Animal Kingdom Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about vertebrates is incorrect?

They have a well-developed notochord throughout life
They possess a closed circulatory system
They exhibit bilateral symmetry
They have a well-developed nervous system
1

In vertebrates, the **notochord is replaced by the vertebral column** during development.

Which of the following adaptations helps marine bony fishes maintain buoyancy?

Presence of an air bladder
Countercurrent gill mechanism
Cartilaginous endoskeleton
Continuous swimming
1

Marine bony fishes maintain buoyancy using an air bladder, which helps control their depth in water.

Which of the following is a correct characteristic of reptiles?

They are warm-blooded animals
They have an exoskeleton made of calcium carbonate
They excrete uric acid as their primary nitrogenous waste
They undergo external fertilization
3

Reptiles are **uricotelic**, meaning they excrete **uric acid** to conserve water.

Which of the following correctly differentiates between diploblastic and triploblastic animals?

Diploblastic animals lack mesoderm, while triploblastic animals have three germ layers
Diploblastic animals have bilateral symmetry, while triploblastic animals have radial symmetry
Only triploblastic animals show tissue-level organization
Only diploblastic animals exhibit metameric segmentation
1

Diploblastic animals (e.g., Cnidaria) have only two germ layers: ectoderm and endoderm. Triploblastic animals (e.g., Platyhelminthes and above) have an additional mesoderm.

Which of the following animals exhibits the phenomenon of alternation of generations (metagenesis)?

Taenia
Obelia
Ascaris
Pila
2

Obelia, a cnidarian, exhibits metagenesis where polyps reproduce asexually and medusae reproduce sexually.

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.

Which of the following structures is present in chordates during embryonic development?

Exoskeleton
Dorsal hollow nerve cord
Flame cells
Water vascular system
2

All chordates possess a dorsal hollow nerve cord at some stage of their development.

Which of the following is an adaptation for aerial mode of life in birds?

Presence of oil glands
Hollow bones
Crop and gizzard
Parental care
2

Birds have hollow (pneumatic) bones, which reduce body weight and facilitate flight.

Which of the following statements about mammals is incorrect?

They possess mammary glands
They are warm-blooded
All mammals have external ears
They have a four-chambered heart
3

Some mammals, such as **whales and dolphins**, lack **external ears (pinnae)**.

What is the primary function of parapodia in Nereis?

Reproduction
Locomotion
Excretion
Digestion
2

Parapodia are lateral appendages in Nereis that help in swimming and locomotion.

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