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Structural Organisation in Animals — NEET Biology MCQs

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

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

Several organs interact physically and chemically to perform digestion. What level of organisation do they form?
  1. An organ system ✓
  2. A tissue
  3. A single organelle
  4. An intercellular substance
Answer: A. Two or more interacting organs performing a common function constitute an organ system. The hierarchy cell–tissue–organ–system distributes labour in multicellular animals.
Why not B: A tissue is a group of similar cells with intercellular material performing a function, not several organs acting together.
Why not C: An organelle is a subcellular structure and lies far below the level described.
Why not D: Intercellular substances contribute to tissues but do not coordinate whole organs.
A frog heart section shows a muscular chamber receiving blood from two atria and ejecting it into a ventral outflow sac. Which chamber is this?
  1. Right atrium
  2. Sinus venosus
  3. Single ventricle ✓
  4. Conus arteriosus
Answer: C. The three-chambered frog heart has two atria emptying into one ventricle, which opens into conus arteriosus. Distinguishing chamber from attached inflow and outflow structures is the key.
Why not A: The right atrium receives venous blood via sinus venosus rather than serving as the common ejecting chamber.
Why not B: Sinus venosus is a triangular venous receiving structure that joins the right atrium.
Why not D: Conus arteriosus is the sac-like vessel receiving ventricular output, not the muscular pump receiving both atria.
A skin disease removes mucus and greatly reduces cutaneous vascular exchange in a frog. Which paired problem is most likely?
  1. Impaired water uptake and reduced respiration, especially during submergence or dormancy ✓
  2. Loss of bile storage and protein digestion
  3. Failure of sound reception and equilibrium
  4. Loss of sperm transport through the kidney
Answer: A. Moist vascular skin serves both environmental water absorption and gas diffusion; during aquatic life, aestivation and hibernation its respiratory importance increases. One surface defect therefore disrupts two physiological systems.
Why not B: Bile storage and digestion depend on gall bladder, pancreas and gut rather than skin mucus.
Why not C: Tympanum and internal ear mediate hearing and balance.
Why not D: Male reproductive ducts provide that route and are anatomically separate from the skin.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Structural Organisation in Animals →

Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants

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Questions

How many NEET questions are there on Structural Organisation in Animals?

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.