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Animal Kingdom — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

A zoologist finds an animal whose cells perform different tasks but are not organised into true tissues. Which further observation would best support placing it in Porifera?
  1. A gastrovascular cavity opens through a mouth on a hypostome.
  2. Water passes from ostia into a spongocoel and leaves through an osculum. ✓
  3. Eight rows of ciliated comb plates propel the animal.
  4. A muscular pharynx opens into a complete alimentary canal.
Answer: B. Sponges combine cellular-level organisation with a canal system: ostia admit water, the spongocoel receives it and the osculum provides the exit. The gastrovascular-cavity option is tempting because cnidarians are also structurally simple and aquatic, but they have true tissues.
Why not A: A single-opening gastrovascular cavity belongs to cnidarians, whose cells already form tissues.
Why not C: Comb plates can make a simple marine animal seem sponge-like, but they identify ctenophores.
Why not D: A complete gut and muscular pharynx require organ-system organisation, as in roundworms.
A marine segmented worm has lateral appendages used in swimming and a double ventral nerve cord. Which additional feature is expected?
  1. An open circulatory system bathing tissues directly
  2. Malpighian tubules opening into the alimentary canal
  3. Nephridia participating in excretion and osmoregulation ✓
  4. A radula scraping food into the mouth
Answer: C. The swimming appendages are parapodia, identifying Nereis and therefore Annelida; nephridia carry out excretion and osmoregulation. An open circulation seems plausible if segmentation is mistaken as uniquely arthropodan.
Why not A: Annelids circulate blood through vessels; open circulation is characteristic of arthropods and most molluscs.
Why not B: Malpighian tubules can be wrongly paired with any segmented invertebrate, but they are arthropod excretory organs.
Why not D: The radula is a molluscan feeding structure and is unrelated to the parapodia described here.
Consider the statements about non-chordates. I. Adult echinoderms and cnidarians are radially symmetrical, but only echinoderms are triploblastic coelomates. II. Annelids and arthropods are segmented, but a closed circulatory system is characteristic of annelids rather than arthropods.
  1. Both statements are incorrect.
  2. I is correct, but II is incorrect.
  3. I is incorrect, but II is correct.
  4. Both statements are correct. ✓
Answer: D. Both comparisons are correct: radial symmetry arose in animals with different germ-layer and cavity plans, while segmentation occurs with either closed or open circulation. The shared headline traits tempt students to transfer every other feature across each pair.
Why not A: This discards two useful distinctions merely because each pair also shares a conspicuous feature.
Why not B: Arthropod circulation is open, whereas annelid blood remains within a closed system of vessels.
Why not C: Cnidarians are diploblastic and lack a coelom; adult echinoderms have three germ layers and a true coelom.

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Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsStructural Organisation in Animals

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Questions

How many NEET questions are there on Animal Kingdom?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.