🐾 Class 11 Biology – Structural Organisation in Animals MCQs (15 Tough NEET 2026 Questions)

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✅ CLASS 11 BIOLOGY – CHAPTER-WISE ADVANCED MCQs
NEET marking: +4 for correct, –1 for wrong, 0 for not attempted. Score will show in a popup after you attempt ALL questions in this chapter.
🐾 CHAPTER 7 — STRUCTURAL ORGANISATION IN ANIMALS
🔥 15 Very Tough, Conceptual, NEET-2026 Level MCQs
Chapter 7 – Structural Organisation in Animals
Q66. A histology slide shows:

• Branched muscle fibres
• Single central nucleus per fibre
• Intercalated discs at intervals
• Striations visible

What is the most accurate identification AND correct functional property?
  • A) Smooth muscle – involuntary, unstriated
  • B) Skeletal muscle – voluntary, fatigues quickly
  • C) Cardiac muscle – involuntary, rhythmic, syncytial contraction
  • D) Cardiac muscle – voluntary and non-rhythmic
Chapter 7 – Structural Organisation in Animals
Q67. A T.S. of an epithelium shows:

• Appears stratified, but all cells touch basement membrane
• Nuclei at different levels
• Cilia present on free surface

This represents:
  • A) Stratified squamous keratinised epithelium
  • B) Pseudostratified ciliated columnar epithelium
  • C) Cuboidal epithelium of kidney tubule
  • D) Columnar epithelium of intestine
Chapter 7 – Structural Organisation in Animals
Q68. Assertion (A): Blood is considered a connective tissue.
Reason (R): It originates from mesoderm and contains extracellular matrix (plasma).
  • A) Both A and R true; R correctly explains A
  • B) Both true but R does NOT explain A
  • C) A true, R false
  • D) A false, R true
Chapter 7 – Structural Organisation in Animals
Q69. Which of the following combinations is MOST characteristic of areolar connective tissue?
  • A) Only (i), (ii), (v)
  • B) Only (iv), (v)
  • C) All except (iv)
  • D) All (i to v)
Chapter 7 – Structural Organisation in Animals
Q70. During an injury, histamine released by mast cells causes:
  • A) Vasoconstriction → reduced blood flow
  • B) Vasodilation → increased permeability → inflammation
  • C) Decrease in WBC activity
  • D) Immediate clot formation
Chapter 7 – Structural Organisation in Animals
Q71. A student examines compact bone. Which term describes the entire functional unit?
  • A) Osteoid
  • B) Osteon (Haversian system)
  • C) Chondron
  • D) Trabecula
Chapter 7 – Structural Organisation in Animals
Q72. Which statement correctly differentiates smooth muscle from skeletal muscle?
  • A) Smooth muscle has intercalated discs
  • B) Smooth muscle = non-striated single nucleus; skeletal = striated multinucleate
  • C) Smooth muscle is voluntary
  • D) Both fatigue at same rate
Chapter 7 – Structural Organisation in Animals
Q73. Which is the correct pairing of gland, type and mode of secretion?
  • A) Goblet cells – unicellular – holocrine
  • B) Salivary gland – multicellular – merocrine
  • C) Sebaceous – endocrine – apocrine
  • D) Mammary – endocrine – merocrine
Chapter 7 – Structural Organisation in Animals
Q74. In frog, the digestive gland producing bile but storing it in gall bladder is:
  • A) Liver produces bile; gall bladder stores it
  • B) Pancreas produces & stores bile
  • C) Liver stores bile; pancreas produces
  • D) Stomach produces bile
Chapter 7 – Structural Organisation in Animals
Q75. Which tissues together form the histological triad required for coordinated body movement?
  • A) Skeletal muscle + Cardiac muscle + Adipose
  • B) Skeletal muscle + Tendons + Bone
  • C) Smooth muscle + Bone + Neurons
  • D) Loose connective + Bone + Cardiac muscle
Chapter 7 – Structural Organisation in Animals
Q76. A frog’s small intestine shows:

• Villi
• Columnar epithelium with microvilli
• Goblet cells
• Rich blood and lymph supply

This best describes:
  • A) Absorptive mucosa
  • B) Protective stratified epithelium
  • C) Glandular tissue
  • D) Areolar epithelium
Chapter 7 – Structural Organisation in Animals
Q77. Consider structures in Earthworm:

• Typhlosole
• Chloragogen cells
• Nephridia

Their correct functional pairing is:
  • A) Typhlosole – excretion
  • B) Typhlosole ↑ absorption; Nephridia = excretion
  • C) Chloragogen cells – locomotion
  • D) Nephridia – digestion
Chapter 7 – Structural Organisation in Animals
Q78. Which structure is present in cockroach but ABSENT in frog?
  • A) Malpighian tubules
  • B) Villi
  • C) Gizzard
  • D) All of these
Chapter 7 – Structural Organisation in Animals
Q79. Identify the correct feature of nervous tissue:
  • A) Axons divide repeatedly and undergo mitosis
  • B) Neurons are amitotic, long-lived, conduct impulses
  • C) Neuroglia generate action potentials
  • D) Synaptic transmission needs no chemicals
Chapter 7 – Structural Organisation in Animals
Q80. The intercalated discs of cardiac muscle perform which crucial function?
  • A) Increase calcium storage
  • B) Electrical coupling & synchronized contraction
  • C) Store ATP
  • D) Prevent ventricular overcontraction
NEET-Style Result – Chapter 6
Marking: +4 for correct · –1 for wrong · 0 for unattempted.

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