Tag: environmental protection

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Questions Related to environmental protection

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

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

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

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

Correct answer-A

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

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

  1. c and d

  2. a, c and d

  3. b, c and d

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

Statement (a) is correct as Spirulina is a protein-rich single-cell protein. Statement (b) is correct because Methylophilus methylotrophus has a high biomass production rate due to its rapid growth. Statement (c) is incorrect as mushrooms are not significant sources of vitamin C, and (d) is incorrect in this context.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

An earliest natural bioinsecticide of chinese origin is ________________.

  1. Rotenone from derris roots

  2. Azadirachtin from margosa leaves

  3. Pyrethrin from chrysanthemum

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

Rotenone, derived from Derris roots, has been used as a fish poison and insecticide in China for centuries, predating modern synthetic pesticides.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

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:

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'
Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

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

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

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Bt toxin kills insect by

  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
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 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.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

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

  1. (ii) and (iii)

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

  3. (iii) and (v)

  4. (iv) and (v).
Reveal answer Fill a bubble to check yourself
D Correct answer
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)'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

Bt toxin protein crystals present in bacterium Bacillus thuringiensis, do not kill the bacteria themselves because

  1. Bacteria are resistant to the toxin

  2. Toxins occor as inactive protoxins in bacteria

  3. Bacteria enclose toxins in a special sac

  4. None of these
Reveal answer Fill a bubble to check yourself
B 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 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 'Toxins occur as inactive protoxins in bacteria'.

Multiple choice zoology sustainable agriculture microbes and farming biopesticide environmental protection

The free-living fungus Trichoderma can be used for:

  1. killing insects

  2. biological control of plant diseases

  3. controlling butterfly caterpillars

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

Trichoderma species are free living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens like Fusarium, Phytopthora etc and used in the treatment of plant diseases.

So, the correct answer is 'biological control of plant diseases'