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Animal Kingdom — Class 11 MCQs with Answers

Class 11 CBSE Biology · Chapter 4

90 practice questions · 30 Easy · 30 Medium · 30 Hard · Updated

Practise the most important Class 11 CBSE Biology questions from Chapter 4, "Animal Kingdom". You get 9 timed quizzes made from 90 NCERT-based MCQs, with answers and explanations. The questions are split into 30 Easy, 30 Medium and 30 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE & Maharashtra HSC Board exams, MHT-CET and NEET UG apart.

To score well in "Animal Kingdom", focus on diagrams, key terms and knowing NCERT line by line. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.

Use this chapter for focused revision. Start with the Easy set to check your basics on Animal Kingdom, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 11 Biology mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.

Key concepts: Animal Kingdom (Class 11 Biology)

Despite huge diversity, animals are classified on a few fundamental features — grade of body organisation, symmetry, germ layers, presence of a coelom, segmentation and the notochord. Applying this checklist sorts the kingdom from sponges through the invertebrate phyla to the chordates and their vertebrate classes.

Levels of organisation
Cellular (Porifera), tissue (Cnidaria), organ (Platyhelminthes) and organ-system (higher phyla) grades mark increasing division of labour in the body.
Symmetry
Animals are asymmetrical (sponges), radial (cnidarians, adult echinoderms) or bilateral (most others); bilateral forms have a distinct head end.
Germ layers
Diploblastic animals (Cnidaria) have ectoderm and endoderm with mesoglea between; triploblastic animals add a true middle layer, the mesoderm.
Coelom
A body cavity lined by mesoderm. Coelomates (annelids onward) differ from pseudocoelomates (Aschelminthes) and acoelomates (flatworms).
10 more key concepts, exam tips — free with sign-in.

Animal Kingdom — important questions & MCQs with answers (Class 11 Biology)

14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 76 are timed and scored when you sign in.

  1. Q1Easy

    Sponges belong to phylum:

    A.Chordata
    B.Cnidaria
    C.Mollusca
    D.Porifera✓ Correct

    Answer: D. Porifera

    Explanation: Sponges are Porifera: their pore-riddled body and choanocyte-lined canal system give a purely cellular level of organisation, unlike Cnidaria's tissue-level body built around stinging cnidoblasts.

  2. Q2Easy

    Basis of classification of animal kingdom does NOT include:

    A.Symmetry
    B.Geographical distribution✓ Correct
    C.Coelom
    D.Notochord

    Answer: B. Geographical distribution

    Explanation: Animal classification rests on body-plan characters -- symmetry, level of organisation, coelom, segmentation, notochord -- because these reflect evolutionary relationships; where a species lives is ecology, not a taxonomic criterion.

  3. Q3Easy

    Notochord is a defining feature of:

    A.Arthropoda
    B.Mollusca
    C.Chordata✓ Correct
    D.Annelida

    Answer: C. Chordata

    Explanation: Notochord, present at some stage of life, is one of the four defining chordate characters -- it is unique to Chordata and absent throughout Arthropoda, Mollusca and Annelida, however advanced their nervous systems.

  4. Q4Easy

    Notochord is found in:

    A.Chordates✓ Correct
    B.Mollusca
    C.Annelida
    D.Porifera

    Answer: A. Chordates

    Explanation: Notochord, the flexible dorsal supporting rod present at some stage of life, is a defining chordate feature; Mollusca, Annelida and Porifera never form one, however complex their other organ systems look.

  5. Q5Easy

    Cellular level of organisation is seen in:

    A.Arthropoda
    B.Annelida
    C.Porifera✓ Correct
    D.Chordata

    Answer: C. Porifera

    Explanation: Sponges alone show a purely cellular level of organisation, where cells work individually rather than as coordinated tissue; Cnidaria already groups similar cells into true tissue, one level up.

  6. Q6Easy

    True coelom is mesoderm-lined body cavity. Acoelomate phylum is:

    A.Annelida
    B.Platyhelminthes✓ Correct
    C.Arthropoda
    D.Chordata

    Answer: B. Platyhelminthes

    Explanation: Flatworms (Platyhelminthes) have no body cavity between the gut and body wall -- acoelomate -- unlike Annelida's true mesoderm-lined coelom or Chordata's organ-system-level body plan.

  7. Q7Medium

    Water canal system is characteristic of:

    A.Echinodermata
    B.Cnidaria
    C.Ctenophora
    D.Porifera✓ Correct

    Answer: D. Porifera

    Explanation: The water canal system, with choanocyte-lined canals for feeding and gas exchange, is unique to Porifera -- sponges have no gut or organs, so this canal network does the work other phyla assign to a digestive system.

  8. Q8Medium

    Asymmetrical body is seen in:

    A.Echinoderms
    B.All cnidarians
    C.Most sponges✓ Correct
    D.Annelids

    Answer: C. Most sponges

    Explanation: Most sponges have an irregular, asymmetrical body with no plane of symmetry at all -- a step below even the radial symmetry of cnidarians or the bilateral symmetry annelids show.

  9. Q9Medium

    Coelom is a:

    A.Sensory cell
    B.Brain part
    C.Excretory organ
    D.Body cavity lined with mesoderm✓ Correct

    Answer: D. Body cavity lined with mesoderm

    Explanation: A true coelom is a body cavity completely lined by mesoderm on all sides, marking coelomates off from pseudocoelomates (mesoderm lines only the outside) and acoelomates (no cavity) -- not a cell, organ or nerve structure.

  10. Q10Medium

    Cnidoblasts are used for:

    A.Anchorage, defence, prey capture✓ Correct
    B.Reproduction only
    C.Respiration
    D.Digestion only

    Answer: A. Anchorage, defence, prey capture

    Explanation: Cnidoblasts (nematocysts) in cnidarian tentacles fire stinging threads used for anchorage, defence and capturing prey -- a multi-purpose weapon, not a reproductive or digestive structure as the other options suggest.

  11. Q11Medium

    In protostomes, the blastopore develops into:

    A.Anus
    B.Mouth✓ Correct
    C.Coelom
    D.Notochord

    Answer: B. Mouth

    Explanation: In protostomes -- annelids, arthropods, molluscs -- the embryonic blastopore becomes the mouth first, with the anus forming later; this developmental order, not adult anatomy, is the actual basis of the protostome/deuterostome split.

  12. Q12Hard

    Snails belong to phylum:

    A.Arthropoda
    B.Mollusca✓ Correct
    C.Annelida
    D.Nematoda

    Answer: B. Mollusca

    Explanation: Snails are Mollusca: an unsegmented soft body with a calcareous shell and muscular foot, unlike Arthropoda's jointed exoskeleton or Annelida's true metameric segmentation, which snails lack.

  13. Q13Hard

    Assertion: Aschelminthes are pseudocoelomates. Reason: Their coelom is not lined by mesoderm.

    A.A true, R false
    B.Both true; R does not explain A
    C.Both A and R true; R explains A✓ Correct
    D.A false, R true

    Answer: C. Both A and R true; R explains A

    Explanation: Aschelminthes are pseudocoelomates precisely because their body cavity, though present, is not lined by mesoderm on the outer side -- the reasoning behind the assertion is exactly why the classification holds, not a coincidence.

  14. Q14Hard

    Unique mammalian feature is:

    A.Hair and mammary glands✓ Correct
    B.Feathers
    C.Scales
    D.Pneumatic bones

    Answer: A. Hair and mammary glands

    Explanation: Hair and mammary glands -- fur for insulation and milk-secreting glands for nursing young -- are the two features unique to Mammalia among vertebrates, unlike feathers (Aves) or scales (Reptilia).

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Animal Kingdom — FAQs

What are the key concepts in Class 11 Biology Animal Kingdom?+

Despite huge diversity, animals are classified on a few fundamental features — grade of body organisation, symmetry, germ layers, presence of a coelom, segmentation and the notochord. Applying this checklist sorts the kingdom from sponges through the invertebrate phyla to the chordates and their vertebrate classes. Key ideas include Levels of organisation, Symmetry, Germ layers, Coelom.

What does Class 11 Biology Chapter 4 (Animal Kingdom) cover on XamBaaz?+

It has 90 NCERT-based MCQs on "Animal Kingdom": 30 Easy, 30 Medium and 30 Hard. Together they make 9 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE & Maharashtra HSC Board exams, MHT-CET and NEET UG.

Are these "Animal Kingdom" questions free to practise?+

Yes. Sign in with Google to practise "Animal Kingdom" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.

How should I revise "Animal Kingdom" for the exam?+

Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.

Are these "Animal Kingdom" MCQs available with answers?+

Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.

Is there negative marking in the "Animal Kingdom" quizzes?+

Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip, the same negative marking as NEET UG. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.

What are the important questions from Animal Kingdom (Class 11 Biology)?+

The questions that matter most test Levels of organisation, Symmetry, Germ layers, Coelom. This page shows 14 solved important MCQs with answers and explanations; all 90 questions on the chapter are available as timed quizzes once you sign in.

Is there an online quiz for Animal Kingdom?+

Yes — Class 11 Biology Animal Kingdom has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.

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