Environmental Studies · Biology

Pesticides and Pest Control

1,236 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

All of the following are true as per the passage, except:

Directions: Answer the given question based on the following passage:

In a ‘back to the basics’ approach, organic farmers use just plant and animal origin additives to boost production of crops and to protect them from pests and insects. One commonly used technique is to use dried leaves of Azadirachta indica for pest control.
Many organic farmers attest to the efficacy of the use of this technique. The dried leaves not only emit a strong smell that discourages pests from coming near to the plant, but also produce pheromones, or plant hormones, that upset the metabolic system of the pests if inhaled by the pests. The traditionally used pesticides, although effective, leave residue that is toxic to both humans and farm animals. Also, these insecticides and pesticides are absorbed by the plant and its fruit, thereby making their way into the human food chain. Even spraying crops meant for dairy animals or for animals reared for meat also results in the toxicity passing onto the end users.
The use of this non-traditional insect killer is not without its controversies. Many researchers believe that though the toxicology of traditional insecticides and pesticides is known, can be contained by controlled spraying, and treated symptomatically, the long term side effects, on humans, of the leaching of the chemicals present in Azadirachta indica into the groundwater, or absorption into the crops, are not known. These researchers believe that just because deleterious after effects of organic farming additives are not known, it cannot be taken to mean that they are not there at all. Also, some scientists have raised concerns about the effect of the phyto-hormones released by this natural pesticide on the plants that it is supposed to protect.

  1. No long term adverse effects of naturally found insecticides have been found.

  2. The harmful side effects of traditional methods of crop protection can be eliminated by need based usage.

  3. Humans, ultimately, are at the receiving end of the toxins disseminated through agriculture.

  4. At least one plant hormone targets the metabolism of plant pests.

  5. A common consensus on the merits of organic farming has proven to be elusive.

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

(1) Incorrect; the passage states that no harmful effects of organic farming are not known, yet. (2) Correct; the passage states that the harmful effects of traditional insecticides can be contained OR treated symptomatically. (3) Incorrect; the passage states, with two example, how humans are at the top of the food chain. Hence, it can be inferred that the humans are at the receiving end of all the toxins spread through agriculture. (4) Incorrect; the passage, citing the example of Azadirachta indica, points out that the phyto-hormones of the plant target metabolic system of the pests. (5) Incorrect; since there is both support and opposition of organic farming, it can be said that a common consensus has proved elusive.

Multiple choice
  1. a herbicide

  2. a fungicide

  3. a weedicide

  4. an insecticide

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

DDT was a commonly used pesticide for insect control in the United States until it was cancelled in 1972 by the United States Environmental Protection Agency (EPA). DDT was initially used by the military in WW II to control malaria, typhus, body lice and bubonic plague (1).

Multiple choice
  1. Benzene

  2. D.D.T

  3. Ethylene

  4. Bromide

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

DDT (dichlorodiphenyltrichloroethane) is a persistent organic pollutant. While it is a famous pesticide, it is not primarily known as an ozone-depleting substance; however, in the context of older multiple-choice questions, it is often grouped with environmental pollutants. Note: Methyl bromide is a more accurate ozone-depleting pesticide, but it is not an option here.

Multiple choice
  1. Organisms at once develop resistance to it

  2. It is significantly less effective that other pesticides

  3. It’s cost of production is high

  4. It’s not easily and rapidly degraded in nature

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

DDT is non biodegradable.

Multiple choice
  1. digestive system

  2. nervous system

  3. circulatory system

  4. muscular system

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

The chemical, which kills or inhibits the growth of insects is called insecticide. These chemicals control insects by acting upon the respiratory system or nervous system.

Multiple choice
  1. Herbicides kill plant mostly by blocking PS-Il (photolysis of water) and occasionally phloem transport

  2. Insecticides kill insects mostly through impairment of nerve conduction and sometimes through respiratory arrest

  3. Both (a) and (b)

  4. None of the above

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

Herbicides kill weeds and unwanted plants in cultivated land. Insecticides are those chemicals that destroy or kill insects. Herbicides kill plant mostly by blocking PS-II and occasionally phloem transport.Insecticides kill insects mostly through impairment of nerve conduction and sometimes through respiratory arrest

Multiple choice
  1. Alkaloid

  2. Steroid

  3. Amino acid

  4. Protein

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

During sporulation, many Bt strains produce crystal proteins (proteinaceous inclusions), called δ-endotoxins, that have insecticidal action.

Multiple choice
  1. Pesticides are poisonous.

  2. Pesticides cause resistance in case of over use.

  3. Pesticides cannot discriminate between pests and non pests.

  4. Pesticides are only chemical in nature.

  5. Pesticides are slowly improving ecosystems all over the world.

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

Pesticides are of synthetic or artificial pesticides and biological or natural pesticides. They are not always chemical in nature.

Multiple choice
  1. Study of effect of vehicular emissions on water bodies

  2. Study of effect of harmful chemicals on living organisms

  3. Study of chemical fertilizers and pesticides

  4. Study of effect of human activities on ecology

  5. none of the above

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

Environmental toxicology, also known as entox, is a multidisciplinary field of science concerned with the study of the harmful effects of various chemical, biological and physical agents on living organisms. It is a young field that has developed rapidly over the past 40 years. Environmental toxicology involves the studying of sources, pathways, transformations, and effects of chemicals that are harmful in the environment.

Multiple choice

It can be inferred from the passage that DDT is especially dangerous because

Read the passage and answer the following question.

THE FIRST ENVIRONMENTALIST: RACHEL CARSON

Rachel Louise Carson received her degrees in marine biology from the Pennsylvania College for Women and in zoology from the Johns Hopkins University. Her true calling turned out to be much broader in range than the academic study of wildlife, however. As Carson’s career as a scientific writer progressed, she became interested in the effects of artificial chemicals on the natural environment. Through her published research, she was the first to direct public attention to the environmental damage caused by the indiscriminate use of pesticides in agriculture. She is thus regarded as the public figure who launched the environmentalist movement.

Upon enrolling in college, Carson had initially intended to major in English and become a journalist or novelist. Her attentiveness to presentation allowed her to convey even rather dry facts in an evocative prose style that held the attention of the general reader. Wedded to her extensive academic training in biology, Carson’s talent for expressive writing positioned her ideally to bring scientific findings about ecology to a mass audience. She published a famous trilogy about the delicate and complex ecology of the sea, beginning with Under the Sea-Wind. That first volume took a large-scale approach, describing the living systems of the ocean in everyday, easily understood terms. Under the Sea-Wind was only a moderate commercial success, but it, along with Carson’s writings for the United States Fish and Wildlife Service, set the stage for her second volume, published ten years after the first. The Sea Around Us made Rachel Carson a household name. It became not only a bestseller but also a National Book Award winner. In it, Carson examined more explicitly than before the effects of human action on the creatures of the ocean. The last book in the trilogy was The Edge of the Sea, in which Carson trained her writerly and scientific gaze on the shoreline of the East Coast to examine the endangered organisms that populated it.

These books established Carson as a public figure who advocated respect for the environment, but the work that would be her most lasting legacy was yet to come. She began to examine data on the effects of agricultural pesticides, spurred in part by a letter from two friends who owned a farm in Massachusetts and expressed concern that sprayed pesticides were causing harm to local wildlife. Carson’s research convinced her that high exposure to pesticides such as DDT threatened not only beneficial insects and birds but also people. She put her conclusions in a landmark fourth scientific volume, Silent Spring. In the famous image that gave the book its title, Carson hypothesized about an ecosystem in which the calling of birds had been silenced by poison in soil and groundwater.

Carson alleged that the regulations governing use of these chemicals were inadequate, though her positions were not as extreme as they are sometimes now characterized. She did not support the outright banning of pesticides. Rather, she objected to “indiscriminate” use, which is to say, use without any thought for caution and moderation. Eventually, Carson’s views were taken seriously at the highest levels of government. President John F. Kennedy’s Science Advisory Committee solicited her advice on how to improve rules about pesticide use. She also testified before Congress. Through her influence, she assisted in bringing about far stricter controls on toxic chemicals such as DDT, which deteriorates slowly and thus remains in soil and groundwater for very long periods of time.

Although Carson’s fame meant that she was in demand as a public speaker, she much preferred the solitude of research and writing. She employed assistants but frequently did even tedious archival research herself to avoid wasting time reviewing material with which she was already familiar. The same concern with clarity and elimination of waste characterized her writing itself. Though Carson died in 1964, two years after the publication of Silent Spring, that book is still frequently cited in environmental policy recommendations by analysts and regulators. Her best-selling work, it also remains a staple of high school and college science classes. Indeed, more than one major publication has deemed Carson one of the most influential figures of the twentieth century.
  1. it is the most commonly used pesticide

  2. its taste attracts birds

  3. it does not disappear quickly

  4. it takes a long time to kill insects

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

There are two places in the passage that refer to DDT. Out of the two, it is at the second place “Through her influence, she assisted in bringing about far stricter controls on toxic chemicals such as DDT, which deteriorates slowly and thus remains in soil and groundwater for very long periods of time”, that the answer is provided.

Multiple choice
  1. Sodium azide

  2. Sodium arsenite

  3. Sodium amide

  4. Sodium chlorite

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

Sodium arsenite is a compound with formula NaAsO2. It is the sodium salt of arsenous acid. It is a crystalline solid consisting of sodium cations, Na+ and catena-arsenite anions, [AsO2]nn, which are infinite -O-As(=O)- chains, similar in structure to selenium dioxide, SeO2. It is a pesticide.

Multiple choice
  1. organic natural compounds

  2. inorganic natural compounds

  3. organic synthesized compounds

  4. all of the above

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

Biological control, or biocontrol, involves using natural enemies or organic natural compounds (like pheromones or botanical pesticides) to manage insect populations without relying on synthetic chemicals.

Multiple choice
  1. Bacillus thuringiensis

  2. Cactoblastis cactorum

  3. Phytopthora infestans

  4. Bacillus subtilis

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

Bacillus thuringiensis (Bt) is a soil bacterium that produces proteins toxic to certain insect larvae, including the gypsy moth. It is widely used as a biological control agent in agriculture and forestry.