Tag: zoology

Questions Related to zoology

Which of these methods is not a part of environmental pest control?

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Intercropping

  2. Introducing predators or parasites

  3. Plant trap crops

  4. Sterile male technique

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Correct Option: D

The majority of Baculoviruses are used as biological control agents as.

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. They are species - specific

  2. They have no negative impact on nontargets

  3. Beneficial insects are being conserved

  4. All the above

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Correct Option: D
Explanation:

Baculoviruses are used as biological control agents and in intrinsic farming because of all these above characteristics.

Correct answer-D

Identify the set which has all organisms used in biological control of pests.

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Trichoderma, Nucleopolyhedro virus, Bacillus thuringiensis, Lady Bird (Lady Bug) beetle

  2. Dragon flies, Bacillus thuringiensis, Lady Bird, Aphids

  3. Lady Birds, Penicillium, Baculovirus, Aspergillus

  4. Trichoderma, Aspergillus, Bacillus thuringiensis, Nucleopolyhedro virus

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Correct Option: A
Explanation:

Trichoderma,Nucleopolyhedro virus,Bacillus thuringiensis,Lady Bird beetle are all used as biopesticides.

Correct answer-A

Which is not a mycoherbicide?

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Phytophthora palmivora

  2. Xanthomonas spp

  3. Alternaria crassa

  4. Fusarium spp

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Correct Option: B

Select the correct statements out of (a - d)
(a) Single celled Spirulina can produce large quantities of food rich in protein, minerals and vitamins
(b) Body weight-wise the microorganism Methyliphilus methylotrophus produces several times more protein than a cow per day
(c) Button Mushroom is a rich source of vitamin C
(d) A rice variety has been developed which is very rich in calcium

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. c and d

  2. a, c and d

  3. b, c and d

  4. a and b.

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Correct Option: D

An earliest natural bioinsecticide of chinese origin is ________________.

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Rotenone from derris roots

  2. Azadirachtin from margosa leaves

  3. Pyrethrin from chrysanthemum

  4. None of the above

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Correct Option: A

Match the items in column 'A' and column 'B' and choose correct answer. 

 Column A  Column B
(i) Lady bird  (A) Methanobacterium
(ii) Mycorrhiza (B) Trichodema
(iii) Biological control  (C)  Aphids
(iv) Biogas (D) Glomus 

The correct answer is:

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. (i)-B (ii)- D (iii)-C (iv)-A

  2. (i)-C (ii)- D (iii)-B (iv)-A

  3. (i)-D (ii)-A (iii)-B (iv)-C

  4. (i)-C (ii)-B (iii)-A (iv)-D

Show answer
Correct Option: B
Explanation:
Lady bird beetle function as a biological controlling agent against Aphids. Glomus is a genus of arbuscular mycorrhizal fungi and it form symbiotic relationship with plant roots which is called mycorrhiza. Tricoderma is used as a biological controlling agent against pathogenic fungi belonging to various genera. Methanobacterium produce methane which is the main component of Biogas.
So, the correct option is '(I)-C, (ii)-D, (iii)-B, (iv)-A'

Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein 

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Binds with epithelial cells of mid gut of the insect pest ultimately killing it

  2. Is activated by acidic pH of the gut of the insect pest

  3. Does not kill the carrier bacterium which is itself resistant to this toxin

  4. All of the above

Show answer
Correct Option: A
Explanation:

Soil bacterium Bacillus thruingiensis (Bt) produces proteins that kill certain insects like lepidopterans (tobacco dudworm, armyworm), coleopterans (beetals) and dipterans (files, mosquitoes).Bacillus thuringinesis forms some intracellular protein crystals. These crystals contain a toxic insecticidal protein. The Bt toxin protein exists as 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 create pores which cause cell swelling and lysis and finally cause death of the insect.

So, the correct answer is 'Binds with epithelial cells of midgut of the insect pest ultimately killing it'

Bt toxin kills insect by

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. Inhibiting protein synthesis

  2. Generating excessive heat

  3. Creating pores in the midgut epithelial cells, leading to cell swelling and lysis

  4. Obstructing a biosynthetic pathway

Show answer
Correct Option: C
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 converted 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 the death of the insect.

So, the correct answer is 'Creating pores in the midgut epithelial cells, leading to cell swelling and lysis.

Bt toxin genes have been expressed in plants in order to provide resistance against
(i) Lepidopterans and fungi
(ii) Animals and bacteria
(iii) Bacteria and fungi
(iv) Coleopterance and dipterans
(v) Lepidopterans

zoology sustainable agriculture microbes and farming biopesticide environmental protection

  1. (ii) and (iii)

  2. (i), (ii) and (iv)

  3. (iii) and (v)

  4. (iv) and (v).

Show answer
Correct Option: D
Explanation:

Soil bacterium Bacillus thruingiensis (Bt) produces proteins that kill certain insects like lepidopterans (tobacco dudworm, 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 converted 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 the death of the insect.

So, the correct answer is '(iv) and (v)'.