Question

Which of the following is a common strategy used by seeds to survive harsh environmental conditions?

• A. Rapid germination
• B. Deep burial
• C. Dormancy
• D. High metabolic activity

Hint:

Seed dormancy acts as a "biological clock" and protective shield.
It prevents a seed from germinating during a temporary warm spell in autumn, ensuring it remains dormant until the cold of winter has safely passed.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
To survive across seasons and colonize diverse habitats, plants must protect their offspring from environmental stresses, such as freezing winters, hot summers, or droughts.
The seed stage of a plant's life cycle is specifically adapted for survival and dispersal.

Step 3: Detailed Explanation:
The primary survival strategy used by seeds is dormancy:
- Seed dormancy is a state of suspended growth and development where the seed does not germinate, even when favorable environmental conditions (such as moisture and warm temperatures) are present.
- During dormancy, the seed's metabolic rate is reduced to near-basal levels, conserving stored food reserves and minimizing oxygen consumption.
- The seed remains protected by a hard seed coat and biochemical inhibitors (like abscisic acid) until specific environmental signals (such as chilling, light, or physical abrasion) indicate that conditions are optimal for long-term seedling survival.
Let us evaluate the other options:
- Rapid germination (A) under unfavorable conditions would expose vulnerable young seedlings to environmental stress, causing high mortality.
- Deep burial (B) is an agronomic or soil movement event, not a physiological strategy of the seed.
- High metabolic activity (D) would quickly deplete the seed's stored nutrient reserves, leading to starvation and death before environmental conditions improve.
Therefore, dormancy is the key survival strategy used by seeds.

Step 4: Final Answer:
The survival strategy used by seeds is dormancy, matching Option (C).