NEET 2025 MCQ with Answer Explanation : “Structural Organization in Animals”.

Here below some basic MCQ’s of “Structural organization in Animals” with answer which explained in details. Let’s check one by one which is given below.

1. Which of the following types of epithelial tissue is found in the alveoli of the lungs?
   a) Stratified squamous epithelium
   b) Simple squamous epithelium
   c) Cuboidal epithelium
   d) Columnar epithelium

Answer: b) Simple squamous epithelium

Explanation: The alveoli in the lungs require a very thin barrier to facilitate gas exchange. Simple squamous epithelium consists of a single layer of flat cells, which is ideal for this function as it allows efficient diffusion of gases like oxygen and carbon dioxide.

2. Which of the following connective tissues stores fat in the human body?
   a) Cartilage
   b) Blood
   c) Adipose tissue
   d) Bone

Answer: c) Adipose tissue

Explanation: Adipose tissue is a specialized form of connective tissue that stores fat. It helps in energy storage, insulation, and cushioning of internal organs.

3. In which type of muscle tissue are intercalated discs found?
   a) Skeletal muscle
   b) Cardiac muscle
   c) Smooth muscle
   d) None of the above

Answer: b) Cardiac muscle

Explanation: Intercalated discs are unique to cardiac muscle tissue and facilitate synchronized contraction of the heart by enabling rapid transmission of electrical impulses between cardiac muscle cells.

4. Which of the following is NOT a characteristic feature of smooth muscles?
   a) Spindle-shaped cells
   b) Non-striated appearance
   c) Voluntary control
   d) Found in the walls of hollow organs

Answer: c) Voluntary control

Explanation: Smooth muscle is an involuntary muscle, meaning it is not under conscious control. It is found in the walls of internal organs such as the stomach, intestines, and blood vessels.

5. Which type of cartilage is present at the ends of long bones to provide a smooth surface for joint movement?
   a) Elastic cartilage
   b) Hyaline cartilage
   c) Fibrocartilage
   d) Calcified cartilage

Answer: b) Hyaline cartilage

Explanation: Hyaline cartilage is the most common type of cartilage and is found at the ends of long bones in synovial joints. It provides a smooth, low-friction surface for joint movement and helps absorb mechanical stress.

6. Which of the following cells are involved in the secretion of hydrochloric acid (HCl) in the stomach?
   a) Goblet cells
   b) Chief cells
   c) Parietal cells
   d) Paneth cells

Answer: c) Parietal cells

Explanation: Parietal cells, found in the stomach lining, are responsible for secreting hydrochloric acid (HCl), which is essential for digestion and maintaining an acidic environment in the stomach.

7. Which connective tissue forms the framework of organs such as the spleen and lymph nodes?
   a) Areolar tissue
   b) Dense connective tissue
   c) Reticular connective tissue
   d) Adipose tissue

Answer: c) Reticular connective tissue

Explanation: Reticular connective tissue forms a supportive framework for soft organs like the spleen, lymph nodes, and bone marrow. It consists of a network of reticular fibers that support the organs’ structure.

8. Which of the following epithelial tissues is specialized for secretion and absorption?
   a) Simple squamous epithelium
   b) Stratified squamous epithelium
   c) Simple cuboidal epithelium
   d) Transitional epithelium

Answer: c) Simple cuboidal epithelium

Explanation: Simple cuboidal epithelium consists of cube-shaped cells that specialize in secretion and absorption. This type of tissue is commonly found in glands and kidney tubules.

9. Which of the following types of neurons transmits impulses from sensory receptors to the central nervous system (CNS)?
   a) Motor neurons
   b) Interneurons
   c) Sensory neurons
   d) Relay neurons

Answer: c) Sensory neurons

Explanation: Sensory neurons (afferent neurons) carry nerve impulses from sensory receptors (such as skin, eyes, ears) towards the central nervous system (CNS). They help the body respond to external stimuli.

10. The fibrous protein found in connective tissues that provides strength and elasticity is called:
    a) Keratin
    b) Collagen
    c) Actin
    d) Myosin

Answer: b) Collagen

Explanation: Collagen is a fibrous protein that provides tensile strength and structural support to various connective tissues such as tendons, ligaments, and skin. It also contributes to the elasticity of tissues.