Animal Kingdom
Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following adaptations helps reptiles conserve water in dry environments?

Thin, moist skin
Cornified, keratinized skin
Gills for respiration
Secretion of ammonia as nitrogenous waste
2

Reptiles have cornified, keratinized skin that reduces water loss, allowing them to survive in dry environments.

Which of the following features is incorrect about birds?

They are oviparous
They excrete uric acid
They have an incomplete double circulation
They have hollow bones
3

Birds have complete double circulation, meaning oxygenated and deoxygenated blood are fully separated.

Which of the following is the most common mode of reproduction in echinoderms?

Asexual reproduction through fragmentation
Sexual reproduction with external fertilization
Hermaphroditism
Viviparity
2

Echinoderms are primarily dioecious and reproduce sexually with external fertilization. Although some show asexual reproduction, it is not the common mode.

Which of the following is a key adaptation seen in parasitic helminths?

Well-developed digestive system
Highly developed nervous system
High reproductive capacity
Presence of jointed appendages
3

Parasitic helminths, such as tapeworms, exhibit high reproductive capacity to ensure survival despite host immune responses.

Which characteristic feature differentiates Urochordata from Cephalochordata?

Presence of a vertebral column
Notochord is present only in the larval stage of Urochordata
Adults of Cephalochordata exhibit asymmetry
Both groups lack pharyngeal gill slits
2

In Urochordates (e.g., Ascidia), the notochord is present only in the larval stage, whereas in Cephalochordates (e.g., Branchiostoma), it is present throughout life.

Which of the following is a characteristic feature of phylum Porifera?

Presence of a gastrovascular cavity
Water canal system
Bilateral symmetry
Exoskeleton made of chitin
2

Poriferans have a unique water canal system, which helps in food gathering, respiration, and excretion.

Which of the following features is incorrect about birds?

They have pneumatic (hollow) bones
They excrete urea
They are oviparous
They have a four-chambered heart
2

Birds are uricotelic, meaning they excrete uric acid, not urea.

Which of the following is a distinguishing feature of class Cyclostomata?

Jaws present
Paired fins present
Cartilaginous endoskeleton
Circular, jawless mouth
4

Members of class Cyclostomata, such as lampreys and hagfish, lack jaws and have a circular, sucking mouth.

Which of the following statements about birds is incorrect?

They have pneumatic bones
They excrete uric acid as their primary nitrogenous waste
They have a diaphragm for respiration
They are oviparous
3

Birds lack a diaphragm; instead, they use air sacs for respiration.

Which of the following features is incorrect about mammals?

They have a diaphragm for respiration
They are cold-blooded
They possess mammary glands
They have heterodont dentition
2

Mammals are warm-blooded (homeothermic), not cold-blooded (poikilothermic).

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