Animal Kingdom Chapter-Wise Test 27

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following animals is an example of a urochordate?

Branchiostoma
Ascidia
Petromyzon
Myxine
2

Ascidia is a urochordate, where the notochord is present only in the larval stage.

Which of the following characteristics is common to both amphibians and reptiles?

Moist, glandular skin
Three-chambered heart
External fertilization in all species
Possession of hair or fur
2

Both **amphibians and most reptiles** have a **three-chambered heart**, except for **crocodiles**, which have a four-chambered heart.

Which of the following phyla is characterized by the absence of a coelom?

Annelida
Arthropoda
Platyhelminthes
Mollusca
3

Platyhelminthes are acoelomates, meaning they lack a body cavity between the body wall and the gut.

Which of the following is incorrect regarding mammals?

They are homeothermic (warm-blooded)
They possess mammary glands
All mammals are viviparous
They have a diaphragm for respiration
3

Not all mammals are **viviparous**. **Monotremes** (e.g., platypus) **lay eggs**.

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 of the following statements about amphibians is correct?

They have a four-chambered heart
They lay eggs with a hard shell
They exhibit external fertilization in most species
They are warm-blooded animals
3

Most amphibians exhibit **external fertilization**, where eggs are laid in water and fertilized outside the female's body.

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 of the following is an example of a bony fish?

Scoliodon
Pristis
Labeo
Trygon
3

Labeo (Rohu) belongs to class Osteichthyes, which includes bony fishes.

Which of the following structures is responsible for osmoregulation in crustaceans?

Malpighian tubules
Nephridia
Green glands
Flame cells
3

Green glands (also called antennal glands) in crustaceans help regulate salt and water balance.

What is the function of cnidoblasts in cnidarians?

Locomotion
Reproduction
Defense and capturing prey
Digestion
3

Cnidoblasts (stinging cells) in cnidarians are used for defense and capturing prey by injecting toxins.

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