Animal Kingdom
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following organisms exhibits metameric segmentation?

Taenia
Pheretima
Ascaris
Aplysia
2

Pheretima (earthworm) exhibits true metameric segmentation, a characteristic of phylum Annelida.

Which of the following statements about cyclostomes is correct?

They have jaws
They possess paired fins
They are ectoparasites
They have a bony endoskeleton
3

Cyclostomes (e.g., lampreys and hagfish) are jawless fishes that act as ectoparasites on other fishes.

Which chordate feature is replaced by the vertebral column in vertebrates?

Pharyngeal gill slits
Notochord
Dorsal nerve cord
Post-anal tail
2

The notochord is replaced by the vertebral column in vertebrates during development (NCERT, Chapter 4, page 56). Other chordate features persist in modified forms.

Which of the following statements about amphibians is incorrect?

They have a three-chambered heart
They are poikilothermic (cold-blooded)
They exclusively respire through lungs
They have a dual mode of life, living in water and on land
3

Amphibians respire through lungs, skin (cutaneous respiration), and gills (in the larval stage), not exclusively through lungs.

What is the major functional difference between open and closed circulatory systems?

In a closed circulatory system, blood is pumped into sinuses instead of vessels
An open circulatory system allows direct diffusion of nutrients and gases to tissues
A closed circulatory system is only found in invertebrates
Only vertebrates have an open circulatory system
2

In an open circulatory system (e.g., Arthropods), blood is pumped into open spaces (hemocoel), facilitating direct diffusion of gases and nutrients. In a closed system (e.g., Annelids, Chordates), blood circulates within vessels.

Which of the following statements about cnidarians is correct?

They have a complete digestive system
They are exclusively sessile organisms
They have a nerve net for coordination
They lack specialized stinging cells
3

Cnidarians possess a nerve net, which helps in basic coordination, but they do not have a centralized nervous system.

Which phylum exhibits indirect development with a trochophore larval stage?

Annelida
Echinodermata
Arthropoda
Platyhelminthes
1

Many annelids exhibit indirect development with a free-swimming trochophore larval stage.

Which of the following is an example of an ovoviviparous animal?

Frog
Shark
Pigeon
Platypus
2

Ovoviviparous animals, such as some sharks, retain eggs inside the female's body until hatching.

Which structure in amphibians allows them to hear airborne sounds?

Lateral line system
Tympanum
Spiracles
Operculum
2

The tympanum in amphibians functions as an external ear structure, detecting airborne sound vibrations.

Which of the following statements about cephalochordates is correct?

They possess a vertebral column
They exhibit indirect development
They are exclusively freshwater organisms
They lack a notochord in the adult stage
2

Cephalochordates, such as Branchiostoma, exhibit indirect development with a larval stage.

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