Question

Match List I with List II :

List I                     List II
A. Conjunctive tissue      I. Specialised cells in the vicinity of guard cells
B. Casparian strips        II. Endodermal cells rich in starch
C. Subsidiary cells        III. Tissue between xylem and phloem
D. Starch sheath           IV. Endodermal cells with suberin deposition

Choose the correct answer from the options given below :

• A. A-III, B-IV, C-I, D-II
• B. A-IV, B-III, C-I, D-II
• C. A-IV, B-III, C-II, D-I
• D. A-III, B-IV, C-II, D-I

Hint:

Casparian strips = Control of water (Suberin). The starch sheath is just another name for the endodermis but specifically in the stem.

Answer 1

The Correct Option is A

Step 1 : Understanding the Question: This question requires matching anatomical terms used in plant biology with their specific structural descriptions or functional locations. It covers features found in both root and stem anatomy of dicots and monocots. Step 2 : Key Formulas and Approach: The approach relies on a clear understanding of the internal organization of plant organs. Key markers include identifying where suberin is deposited, where starch is stored in the stem, and the specific names given to supportive cells in the epidermis or vascular cylinder. Step 3 : Detailed Explanation:
Conjunctive Tissue (A): In the primary structure of a root, particularly in dicots, there is parenchymatous tissue situated in the gaps between the xylem and the phloem bundles. This tissue is referred to as conjunctive tissue. It often becomes meristematic later during secondary growth. Thus, A matches with III.
Casparian Strips (B): The endodermis of the root serves as a biological checkpoint. The cells of this layer possess radial and tangential walls with a deposition of a waxy, water-impermeable material called suberin. This deposition takes the form of strips called Casparian strips. Thus, B matches with IV.
Subsidiary Cells (C): In the epidermis of leaves, the stomatal pore is flanked by guard cells. Frequently, a few neighboring epidermal cells in the immediate vicinity of these guard cells become specialized in their shape and size to assist in stomatal movement. These are called subsidiary cells. Thus, C matches with I.
Starch Sheath (D): In the anatomy of a dicotyledonous stem, the innermost layer of the cortex is the endodermis. Because these cells are often highly enriched with starch grains for storage, this layer is popularly known as the starch sheath. Thus, D matches with II.