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Questions and Answers
What is the primary basis for classifying pesticides according to the Environmental Protection Agency (EPA)?
What is the primary basis for classifying pesticides according to the Environmental Protection Agency (EPA)?
- Mode of action
- Type of pest controlled
- Chemical composition
- Toxicity (correct)
What is the characteristic of contact pesticides?
What is the characteristic of contact pesticides?
- They can only be used on specific types of plants
- They only act on the local area without entering the plant (correct)
- They require a specific temperature to be effective
- They can enter plant tissues and transport to the desired site
What is the function of systemic pesticides in plants?
What is the function of systemic pesticides in plants?
- They break down the plant's cell walls
- They have the capacity to enter plant tissues and transport to the desired site (correct)
- They only act on the local area without entering the plant
- They stimulate the plant's growth
Which of the following is an example of a systemic pesticide?
Which of the following is an example of a systemic pesticide?
What is the key difference between contact and systemic pesticides?
What is the key difference between contact and systemic pesticides?
What is the mechanism of action of chemical insecticides?
What is the mechanism of action of chemical insecticides?
What is a characteristic of insecticides?
What is a characteristic of insecticides?
How do insecticides compare to other pesticides in terms of acute toxicity toward nontarget species?
How do insecticides compare to other pesticides in terms of acute toxicity toward nontarget species?
What is a risk associated with the use of insecticides?
What is a risk associated with the use of insecticides?
What is the significance of insecticides in developing countries?
What is the significance of insecticides in developing countries?
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Study Notes
Classification of Pesticides
- Pesticides can be classified into four broad types according to the Environmental Protection Agency (EPA)
Mode of Action of Pesticides
- Pesticides can be categorized into two types based on their mode of action: contact and systemic pesticides
- Contact pesticides:
- Only act on the local area without entering the plant
- Example: Paraquat
- Systemic pesticides:
- Have the capacity to enter the plant tissues and transport to the desired site through the vascular system
- Examples: glyphosate and 2, 4-D
Insecticides and Pest Control
- Insecticides play a crucial role in controlling insect pests, especially in developing countries.
- Chemical insecticides used today are neurotoxicants, which act by poisoning the nervous systems of target organisms.
Toxicity of Insecticides
- Insecticides are generally not species-selective, meaning they can be toxic to a wide range of organisms.
- Mammals, including humans, are highly sensitive to the toxicity of insecticides.
- Insecticides have higher acute toxicity towards non-target species compared to other types of pesticides.
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