Tag: zoology

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Questions Related to zoology

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Which of the following statements is correct with regard to biocontrol agents ?

  1. Ladybird and dragonflies are used to get rid of aphids and mosquitoes respectively.

  2. Bacillus thuringiensis bacteria are used to control butterfly caterpillars.

  3. Trichoderma species are used to control several plant pathogen.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Ladybird and dragonflies are used to get rid of aphids and mosquitoes respectively. Bacillus thuringiensis bacteria are used to control butterfly caterpillars. Trichoderma species are used to control several plant pathogen.. 
So, the correct option is 'All of these'
Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Statement 1 : Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
Statement 2 : Use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Biocontrol refers to the use of biological methods for controlling plant diseases and pests. Use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.
So, the correct option is 'Both statements 1 and 2 are correct'
Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Select the correct statement from the following 

  1. Flavobacterium is used to control 2,4-D

  2. Enterobacter aerogenes is used to control DDT

  3. Superbug is used to control oil spill

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • 2,4-Dichlorophenoxyacetic acid (2,4-D) is the third most commonly used herbicide all over the world.  The health hazards of 2,4-D to humans include that it may induce cytogenetic damage in human lymphocytes, irreversible eye damage, hepatotoxicity and nephrotoxicity. Many methods are proposed for treatment of chemical pollution, however, the safest and the cheapest one is the use of microorganisms for biodegradation of these pollutants. the most biologically active strains against 2,4-D proved to belong to the genera Pseudomonas, Achromobacter, Flavobacterium, Nocardia, Streptomyces and Aspergillus.
  • 1,1,1 -trichloro-2,2-bis (p-chlorophenyl)ethane (DDT) is one of the best synthetic pesticides. It was used to control mosquitoes spreading malaria, typhus and other insect-borne diseases among both military and civilian populations. After the war, DDT was made available for use as an agricultural insecticide. It was used extensively for the control of grass grub {Costelytra zealandica White). It was necessary to introduce microbes to degrade or control DDT in soil. It was done so by using DDT-degrading strain of E. aerogenes.
  • So all the above options are correct.
Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

The bacterium Bacillus thuringiensis is widely used in contemporary biology as

  1. Source of industrial enzyme

  2. Indicator of water pollution

  3. Insecticide

  4. Agent for production of dairy products
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacillus thuringiensis (Bt) produces toxins that are lethal to specific insect larvae, making it a common biological insecticide.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

The plant pesticide pyrethrum is obtained from

  1. Cinchona officinalis

  2. Chrysanthemum cinerariifolium

  3. Chrysophyllum cainito

  4. Cannabis sativa

  5. Cicer arietinum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyrethrum is a genus of plants which are cultivated as ornamentals. It is a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium. Pyrethroids are synthetic insecticides derived from natural Pyrethrum (pyrethrins). The compound enhances the effect of toxicity to insects. These compounds target the nervous system of the insects. They are commonly used as insect repellants. 

Thus, the correct answer is option B. 

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Integrated pest management (IPM) is also known as 

  1. Integrated parasite control

  2. Integrated pests control

  3. Integrated pests cure

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

Integrated pests management is a method which uses the natural agents like the microbes and insects to control the population of other harmful pests and insects. Thus, it is an integrated method for the control of the pests, insects, harmful disease causing agents, etc. The different methods to control pests are physical, biological, chemical, mechanical and cultural. 

Thus, the correct answer is option B. 

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Which of the following is a physical method of integrated pests management?

  1. Humidity

  2. Cold

  3. Conservation of native enemy population

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Integrated pests management is a method which uses the natural agents like the microbes and insects to control the population of other harmful pests and insects. The different methods to control pests are physical, biological, chemical, mechanical and cultural. The physical method involves controlling physical parameters like cold, high temperature, humidity, light, etc. Manipulation of these parameters help in controlling pests.

Thus, the correct answer is option D. 

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

The regulated use of synthetic pesticides at specific times in a pest's life cycle is evaluated under which of the following stage of IPM?

  1. Monitoring

  2. Responsible use

  3. Preventive cultural practices

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

Preventive cultural practices in IPM involve managing the environment to make it less favorable for pests, which includes timing activities to disrupt the pest life cycle.