Structural Organisation in Animals NEET PYQs (2005–2026) with Solutions

10 solved Structural Organisation in Animals PYQs

Real NEET and AIPMT questions from this chapter, newest first. Try each one, then open the answer and the step-by-step explanation.

1. Question 1 (NEET 2026)

   NEET 2026EasyFrog: respiration in water and land

   In water, frogs respire using _____________.

   1. AOption A: skin
   2. BOption B: buccal cavity
   3. COption C: lungs
   4. DOption D: trachea

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   Correct answer: (A) skin

   Explanation

   Frogs respire on land and in water by two different methods. In water, the skin acts as the aquatic respiratory organ (cutaneous respiration): dissolved oxygen in water diffuses through the moist, highly vascular skin. On land, the buccal cavity, skin and lungs act as respiratory organs. Trachea are the breathing tubes of insects, not frogs. Hence the answer is option (A).

2. Question 2 (NEET 2026)

   NEET 2026EasyFrog: nervous system

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

   1. AOption A: 6
   2. BOption B: 9
   3. COption C: 10
   4. DOption D: 12

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   Correct answer: (C) 10

   Explanation

   In the frog, the nervous system has a central nervous system (brain and spinal cord), a peripheral nervous system (cranial and spinal nerves) and an autonomic nervous system. NCERT states that there are ten pairs of cranial nerves arising from the brain of the frog. (Humans, by comparison, have 12 pairs.) Hence the answer is option (C).

3. Question 3 (NEET 2026)

   NEET 2026MediumFrog Anatomy

   Choose the correct statements regarding frog’s anatomy: A. Hepatic portal system is the special venous connection between liver and intestine. B. There are twelve pairs of cranial nerves arising from the brain. C. The ureters and oviducts open separately into the cloaca in female frogs. D. Hind-brain consists of cerebellum, medulla oblongata and optic lobes. E. Sinus venosus joins the right atrium of heart. Choose the correct answer from the options given below:

   1. AOption A: A, B and C only
   2. BOption B: B and D only
   3. COption C: B and C only
   4. DOption D: A, C and E only

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   Correct answer: (D) A, C and E only

   Explanation

   Frogs have 10 pairs of cranial nerves, optic lobes belong to midbrain, and sinus venosus opens into the right atrium. Thus A, C and E are correct.

4. Question 4 (NEET 2025)

   NEET 2025EasyCirculatory System in Frog

   What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

   1. AOption A: Aorta
   2. BOption B: Pulmonary artery
   3. COption C: Pulmonary vein
   4. DOption D: Vena cava

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   Correct answer: (D) Vena cava

   Explanation

   In frogs, deoxygenated blood from the body returns to the heart through the vena cava.

5. Question 5 (NEET 2025)

   NEET 2025MediumMorphology and modifications

   Given below are two statements : Statement I : In a floral formula ⊕ stands for zygomorphic nature of the flower, and G stands for inferior ovary. Statement II : In a floral formula ⊕ stands for actinomorphic nature of the flower and G stands for superior ovary. In the light of the above statements, choose the correct answer from the options given below :

   1. AOption A: Both Statement I and Statement II are correct
   2. BOption B: Both Statement I and Statement II are incorrect
   3. COption C: Statement I is correct but Statement II is incorrect
   4. DOption D: Statement I is incorrect but Statement II is correct

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   Correct answer: (D) Statement I is incorrect but Statement II is correct

   Explanation

   In floral formula, ⊕ represents actinomorphic symmetry, not zygomorphic symmetry. G with a line below indicates superior ovary. Hence Statement I is incorrect and Statement II is correct.

6. Question 6 (NEET 2025)

   NEET 2025MediumMorphology and Anatomy of Frog

   Which of the following statement is correct about location of the male frog copulatory pad?

   1. AOption A: First and Second digit of fore limb
   2. BOption B: First digit of hind limb
   3. COption C: Second digit of fore limb
   4. DOption D: First digit of the fore limb

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   Correct answer: (D) First digit of the fore limb

   Explanation

   In male frogs, copulatory pads are present on the first digit of the forelimbs and help in holding the female during amplexus.

7. Question 7 (NEET 2025)

   NEET 2025MediumAnatomy of Flowering Plants

   Find the statement that is NOT correct with regard to the structure of monocot stem.

   1. AOption A: Hypodermis is parenchymatous.
   2. BOption B: Vascular bundles are scattered.
   3. COption C: Vascular bundles are conjoint and closed.
   4. DOption D: Phloem parenchyma is absent.

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   Correct answer: (A) Hypodermis is parenchymatous.

   Explanation

   In monocot stems, the hypodermis is sclerenchymatous, not parenchymatous. The other statements are correct features of monocot stems.

8. Question 8 (NEET 2025)

   NEET 2025EasySeed Structure

   In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called :

   1. AOption A: Coleoptile
   2. BOption B: Coleorhiza
   3. COption C: Integument
   4. DOption D: Aleurone layer

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   Correct answer: (D) Aleurone layer

   Explanation

   In cereal seeds, the outermost layer of the endosperm is a protein-rich layer called the aleurone layer.

9. Question 9 (NEET 2025)

   NEET 2025MediumMorphology of Flowering Plants

   Match List I with List II : Choose the option with all correct matches.

   1. AOption A: A-II, B-III, C-IV, D-I
   2. BOption B: A-IV, B-III, C-II, D-I
   3. COption C: A-IV, B-III, C-I, D-II
   4. DOption D: A-II, B-IV, C-III, D-I

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   Correct answer: (A) A-II, B-III, C-IV, D-I

   Explanation

   Scutellum is the cotyledon of a monocot seed. Groundnut is a non-albuminous seed. Epiblast is a rudimentary cotyledon in grasses. Perisperm represents the persistent nucellus.

10. Question 10 (NEET 2025)

    NEET 2025MediumEchinoderms

    Role of the water vascular system in Echinoderms is : A. Respiration and Locomotion B. Excretion and Locomotion C. Capture and transport of food D. Digestion and Respiration E. Digestion and Excretion Choose the correct answer from the options given below :

    1. AOption A: A and B Only
    2. BOption B: A and C Only
    3. COption C: B and C Only
    4. DOption D: B, D and E Only

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    Correct answer: (B) A and C Only

    Explanation

    The water vascular system in echinoderms helps in locomotion, respiration, and capture and transport of food.