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Structural Organisation in Animals: NEET previous year questions

Every Structural Organisation in Animals question from the official NEET papers on this site, with the answer and a worked solution.

The questions come from NEET 2026, Re-NEET 2026 and NEET 2020. Each shows its answer and solution when you open it, so you can attempt it first. For what the chapter covers and how NEET tests it, see the Structural Organisation in Animals guide.

Practise on the CBT screen6 questions, 6 minutes, marked +4 / −1Download PDF4 pages, 0.7 MB, with answers and solutions

NEET 2026 · the full paper

  1. NEET 2026 · Q146

    Male frogs can be distinguished from female frogs due to the presence of

    Statement I: Bulging eyes
    Statement II: Vocal sacs
    Statement III: Webbed digits in feet
    Statement IV: Copulatory pad on first digit of fore limbs
    Statement V: Olive green-coloured skin with dark irregular spots

    Choose the correct answer from the options given below

    1. (1)

      II and III only

    2. (2)

      III and V only

    3. (3)

      I and II only

    4. (4)

      II and IV only

    Answer and solution

    Answer: (4)

    Male frogs are distinguished from females by two secondary sexual characters: vocal sacs (used to amplify croaking during the breeding season) and a copulatory pad on the first digit of the fore limbs (to grip the female during amplexus). Bulging eyes, webbed digits, and olive-green skin with dark spots are common to both sexes. Hence only II and IV.

  2. NEET 2026 · Q166

    Choose the correct statements regarding frog's anatomy:

    Statement I: Hepatic portal system is the special venous connection between liver and intestine.
    Statement II: There are twelve pairs of cranial nerves arising from the brain.
    Statement III: The ureters and oviducts open separately into the cloaca in female frogs.
    Statement IV: Hind-brain consists of cerebellum, medulla oblongata and optic lobes.
    Statement V: Sinus venosus joins the right atrium of heart.

    choose the correct answer from the options given below:

    1. (1)

      I, II and III only

    2. (2)

      II and IV only

    3. (3)

      II and III only

    4. (4)

      I, III and V only

    Answer and solution

    Answer: (4)

    The hepatic portal system is a special venous connection that carries blood from the intestine to the liver.

    Frogs have 10 pairs of cranial nerves, not 12 pairs.

    In female frogs, the ureters and oviducts open separately into the cloaca.

    The optic lobes are part of the midbrain, while the hindbrain consists mainly of the cerebellum and medulla oblongata.

    The sinus venosus opens into the right atrium of the heart.

    Therefore, the correct statements are I, III and V only.

Re-NEET 2026 · the full paper

  1. Re-NEET 2026 · Q103

    In water, frogs respire using _____________.

    1. (1)

      skin

    2. (2)

      buccal cavity

    3. (3)

      lungs

    4. (4)

      trachea

    Answer and solution

    Answer: (1)

    Submerged frogs rely entirely on CUTANEOUS respiration: the moist, thin, richly vascularised skin allows dissolved oxygen and carbon dioxide to diffuse directly across it. On land the frog switches to buccal cavity respiration and pulmonary respiration through the lungs. The skin route is the only one available underwater. NCERT Class 11, Structural Organisation in Animals.

  2. Re-NEET 2026 · Q135

    In frogs, the number of pairs of cranial nerves arising from the brain are ______.

    1. (1)

      6

    2. (2)

      9

    3. (3)

      10

    4. (4)

      12

    Answer and solution

    Answer: (3)

    The frog's brain gives off TEN pairs of cranial nerves. This is a useful comparative point: humans and other mammals have twelve pairs, so the frog figure is a common target for confusion between the two. NCERT Class 11, Structural Organisation in Animals.

NEET 2020 · the full paper

  1. NEET 2020 · Q13

    If the head of cockroach is removed, it may live for few days because

    1. (1)

      the cockroach does not have nervous system.

    2. (2)

      the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.

    3. (3)

      the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.

    4. (4)

      the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

    Answer and solution

    Answer: (2)

    The cockroach can survive for a few days without its head because the major part of its nervous system, including segmental ganglia, is situated along the ventral part of its body. This allows basic functions to continue even without the head. Chapter: Structural Organisation in Animals.

  2. NEET 2020 · Q57

    Cuboidal epithelium with brush border of microvilli is found in

    1. (1)

      Ducts of salivary glands

    2. (2)

      Proximal convoluted tubule of nephron

    3. (3)

      Eustachian tube

    4. (4)

      Lining of intestine

    Answer and solution

    Answer: (2)

    Cuboidal epithelium with a brush border of microvilli is found in the proximal convoluted tubule of the nephron, where it increases the surface area for reabsorption. Chapter: Structural Organisation in Animals.

Practise Structural Organisation in Animals in the app: it brings back the questions you get wrong, so the chapter improves, not just your memory of these. Or try the free CBT mock. All chapters: NEET chapter-wise PYQs.

Questions

Are these the official NEET questions on Structural Organisation in Animals?

Yes. They are the questions NTA set in each paper, in its wording. The solutions are written by BrainIt.

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