Introduction

In plant anatomy, exam questions often ask which structure is a simple tissue in plants: epidermis, parenchyma, phloem or xylem, and the correct choice is always parenchyma. Simple tissues are made of only one type of cell, while complex tissues contain more than one cell type and perform specialized transport functions. Understanding this distinction is essential for solving MCQs in competitive exams like NEET, CSIR NET and other biology tests.​

What is a Simple Tissue in Plants?

• Simple permanent tissues are composed of only one type of similar, structurally and functionally uniform cells.​

• In plants, the main simple tissues are parenchyma, collenchyma and sclerenchyma, which perform fundamental roles like support, storage and photosynthesis.​

Therefore, among the given options, parenchyma is classified as a simple permanent tissue, making option (B) correct.​

Option (B) Parenchyma – The Correct Answer

Parenchyma is a classic simple tissue in plants, consisting of only one type of living, thin‑walled, usually isodiametric cells. These cells often have large intercellular spaces and are involved in storage, photosynthesis, secretion and wound healing.​

Key characteristics of parenchyma:

• Cells are living, with thin cellulose walls and prominent vacuoles.​

• Found in cortex, pith, mesophyll and medullary rays, forming the basic ground or fundamental tissue of many organs.​

Because it is made of only one cell type and performs general functions, parenchyma is a simple permanent tissue, so the answer to the question is (B) Parenchyma.​

Why Other Options Are Incorrect

Option (A) Epidermis

• The epidermis forms the outermost protective layer of the plant body and is part of the epidermal (dermal) tissue system.​

• Although epidermal cells are often similar, the epidermis commonly includes several specialized structures such as stomata (guard cells) and trichomes (hairs), making the overall dermal tissue system functionally more complex.​

In most standard classifications for exam purposes, epidermis is treated as part of the epidermal tissue system, not grouped under simple permanent tissues like parenchyma, collenchyma and sclerenchyma. Therefore, it is not the best answer here.​

Option (C) Phloem

• Phloem is a complex permanent tissue, composed of several different cell types such as sieve tubes or sieve cells, companion cells, phloem parenchyma and phloem fibres.​

• It conducts organic food (photosynthates) from leaves to other parts of the plant.​

Because phloem contains multiple distinct cell types working together, it is a complex tissue, not a simple tissue, so option (C) is incorrect.​

Option (D) Xylem

• Xylem is also a complex permanent tissue, consisting of tracheids, vessels, xylem fibres and xylem parenchyma.​

• It transports water and minerals from roots to aerial parts and provides mechanical support due to lignified elements.​

Because xylem is built from multiple specialized cell types, it is classified as a complex tissue, not a simple one, so option (D) is incorrect.​

Quick Comparison of the Options

Thus, in the MCQ “Which one of the following is a simple tissue system in plants?”, the correct option is unequivocally (B) Parenchyma.​