Question

For weeds evolution, CSR refers to

• A. C- Competitiveness, S- Sensitiveness to stress, R- Ruderal habit
• B. C- Competitiveness, S- Stress tolerance, R- Ruderal habit
• C. C- Crop, S- Stress, R- Resistance
• D. C- Crop, S- Specific, R-Ruderal habit

Hint:

Most agricultural weeds are classified as "Ruderals" because frequent soil tillage represents a high-disturbance environment, where fast seed production is key to survival.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Grime's CSR Tripartite Theory is an ecological model that explains plant evolutionary adaptation strategies based on three primary environmental pressures: competition, stress, and disturbance.

Step 3: Detailed Explanation:
According to JP Grime, plants (including weeds) evolve along three primary strategic directions:
1. C - Competitors (Competitiveness): Plants adapted to exploit high-resource, low-stress, low-disturbance environments by growing rapidly to outcompete neighbors.
2. S - Stress tolerators (Stress tolerance): Plants adapted to survive in high-stress, low-disturbance environments (e.g., low water, low nutrients) through slow growth and resource conservation.
3. R - Ruderals (Ruderal habit): Plants adapted to high-disturbance, low-stress environments (such as tilled agricultural fields) by dedicating energy to rapid seed production.
Thus, CSR stands for Competitiveness, Stress tolerance, and Ruderal habit.

Step 4: Final Answer:
The correct option is 2, which corresponds to C- Competitiveness, S- Stress tolerance, R- Ruderal habit.