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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.

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

Other NEET Biology chapters

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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, and you get your all-India rank on every one. Nothing on the site is on sale right now.

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.