Question

The most important single factor affecting natural regeneration of Shorea robusta is the time lag between the falling of seed and the commencement of the ________.

• A. Monsoon
• B. Winter
• C. Summer
• D. Snowfall

Hint:

Sal seeds are recalcitrant and have a fleeting viability window of about a week. The faster the monsoon rains arrive after seed fall, the higher the regeneration success.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Natural regeneration of tree species depends on seed production, dispersal, and viability, which must align precisely with favorable seasonal weather conditions for successful germination.

Step 2: Detailed Explanation:
Shorea robusta (Sal) produces seeds that are characterized by extremely short viability, typically lasting only 7 to 14 days after falling from the parent tree.
Because the seeds cannot survive long dry periods, they require immediate moisture to germinate successfully.
In India, Sal seeds fall during the late summer (May to June).
If there is a long time lag between the falling of the seeds and the onset of the monsoon rains, the seeds dry out, lose their viability, and fail to germinate.
Therefore, the timely arrival of the monsoon is the most critical limiting factor for the natural regeneration of Sal forests.

Step 3: Final Answer:
The onset of the monsoon is the key factor determining the success of Sal natural regeneration.