True or false: All viable seeds present on or in the soil constitute the soil weed seed bank.

• A. Sometimes true
• B. True
• C. False
• D. It depends on soil

Answer: (B)

The main idea is that the soil weed seed bank is the reservoir of seeds that are still viable and stored in or on the soil, with the potential to germinate in the future. If a seed is viable, it has the potential to become a weed, so it belongs to this bank. Therefore, all viable seeds present on or in the soil are part of the soil weed seed bank.

It’s important to remember that seeds that are dead or non-viable don’t count, and seeds buried in deeper soil layers can still contribute to the bank because they may germinate when conditions change. This concept helps explain why weed control isn’t just about current plants but also about limiting future seed production and reducing the seed reservoir over time.