Question

Identify "Recalcitrant seeds":
A. Mungbean
B. Rubber
C. Tea
D. Wheat
Choose the correct answer from the options given below:

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

Hint:

Most tropical trees and large-fruited plants produce recalcitrant seeds. Most temperate crops and cereals produce orthodox seeds.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Seeds are classified into two main categories based on their storage behavior: Orthodox and Recalcitrant. Orthodox seeds can survive significant drying (desiccation) and cold storage. Recalcitrant seeds, however, lose viability if their moisture content drops below a relatively high threshold (usually 12-30%) and cannot survive freezing temperatures.

Step 2: Detailed Explanation:
- Mungbean (A) and Wheat (D): These are typical Orthodox seeds. They are small, dry, and can be stored for years in low humidity and cold temperatures without losing their ability to germinate. This allows them to be banked in seed vaults.
- Rubber (Hevea brasiliensis) (B) and Tea (Camellia sinensis) (C): These are classic examples of Recalcitrant seeds. They are large, have high moisture content when shed from the mother plant, and must be sown immediately. If they are dried out or stored in a standard refrigerator, the embryo dies. Other examples include Cocoa, Coconut, Mango, and Avocado.
Therefore, only B and C are recalcitrant.

Step 3: Final Answer:
Rubber and Tea seeds are recalcitrant.