Question

Recalcitrant seeds are
A. Susceptible to desiccation
B. Susceptible to freezing
C. Tolerant to desiccation but susceptible to freezing
D. Tolerant to freezing but susceptible to desiccation
E. Tolerant to desiccation and freezing both
Choose the most appropriate answer from the options given below

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

Hint:

Recalcitrant = Difficult to store (Wet and Warm).
Orthodox = Standard storage (Dry and Cold).
Think of tropical fruits; they don't last long once they dry out.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
Seeds are classified into two main types based on their storage behavior: Orthodox and Recalcitrant.

Step 2: Detailed Explanation:

• Recalcitrant Seeds: These seeds cannot be dried (desiccated) to low moisture levels (below 15-20%) without losing viability. Examples include Mango, Rubber, Cocoa, and Coconut.

• Desiccation Sensitivity (A): Since they require high moisture to survive, they are highly susceptible to desiccation. If they dry out, they die. Statement A is True.

• Freezing Sensitivity (B): Because they contain a high amount of water, standard freezing (for seed bank storage) leads to the formation of ice crystals that rupture the cell membranes. Thus, they are susceptible to freezing. Statement B is True.

• Contrasting with Orthodox Seeds: Orthodox seeds (like Wheat or Rice) are tolerant to both drying and freezing, which allows them to be stored for long periods.
Final Answer:
Recalcitrant seeds are susceptible to both drying and low-temperature storage.