1. A lettuce grower has noticed that over the past two decades, he has had to us
ID: 258663 • Letter: 1
Question
1.
A lettuce grower has noticed that over the past two decades, he has had to use more applications of pesticide per season in order to achieve the same crop quality. What is this phenomenon?
eutrophication
salinization
2 Which method of farming conserves water?
increasing irrigation
3.When is the rigid nature of plant cells best maintained?
Photosynthesis is maximized.
Water is allowed to escape from the cells freely.
Water intake is adequate.
Light is adequate.
4.
A corn grower has noticed that over the past two decades, she has had to use more applications of pesticide per season to achieve the same crop quality. What could she do to reduce the amount of pesticides that are needed and also improve her crop production?
Add extra nitrogen to her fields
Switch to a different crop, or plant multiple crops.
Use an irrigation system to make sure the corn has ample water.
biomagnificationExplanation / Answer
1. The pesticide treadmill.
Continuous apply of a particular pesticide results in developing resistance power in that particular pest community. Suppose a dosage 'X' would worked perfectly before for a pest species. But due to continuous over use of that 'X' dosage, pests remain unaffected now upon exposure to dosage 'X'. So, we need to increase the amount of dosage (eg, '2X' ) get the desired result as previous. This is called as pesticide treadmill.
Biomagnification means increase of the conc. of a particular substance along with the food chain.
Eutrophication means huge amount of nutrients in water bodies results in algal bloom.
Salinization means increasing the salt content of soil.
2. Increasing irrigation.
Irrigation means application of water in the field in a controlled and scientific way which promotes water conservation and hinders wastage. It is very helpful in dry surroundings as well as low rainfall receiving areas. It promotes equal amount of water distribution to each plant in a field in such a way that every plant gets neither too little or too much of water content.
Compost helps to increase soil quality.
Crop rotating helps to avoid exhaustion of soil due to exposure to same crop.
Mulching also helps in improving soil quality.
3. Water intake is adequate.
Plants store water in their cell vacuole. These vacuoles exert a pressure called turgor pressure. Plants maintain their cell regidity with the help of this turgor pressure. A plant having a good turgor pressure is a healthy plant.
4. Plant a cover crop in between corn growing seasons.
Legume type of crop could be planted in between the corn season. This is helpful for restoring the soil fertility as well as reducing the need of pesticide. Rhizobia living in the root of legumes help to fix the atmospheric nitrogen which works as fertilizer for plants.
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