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 evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Mosquito larvae can be prevented to grow in ponds$/$ rice fields by inoculating them with

  1. Microcystis

  2. Aphanizomenon

  3. Oscillatoria

  4. Aulosira
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are different ways to prevent mosquito larvae to grow in ponds and rice fields. These can be done by not allowing the water to get stagnant. Also, it can be prevented by inoculating it with Microcystis cyanobacteria. Microcystis aeruginosa causes death of the larvae by producing neurotoxins and hepatotoxins.

Thus, the correct answer is 'Microcystis.'

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Which of the following statements is not correct?

  1. DDT and BHC are not good insecticides because they are highly soluble in water.

  2. DDT and BHC are not good insecticides because they are absorbed by the soil and contaminate root corps.

  3. Aldrin is not a good insecticide because it is not biodegradable.

  4. All of the above are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DDT and BHC 

both are good insecticides
since highly soluble in coater.

Multiple choice botany economically useful plants and entrepreneurial botany horticulture organic farming horticulture and organic farming

The pesticides used in organic farming are

  1. Organochlorines

  2. Carbamates

  3. Margosa, nicotine and pyrethrum

  4. All the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Margosa, nicotine and pyrethrum are natural pesticides obtained from neem, tobacco plants and chrysanthemum plants respectively.

Carbonates and organochlorides are pesticides that are manufactured using chemicals.
So the correct option is.

Multiple choice botany plant breeding plant breeding for disease resistance and insect resistance method of plant breeding for crop improvement plant breeding for food production

Which among the following is Eco-frinedly method to protect crops?

  1. Biological control

  2. Chemical control

  3. Mechanical method

  4. Electronical control
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In biological control method, birds, insects and other living organisms are deliberately let out in fields to selectively kill pests. This becomes an easy method for protecting crops against selective pests. This is an environment friendly method to control the pests.

Multiple choice botany classical genetics variation and its type natural selection introduction to genetics

The most likely reason for the development of resistance against pesticides in insects damaging crops is:

  1. genetic recombination

  2. directed mutations

  3. acquired heritable changes

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Pesticide resistance describes the decreased susceptibility of a pest population to a pesticide that was previously effective at controlling the pest. Pest species evolve pesticide resistance via natural selection: the most resistant specimens survive and pass on their acquired heritable changes traits to their offspring. Cases of resistance have been reported in all classes of pests (i.e. crop diseases, weeds, rodents, etc.), with 'crises' in insect control occurring early-on after the introduction of pesticide use in the 20th century. The Insecticide Resistance Action Committee (IRAC) definition of insecticide resistance is 'a heritable change in the sensitivity of a pest population that is reflected in the repeated failure of a product to achieve the expected level of control when used according to the label recommendation for that pest species'. Although the evolution of pesticide resistance is usually discussed as a result of pesticide use, it is important to keep in mind that pest populations can also adapt to non-chemical methods of control.
So the correct option is 'acquired heritable changes'.
Multiple choice sexually transmitted diseases stds and infertility reproductive health reproduction biology

A farmer introduced garden lizards into his agricultural fields to eradicate insects. This method is

  1. Environmental ethic method

  2. Biological control method

  3. Bio accumulation method

  4. Bio magnification method
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are different forms of pest control methods for the elimination of the insects and pests. If a farmer introduces the organisms or pests which can act on the other harmful pests, known as the biological control method. This method involves the use of living organisms for the eradication of the insects in the farm which destroy the crops. The lizards feed on the insects and protect the crops. 

Thus, the correct answer is option B. 

Multiple choice evs - i methods of preserving food food spoilage and food preservation food poisoning and food preservation methods food spoilage, adulteration and preservation

The cheapest method of protecting food grains from the attack of fungi to

  1. Burying in the ground

  2. Spraying with insecticide

  3. Drying in sunlight

  4. Furnigation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The improved solar energy treatment (ISET), which consisted of soaking of seeds in water (1:1 w/v) in a galvanized tub tightly covered with a transparent polythene sheet during September for 6 h (08.00-14.00 h) and keeping the seeds under the sun, was most effective, providing more than 96% control of loose smut, 73.64% control of Karnal bunt, and complete control of flag smut. The treatment had no adverse effects on seed germination. 

So, the correct option is C. (Drying in sunlight )

Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

The insecticide DDT is made by the reaction 
${\text{CC}}{{\text{l}} _{\text{3}}}{\text{CHO}}\left( {{\text{chloral}}} \right){\text{ + 2}}{{\text{C}} _{\text{6}}}{{\text{H}} _{\text{5}}}{\text{Cl}}\left( {{\text{chlorobenzene}}} \right) \to {\left( {{\text{Cl}}{{\text{C}} _{\text{6}}}{{\text{H}} _{\text{4}}}} \right) _{\text{2}}}{\text{CHCC}}{{\text{l}} _{\text{3}}}\left( {{\text{DDT}}} \right){\text{ + }}{{\text{H}} _{\text{2}}}{\text{O}}$
If 100 pound (Ib) of chloral were treated with 100 Ib  of chlorobenzene, how much DDT would be from 
(Assume the reaction goes to completion without side reactions side reactions or losses) [ 1 Ib = 453.6 ]  

  1. 157 Ib

  2. 71.3 Ib

  3. 84 kg

  4. 15 Ib
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The molar mass of chloral (CCl3CHO) is ~147.5 g/mol and chlorobenzene (C6H5Cl) is ~112.5 g/mol. DDT (C14H9Cl5) is ~354.5 g/mol. Based on stoichiometry, 100lb of chloral reacts with 100lb of chlorobenzene. Chloral is the limiting reagent. Calculation yields approximately 157 lb of DDT.

Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

Drawback of DDT as pesticides is that?

  1. it is less effective than others

  2. it becomes ineffective after some time

  3. it is a non-degradable substance

  4. it is very costly
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$The\quad correct\quad answer\quad is\quad option(c).$

 $DDT(dichlorodiphenyltrichloroethane)\quad is\quad a\quad colourless,crystalline,tasteless\quad and\quad almost\quad odourless\quad organo\quad chlorine\quad used\quad as\quad pesticide$.

$A\quad pollutant\quad that\quad is\quad not\quad broken\quad down\quad by\quad natural\quad processes\quad is\quad known\quad as\quad non-degradable\quad substance.$

$Hence\quad DDT\quad is\quad a\quad non-degradable\quad substance.$
Multiple choice biology animal tissue types of neuron nervous tissue neural tissues

Read the following statements (a-e) and answer the question which follows them 
(a) Dragonflies are used for controlling aphids 
(ii) Rumen is rich in methanogens 
(iii) increase in organic pollution increases BOD 
(d) man made technology for treatment of sewage is better than microbial treatment
(e)Lipases are commercially used in detergents 
How many of the above statements are correct? 

  1. one

  2. two

  3. three

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

Delicate dragonflies can rid the yards of aphids (small sap sucking insects) and mosquitoes and other insect pests.  Methane is produced in the rumen and hindgut of animals by a group of Archaea known collectively as methanogens, which belong to the phylum Euryarcheota. Among livestock, methane production is greatest in ruminants, as methanogens are able to produce methane freely through the normal process of feed digestion. A high BOD (biological oxygen demand) means that there is plenty of organic matter present. Microbial treatment is an integral part of the sewage disposal and hence cannot be said that man-made treatment of sewage is better. The cleaning power of lipase (or other enzyme containing) detergents increases markedly. The enzymes such as proteases, amylases, cellulases, and lipases are added to the detergents to improve their efficiency. 

So, the correct answer is 'Four'.

Multiple choice biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

One of the first measures taken to control houseflies is 

  1. The use of aerosols.

  2. Maintaining sanitation.

  3. Setting up fly traps.

  4. The use of insecticides.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sanitation is the primary method for controlling houseflies because it removes their breeding grounds, such as decaying organic matter and waste.