Structural Organisation in Animals – Daily Practice Problem (DPP)

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🎯 NEET 2026 Daily Practice Problem (DPP)

Topic: Structural Organisation in Animals | 20 High-Yield MCQs

Q1. Ciliated epithelium is found in:

  1. Bronchioles and Fallopian tubes
  2. Eustachian tube and stomach lining
  3. Fallopian tubes and urethra
  4. Bile duct and esophagus
✅ View Answer & Explanation

Correct Answer: (1) Bronchioles and Fallopian tubes
Explanation: Ciliated epithelium helps move particles or mucus in a specific direction. In bronchioles, it moves mucus; in fallopian tubes, it moves the ovum.

Q2. Which type of tissue correctly matches with its location?

  1. Smooth muscle – Wall of intestine
  2. Areolar tissue – Tendons
  3. Transitional epithelium – Tip of nose
  4. Cuboidal epithelium – Lining of stomach
✅ View Answer & Explanation

Correct Answer: (1) Smooth muscle – Wall of intestine
Explanation: Smooth muscles are involuntary and found in the walls of visceral organs like the intestine. Tendons are dense regular connective tissue.

Q3. The cell junctions called ‘Tight, Adhering and Gap’ junctions are found in:

  1. Connective tissue
  2. Epithelial tissue
  3. Neural tissue
  4. Muscular tissue
✅ View Answer & Explanation

Correct Answer: (2) Epithelial tissue
Explanation: These junctions are characteristic modifications of the plasma membrane in epithelial tissues to provide structural and functional links.

Q4. Areolar connective tissue joins:

  1. Bones with bones
  2. Fat body with muscles
  3. Integument with muscles
  4. Bones with muscles
✅ View Answer & Explanation

Correct Answer: (3) Integument with muscles
Explanation: Areolar tissue is present beneath the skin (subcutaneous) and connects skin (integument) to underlying muscles.

Q5. Mast cells of connective tissue contain:

  1. Vasopressin and relaxin
  2. Heparin and histamine
  3. Heparin and calcitonin
  4. Serotonin and melanin
✅ View Answer & Explanation

Correct Answer: (2) Heparin and histamine
Explanation: Mast cells release Histamine (vasodilator), Heparin (anticoagulant), and Serotonin (vasoconstrictor).

Q6. Which of the following is not a connective tissue?

  1. Bone
  2. Cartilage
  3. Blood
  4. Muscles
✅ View Answer & Explanation

Correct Answer: (4) Muscles
Explanation: Muscle is a distinct type of tissue (Muscular tissue). Bone, Cartilage, and Blood are specialized connective tissues.

Q7. The fibres of which of the following muscles are fusiform and do not show striations?

  1. Skeletal muscles
  2. Cardiac muscles
  3. Smooth muscles
  4. Voluntary muscles
✅ View Answer & Explanation

Correct Answer: (3) Smooth muscles
Explanation: Smooth muscles are fusiform (spindle-shaped), non-striated, and involuntary.

Q8. Intercalated discs are characteristic of:

  1. Skeletal muscle fibers
  2. Cardiac muscle fibers
  3. Smooth muscle fibers
  4. Ligaments
✅ View Answer & Explanation

Correct Answer: (2) Cardiac muscle fibers
Explanation: Communication junctions (intercalated discs) at some fusion points allow cardiac cells to contract as a unit.

Q9. Neuroglia make up more than ______ of the volume of neural tissue in our body.

  1. 10%
  2. 30%
  3. 50%
  4. 90%
✅ View Answer & Explanation

Correct Answer: (3) 50%
Explanation: Neuroglia protect and support neurons and constitute more than one-half the volume of neural tissue.

Q10. The head of the cockroach is said to be:

  1. Prognathous
  2. Hypognathous
  3. Opisthognathous
  4. Orthognathous
✅ View Answer & Explanation

Correct Answer: (2) Hypognathous
Explanation: The head is triangular in shape and lies anteriorly at right angles to the longitudinal body axis (mouthparts directed downwards).

Q11. In cockroaches, tegmina arises from:

  1. Prothorax
  2. Mesothorax
  3. Metathorax
  4. First abdominal segment
✅ View Answer & Explanation

Correct Answer: (2) Mesothorax
Explanation: The first pair of wings (Tegmina) arises from the mesothorax. The second pair (Hind wings) arises from the metathorax.

Q12. How many chambers are present in the heart of a cockroach?

  1. 10
  2. 12
  3. 13
  4. 4
✅ View Answer & Explanation

Correct Answer: (3) 13
Explanation: The heart of a cockroach consists of an elongated muscular tube differentiated into funnel-shaped 13 chambers with ostia.

Q13. Malpighian tubules in cockroaches are responsible for:

  1. Digestion
  2. Respiration
  3. Excretion
  4. Circulation
✅ View Answer & Explanation

Correct Answer: (3) Excretion
Explanation: Malpighian tubules absorb nitrogenous waste and convert it into uric acid (Uricotelic).

Q14. In male cockroaches, the mushroom-shaped gland is located in which segments?

  1. 4th to 6th abdominal segments
  2. 6th to 7th abdominal segments
  3. 2nd to 3rd abdominal segments
  4. 7th to 9th abdominal segments
✅ View Answer & Explanation

Correct Answer: (2) 6th to 7th abdominal segments
Explanation: A characteristic mushroom-shaped gland is present in the 6th-7th abdominal segments which functions as an accessory reproductive gland.

Q15. The vision in cockroaches is:

  1. Monocular and high resolution
  2. Binocular and low sensitivity
  3. Mosaic and high sensitivity
  4. Mosaic and high resolution
✅ View Answer & Explanation

Correct Answer: (3) Mosaic and high sensitivity
Explanation: Ommatidia form several images (Mosaic vision). It has high sensitivity but low resolution (Nocturnal vision).

Q16. Collagen fibres are secreted by:

  1. Fibroblasts
  2. Mast cells
  3. Macrophages
  4. Histiocytes
✅ View Answer & Explanation

Correct Answer: (1) Fibroblasts
Explanation: Fibroblasts are the main cells in connective tissue proper that secrete fibres (collagen, elastin) and matrix.

Q17. Tendons attach:

  1. Muscle to bone
  2. Bone to bone
  3. Skin to muscle
  4. Nerve to muscle
✅ View Answer & Explanation

Correct Answer: (1) Muscle to bone
Explanation: Tendons (Dense regular CT) connect skeletal muscles to bones. Ligaments connect bone to bone.

Q18. The epithelium found in the proximal convoluted tubule (PCT) of nephron in the kidney is:

  1. Simple squamous epithelium
  2. Simple cuboidal epithelium with microvilli
  3. Simple columnar epithelium
  4. Compound epithelium
✅ View Answer & Explanation

Correct Answer: (2) Simple cuboidal epithelium with microvilli
Explanation: The presence of microvilli (brush border) increases the surface area for reabsorption in the PCT.

Q19. Which cell junctions help to stop substances from leaking across a tissue?

  1. Gap junctions
  2. Adhering junctions
  3. Tight junctions
  4. Synaptic junctions
✅ View Answer & Explanation

Correct Answer: (3) Tight junctions
Explanation: Tight junctions fuse membranes together to prevent leakage. Adhering junctions cement cells, and Gap junctions facilitate communication.

Q20. In the heart of the frog, the sinus venosus opens into the:

  1. Left atrium
  2. Right atrium
  3. Ventricle
  4. Conus arteriosus
✅ View Answer & Explanation

Correct Answer: (2) Right atrium
Explanation: Sinus venosus is a triangular structure that receives blood through the vena cava and opens into the right atrium.

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