NEET (UG)

Practice Test 1 — Animal Kingdom

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

Animals lacking any body cavity are called:

Solution: Acoelomates (e.g. Platyhelminthes) have no body cavity.

Question 2

Choanocytes (collar cells) are found in:

Solution: Choanocytes line the canal system of sponges.

Question 3

The largest phylum in the animal kingdom is:

Solution: Arthropoda is the largest animal phylum.

Question 4

Tube feet and a water vascular system occur in:

Solution: Echinoderms have a water vascular system with tube feet.

Question 5

The four chordate features include all EXCEPT:

Solution: Open circulation is not a defining chordate feature.

Question 6

Branchiostoma belongs to the subphylum:

Solution: Amphioxus is a cephalochordate.

Question 7

Which class has members with a cartilaginous skeleton and no air bladder?

Solution: Chondrichthyes have cartilage skeletons and lack an air bladder.

Question 8

Mammary glands and hair are diagnostic of:

Solution: Mammals are defined by mammary glands and hair.

Section B — Assertion & Reason

Question 9

A: Cartilaginous fishes must swim continuously to avoid sinking.
R: They lack an air bladder to regulate their buoyancy.

Solution: Absence of an air bladder is exactly why they must keep swimming — R explains A.

Question 10

A: All vertebrates are chordates but not all chordates are vertebrates.
R: Protochordates have a notochord but never develop a vertebral column.

Solution: Protochordates being chordates without a vertebral column is why the set of chordates is larger — R explains A.

Question 11

A: The crocodile is unusual among reptiles in having a four-chambered heart.
R: Most reptiles have a two-chambered heart.

Solution: A is true, but R is false — most reptiles have a THREE-chambered heart, not two.

Question 12

A: Birds are well adapted for flight.
R: Their bones are pneumatic (hollow) and their forelimbs are modified into wings.

Solution: Lightweight pneumatic bones and wings are precisely the flight adaptations — R explains A.