Tag: biopesticide

Quizzes (1) Questions (74)

Questions Related to biopesticide

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

What causes the inactive form of Bt toxin i.e. protoxin to get converted into its active form in the body of an insect?

  1. Temperature of the gut

  2. Enzymes present in the saliva

  3. Alkaline pH of the gut

  4. There is no specific reason
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Soil bacterium Bacillus thruingiensis (Bt) produces proteins that kill certain insects like lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).Bacillus thuringinesis forms some intracellular protein crystals. These crystals contain a toxic insecticidal protein. The Bt toxin protein exists as an inactive toxin and is coverted into an active form due to the alkaline pH of the alimentary canal that solubilities the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores which cause cell swelling and lysis and finally cause death of the insect.

So, the correct answer is 'Alkaline pH of the gut'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Which of the following is not used as a biopesticide?

  1. <p>Trichoderma harzianum</p>

  2. <p>Nucleopolyhedrovirus</p>

  3. <p>Xanthomonas campestris</p>

  4. <p> Bacillus thuringiensis</p>
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xanthomonas campestris is not used as a biopesticide. Bacillus thuringiensis is used as a microbial biocontrol agent. Trichoderma harzianum is a free-living fungi, common in soil and root ecosystems. It is an effective biocontrol agent of several plant pathogens. Viruses of the family Baculoviruses are pathogens that attack insects and other arthropods. The majority of baculoviruses used as biological control agents belong to genus Nucleopolyhedrovirus. So, the correct answer is 'Xanthomonas campestris'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Biopesticides are:

  1. The chemicals which are used to destroy the pests

  2. The living organisms or their products which are used for the pest control

  3. The organisms which destroy the crops

  4. None of these.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biopesticides are those biological agents or their products that are used for the control of weeds and insects (pathogens). A most important example is the soil bacterium, Bacillus thuringiensis.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Given below is the list of few chemicals that are used for protection of crops
i) dalapon 

ii) butachlor 
iii) malathion 
iv) simazine 
v) disyston 
vi) gammexane
How many of these are used as insecticides?

  1. 3

  2. 4

  3. 2

  4. 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Name of the compound  uses
 Dalapon It is used as a herbicide and acts on the perennial grasses. It controls the specific weed species and leaving the desired crops relatively unharmed.
 Butachlor It is used as a herbicide. It is mainly used in the form of granules in rice.
 Malathion It is used as an insecticide. It is basically used in mosquitoes eradication. 
 Simazine It is used as a herbicide. It is used to control broad-leaved weeds and annual grasses.
 Disulfoton It is used as an insecticide. It is effective against the sucking insects e.g. beet flies, 
 Gammexane It is used both as an agricultural insecticide and pharmaceutical purpose.

So, the correct answer is ' 3'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

A biological control which is effective biocontrol agent for several plant pathogens : 

  1. Nucleopolyhedrovirus

  2. Tirchoderma

  3. Agrobacterium

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

Trichoderma are fungi and present in the soil as avirulent symbionts.

Agrobacterium has a unique ability to transfer its DNA to the plants and hence it is manipulated by genetic engineering to make the crop pathogen resistance.
But the biocontrol agent for several plant pathogens is Nucleopolyhedrovirus. It is a virus that infects the pests like butterfly, moth, etc.
So the correct answer is ' Nucleopolyhedrovirus'. 

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Which of the following pairs is wrongly matched?

  1. Activated : Secondary treatment
  2. Gobar gas : ${ CH } _{ 4 }+{ CO } _{ 2 }$

  3. Biopesticide : Xanthomonas campestris

  4. Detergent formulations : Lipases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xanthomonas campestris is an aerobic, gram-negative rod known to cause the black in crucifers by darkening the vascular tissues. Host-associated, over 20 different pathovars of V.Campestris have been identified by their distinctive pathogenicity on a wide range of plants including crops and wild plants.

So, the correct option is 'Biopesticide: Xanthomous campestris'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Refer to the given dichotomous key and select the correct option.
I.   (a) Fibre obtained from natural sources - Go to II
     (b) Fibre obtained from chemical, - K
II.  (a) It is a cellulosic fibre - Go to III
     (b) It is a protein fibre. - Go to IV
III. (a) It is obtained from leaves. - L
     (b) It is obtained from seeds.
IV. (a) It is obtained from mammals. - N
     (b) It is obtained from an insect. - O

  1. Fabrics fibres K and N could be water proof.

  2. When fibres L and M are burnt separately they give smell of burning paper and burning hair, respectively.

  3. Fibre L is separated from leaves by retting process whereas from seeds by ginning process.

  4. N can be obtained from the same animal repeatedly whereas O can be obtained from source animal only once in its lifetime.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fabrics fibers K and N are usually laminated to or coated with a waterproofing material such as rubber, polyvinyl chloride (PVC), polyurethane (PU), silicone elastomer, fluoropolymers, and wax

So, the correct option is 'Fabrics fibers K and N could be waterproof'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Third generation pesticides are

  1. Pheromones

  2. Juvenile hormone analogues

  3. Insect repellents

  4. Pathogens
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The third generation pesticides are basically the modified forms of the insect hormones that show a great specificity to the pest or insect targetted. The juvenile hormone analogues such as methoprene, hydroprene and fenoxycarb do not kill the insect directly but prevent the development of their larvae. Gradually, they decrease the population of the insect as the adult insects will never be formed.

Hence, the correct answer is 'Juvenile hormone analogues'