teacher's Note:
1. Soft body, mantle and shell are typical of molluscs.

Answer: (b) Water vascular system

Explanation:
1. Water vascular system with tube feet is unique to echinoderms.
2. Canal system is found in sponges.

Teacher's Note:
1. Madreporite is the entry point of the water vascular system.

Answer: (a) Sea urchin

Explanation:
1. Aristotle's lantern is the chewing apparatus of the sea urchin.
2. It consists of five teeth.

Teacher's Note:
1. Sea urchin is Echinus.

Answer: (a) Tube feet

Explanation:
1. Tube feet are the locomotory and sensory organs of echinoderms and are part of the water vascular system.
2. Setae are of earthworm and parapodia are of Nereis.

Teacher's Note:
1. Tube feet are also used in respiration and food capture.

Answer: (c) Echinodermata

Explanation:
1. Echinoderms have no excretory organs, regenerate and are exclusively marine.
2. Other phyla have excretory organs.

Teacher's Note:
1. Spiny-skinned animals show pentamerous radial symmetry as adults.