Question 1 of 5
Smother crops used in vegetable rotations help in what intercultural objective?
A
Improving soil fertility
B
Suppressing weed growth
C
Increasing water retention
D
Enhancing crop yield
Why: Smother crops are fast-growing plants that establish a dense canopy in a short time to suppress weed growth. Examples of smother crops include buckwheat, rye, mustard, and sorghum-sudangrass hybrids. These crops are often included in crop rotations or intercropping systems to manage weeds while improving soil quality. The dense canopy they create prevents sunlight from reaching weeds, thereby suppressing their growth. Therefore, the correct answer is B - Suppressing weed growth.
Question 2 of 5
What are the characteristics and importance of smother crops in horticulture? Explain their role in sustainable vegetable production systems.
Why: The answer should comprehensively discuss the characteristics, benefits, and role of smother crops in sustainable vegetable production, emphasizing their function in weed suppression and soil improvement.
Question 3 of 5
Which of the following is NOT a characteristic feature of smother crops in horticultural systems?
A
Fast-growing nature
B
Dense canopy formation
C
Slow establishment requiring 2-3 months
D
Effective weed suppression
Why: Smother crops are characterized by their fast-growing nature and ability to establish a dense canopy in a short time. The defining feature is their rapid growth and quick canopy development, not slow establishment. Options A, B, and D are all correct characteristics of smother crops. Option C states 'Slow establishment requiring 2-3 months,' which is contrary to the fundamental characteristic of smother crops. Therefore, the correct answer is C.
Question 4 of 5
Role of weeds in agricultural fields and their impact on crop production:
Why: The answer should comprehensively explain the competitive nature of weeds, their impact on crops through resource competition, and their role as pest/disease vectors.
Question 5 of 5
Which of the following best describes the primary competition caused by weeds in horticultural crops?
A
Competition for sunlight only
B
Competition for water and nutrients primarily
C
Competition for carbon dioxide only
D
Competition for soil space only
Why: Weeds primarily compete with crops for water and nutrients, which are the two most essential resources required for plant growth and development. While weeds may also compete for sunlight and soil space, the fundamental and most significant competition is for water and nutrients. These two resources directly determine crop growth rate, yield, and quality. Therefore, the correct answer is B - Competition for water and nutrients primarily.
