The question is about understanding the impact of weeds on crops. Let's examine each statement to determine which one is incorrect:
Weeds compete with crops for space: This statement is correct. Weeds grow in the same area as crops, taking up valuable space that could otherwise be used by the crops themselves.
Weeds compete with crops for light: This statement is correct. Weeds can overshadow crops, reducing the amount of light the crops receive, which is essential for photosynthesis.
Weeds compete with crops for nutrients: This statement is correct. Weeds absorb nutrients from the soil, leaving fewer resources for the crops to grow healthily.
Weeds have no effect on the yield and quality of crops: This statement is incorrect. Weeds can significantly affect the yield and quality of crops by competing for resources like space, light, and nutrients. They can reduce crop yields and overall quality.
Therefore, the statement "Weeds have no effect on the yield and quality of crops" is the one that is NOT correct regarding weeds' impact on crops.
The correct answer is (D) Weeds have no effect on the yield and quality of crops.
Let’s break down the statements:
(A) Weeds compete with crops for space: This is correct. Weeds grow alongside crops and take up space that could otherwise be used by the crops.
(B) Weeds compete with crops for light: This is correct. Weeds often grow taller or spread in a way that blocks sunlight from reaching the crops, affecting their growth.
(C) Weeds compete with crops for nutrients: This is correct. Weeds absorb nutrients from the soil, which could otherwise be available for crops, potentially reducing crop growth.
(D) Weeds have no effect on the yield and quality of crops: This is incorrect. Weeds negatively affect both the yield and quality of crops by competing for space, light, water, and nutrients, and they can also harbor pests and diseases.
Thus, (D) is the incorrect statement, as weeds do affect both the yield and quality of crops.
List-I (Method of weed control) | List-II (Measure of weed control) |
(A) Preventive method of weed control | (I) Proper crop rotation |
(B) Cultural method of weed control | (II) Control of Lantana camara (Prickly Pear) by Lantana bugs |
(C) Chemical weed control | (III) Use of herbicide |
(D) Biological weed control | (IV) Use of weed-free seeds |