Question

Identify the plants from the following which do not exhibit Kranz anatomy:
A. Aloe
B. Zea mays
C. Agave
D. Opuntia
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, B and C only
• C. A, C and D only
• D. B, C and D only

Hint:

Remember this simple rule: Kranz anatomy is the structural hallmark of C₄ plants. CAM plants and C₃ plants lack it. Identifying the plant's photosynthetic pathway is the key to answering such questions.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Kranz anatomy is a specialized leaf structure present in C₄ plants, characterized by two photosynthetic cell types: mesophyll and bundle sheath cells, arranged in a wreath-like manner around vascular bundles. The question requires identifying plants that {lack} Kranz anatomy. C₃ and CAM plants lack this anatomy.
Step 2: Detailed Explanation:
Analyzing each plant's photosynthetic pathway:

A. {Aloe:} A CAM plant that conserves water via Crassulacean Acid Metabolism and does not possess Kranz anatomy.
B. {Zea mays (Maize/Corn):} A C₄ plant. It exhibits Kranz anatomy.
C. {Agave:} A CAM plant and does not have Kranz anatomy.
D. {Opuntia (Cactus):} A CAM plant and does not have Kranz anatomy.
The plants without Kranz anatomy are {Aloe} (A), {Agave} (C), and {Opuntia} (D).
Step 3: Final Answer:
The correct combination of plants lacking Kranz anatomy is A, C, and D.