Environmental Studies · Biology

Pesticides and Pest Control

1,208 Questions

Pesticides and Pest Control focuses on the management of invasive species through chemical, biological, and cultural methods. It includes topics like integrated pest management, herbicide targets, and the ecological impacts of toxic chemicals. This subject is frequently tested in environmental science and agriculture exams.

Integrated Pest ManagementBiological Control AgentsHerbicide MechanismsChemical Pesticide ToxicityGenetic Pest ResistanceInvasive Species Management

Pesticides and Pest Control Questions

Multiple choice

What is the increase in concentration of a pollutant from one link in a food chain to another called?

  1. Biodiversity

  2. Biohazard

  3. Bioassay

  4. Biomagnification

  5. Biopesticides
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biomagnification is the increase in concentration of a pollutant from one link in a food chain to another.Biomagnification is the bioaccumulation of a substance up the food chain by transfer of residues of the substance in smaller organisms that are food for larger organisms in the chain. It generally refers to the sequence of processes that results in higher concentrations in organisms at higher levels in the food chain (at higher trophic levels).

Multiple choice

Directions: Read the following information and answer the question that follows.

Dichlorophenoxyacetic acid, a pesticide being used in Andhra Pradesh since last ten years to destroy weeds without harming the rice crop, should be banned immediately lest they cause more harm to humans. Tests at Andhra Agricultural University have shown that the end product of acid used in to destroy weeds have been found in large quantities in the rice crop sold by hundred of thousands of Andhra farmers who used the pesticide over the past years.

Which of the following most conclusively strengthens the argument above?

  1. Scientists have observed an unusually high rate of blood cancer among consumers of Andhra rice over the past five years.

  2. Traces of dichlorophenoxyacetic acid have been found in the ground water of area where the given pesticide is used.

  3. Weeds have been found increasingly resistant to the pesticide.

  4. Industrial scientists, who contributed to the research and development of dichlorophenoxyacetic acid, conducted extensive tests to ascertain the safety of the chemical.

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dichlorophenoxyacetic acid should be banned from use in controlling weeds on rice farms in Andhra Pradesh because they pose a threat to humans. To make the connection between dichlorophenoxyacetic acid and human health problems, there must be a connection between rice and humans who suffer health problems. If, for instance, (1) consumers of Andhra rice have recently been found to have a high rate of blood cancer, it is likely that the traces of pesticide in the rice crop was also ingested by humans and caused the cancer.

Multiple choice

Consider the following statements:

  1. Stockholm Convention aims to eliminate the use of persistent organic pollutants. 2. Endosulfan, although classified as a red label pesticide by the Central Insecticides Board, is highly produced and consumed.

Which of the above statements is/are correct?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  1. Stockholm Convention on Persistent Organic Pollutants is an international environmental treaty, signed in 2001 and effective from May 2004, that aims to eliminate or restrict the production and use of persistent organic pollutants (POPs).
    1. Endosulfan is an off-patent organochlorine insecticide and acaricide that is being phased out globally and is acutely neurotoxic to both insects and mammals, including humans.
    2. Endosulfan, although classified as a yellow label pesticide by the Central Insecticides Board, is highly produced and consumed.
Multiple choice

Which of the following sprays helps to kill adult mosquitoes?

  1. BCG

  2. DDT

  3. ATS

  4. DPT

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DDT (Dichloro-Diphenyl-Trichloroethane) is a synthetic insecticide widely used to control adult mosquitoes. BCG and DPT are vaccines for tuberculosis and diphtheria-pertussis-tetanus respectively, while ATS is an antitoxin used for tetanus treatment - none kill mosquitoes.

Multiple choice

Which of the following is used as microtrial insecticide?

  1. Bacillus polymixa

  2. Bacillus subtilis

  3. Bacillus brevis

  4. Bacillus thuringiensis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bacillus thuringiensis is a bacterium widely used as a microbial insecticide due to its ability to produce crystal proteins that act as insect toxins against specific pests, making it a staple in biological pest control.

Multiple choice

In which of the following cases is plasmolysis not involved?

  1. Addition of salt in pickle to kill bacteria

  2. Salting of meat to kill germs

  3. Killing of weeds by sprinkling salts around their base

  4. Killing of insects in a field using insecticides
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Killing of insects using insecticides does not involve plasmolysis. The action is done by chemical means.

Multiple choice

Which of the following pairs is not correct?

  1. Atrazine : Photosynthetic inhibitors at photosystem II site B

  2. Glyphosate : Inhibitor of EPSP synthesis

  3. Paraquat : Cell membrane disruptor

  4. Metolachlor : Inhibitor of cell growth and division

  5. Trifluralin : Microtubule assembly inhibitor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthetic inhibitors at photosystem II site A type herbicides are chemicals that disrupt photosynthesis, so carbohydrates cannot be produced and the plant dies. These chemicals have activity when applied to leaf tissue, but they are typically used as pre-emergent applications as they are taken up by the roots of newly emerging weeds. For example, Atrazine, Hexazinone, Terbacil, Simazine.

Multiple choice

Match the herbicides in Group I with the target enzymes in Group II.

 
Group I Group II
P. Glyphosate 1. Nitrilase
Q. Bromoxynil 2. Acetolactatesynthetase
R. Sulphonylureas 3. Dehalogenase
S. Dalapon 4. 5 -Enolpyruvyl shikimate3-phosphate synthase

  1. P - 4, Q - 1, R - 2, S - 3

  2. P - 4, Q - 3, R - 2, S - 1

  3. P - 2, Q - 1, R - 4, S - 3

  4. P - 3, Q - 2, R - 4, S - 1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glyphosate targets EPSP synthase (5-enolpyruvyl shikimate-3-phosphate synthase) in the shikimate pathway. Bromoxynil is detoxified by nitrilase enzymes. Sulfonylureas inhibit acetolactate synthase (ALS), a key enzyme in branched-chain amino acid synthesis. Dalapon is metabolized by dehalogenase enzymes. Option A correctly matches each herbicide to its target enzyme.