Glandular Epithelium: Unicellular vs Multicellular Glands
Biology · Structural Organisation in Animals · NEET
Glandular epithelium forms when some columnar or cuboidal cells become special for secretion. It has two kinds: unicellular glands (single cells, like goblet cells of the gut) and multicellular glands (many cells in a cluster, like salivary glands and the pancreas). Memory hook: "One cell = goblet, Many cells = salivary" — NEET asks this exact split almost every year.
Glandular epithelium has two forms: a single goblet cell (unicellular) in the gut lining, and a cluster of cells forming a multicellular gland such as the salivary gland. This one-cell vs many-cells split is the exact idea NEET tests.
Your doubts, answered
Is glandular epithelium an epithelial tissue or a connective tissue?
It is a special epithelial tissue. When some columnar or cuboidal epithelial cells start making and releasing a product (mucus, enzyme, hormone), that group is called glandular epithelium. It is NOT connective tissue. NEET matching questions often list it as 'Glandular Tissue' but its parent group is epithelium.
What is the difference between unicellular and multicellular glands?
A unicellular gland is a single secretory cell sitting alone among other cells — the goblet cell of the alimentary canal is the standard example. A multicellular gland is a cluster of many secretory cells working together, like salivary glands, the pancreas, or sweat glands. So the split is simply one cell versus many cells.
Are goblet cells unicellular or multicellular glands?
Goblet cells are the classic UNICELLULAR glands. They are single mucus-secreting cells scattered in the lining of the alimentary canal and airways. NEET has stated 'Goblet cells are unicellular glands' as a TRUE statement (2023), so remember this fact directly.
Which cells form glandular epithelium — columnar or cuboidal?
Glandular epithelium arises when columnar or cuboidal cells become specialised for secretion. Goblet cells specifically are modified columnar epithelial cells (NEET 2020). So both columnar and cuboidal can give rise to it, but goblet cells come from columnar cells.
Is glandular epithelium the same as compound epithelium?
No. Compound (stratified) epithelium has many cell layers for protection (for example the moist surface of the buccal cavity). Glandular epithelium is about secretion, not layers. NEET 2024 tested this by listing 'compound epithelium' and 'glandular epithelium' as separate rows in one match — do not mix them up.
⚠️ The NEET trap ✗ Marking the pancreas as a multicellular EXOCRINE gland only, or clubbing it with salivary glands as the same type. ✓ Salivary glands are the example of MULTICELLULAR glandular epithelium, while the pancreas is used as the ENDOCRINE glandular epithelium example (islets of Langerhans secrete hormones without a duct). NEET 2024 kept these in separate rows. 🧠 Read the pancreas row carefully.
Real NEET questions
NEET 2024
Match List I with List II.
List I: A. Unicellular glandular epithelium B. Compound epithelium C. Multicellular glandular epithelium D. Endocrine glandular epithelium
List II: I. Salivary Glands II. Pancreas III. Goblet cells of alimentary canal IV. Moist surface of buccal cavity
Given below are two statements:
Statement I: Goblet cells are unicellular glands.
Statement II: Earwax is the secretion of exocrine gland.
In the light of the above statements, choose the correct answer:
A · Both Statement I and Statement II are true ✓
B · Both Statement I and Statement II are false
C · Statement I is true but Statement II is false
D · Statement I is false but Statement II is true
Solution: Goblet cells are single secretory cells = unicellular glands, so Statement I is true. Earwax (cerumen) is released through a duct by an exocrine gland, so Statement II is also true. Both statements are true.
NEET 2020
Goblet cells of alimentary canal are modified from:
A · Chondrocytes
B · Compound epithelial cells
C · Squamous epithelial cells
D · Columnar epithelial cells ✓
Solution: Goblet cells are unicellular mucus-secreting glandular cells that are modified columnar epithelial cells specialised for secretion. Hence option (4), columnar epithelial cells, is correct.
Solved Structural Organisation in Animals NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
What are the two types of glandular epithelium based on number of cells?
Unicellular glands (single cell, e.g. goblet cells) and multicellular glands (a cluster of cells, e.g. salivary glands and pancreas).
Give one example each of unicellular and multicellular glands.
Unicellular gland: goblet cell of the alimentary canal. Multicellular gland: salivary gland (also sweat glands, pancreas).
Why are goblet cells called unicellular glands?
Because a single goblet cell by itself makes and releases mucus. It does not need a group of cells, so it is a gland made of just one cell.
Is glandular epithelium the same as exocrine and endocrine glands?
They describe different things. Unicellular vs multicellular is based on cell NUMBER. Exocrine vs endocrine is based on the MODE of secretion (through a duct vs directly into blood). A gland can be described by both.
Which cells give rise to glandular epithelium?
Columnar or cuboidal epithelial cells that become specialised for secretion. Goblet cells specifically come from columnar cells.
