Microbes in Human Welfare PYQs

What is the reason behind production of large holes in Swiss cheese?

Which one of the following is an example of non-distilled alcoholic beverage produced by yeast?

Streptokinase produced by bacterium Streptococcus is used for

Which of following organisms cannot fix nitrogen? A. Azotobacter B. Oscillatoria C. Anabaena D. Volvox E. Nostoc Choose the correct answer from the options given below:

Which are correct: A. Computed tomography and magnetic resonance imaging detect cancers of internal organs. B. Chemotherapeutics drugs are used to kill non-cancerous cells. C. α-interferon activate the cancer patients' immune system and helps in destroying the tumour. D. Chemotherapeutic drugs are biological response modifiers. E. In the case of leukaemia blood cell counts are decreased. Choose the correct answer from the options given below:

Which of the following microbes is NOT involved in the preparation of household products? A. Aspergillus niger B. Lactobacillus C. Trichoderma polysporum D. Saccharomyces cerevisiae E. Propionibacterium sharmanii Choose the correct answer from the options given below:

Match List I with List II Choose the correct answer from the options below:

Given below are two statements: Statement I : Bt toxins are insect group specific and coded by a gene cry IAc. Statement II : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. In the light of the above statements, choose the correct answer from the options given below:

Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of

Given below are two statements: Statement I: Electrostatic precipitator is most widely used in thermal power plant. Statement II: Electrostatic precipitator in thermal power plant removes ionising radiations. In the light of the above statements, choose the most appropriate answer from the options given below:

Which one of the following produces nitrogen fixing nodules on the roots of Alnus?

Breeding crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called:

Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A:

Match List-I with List-II: Choose the correct answer from the options given below.

Which of the following is not an objective of biofortification in crops?

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

Identify the wrong statement with reference to immunity.

By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams?

Match the following columns and select the correct option.

Select the option including all sexually transmitted diseases.

Which of the following statements about methanogens is not correct?

Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?

Which of the following bacteria reduce nitrate in soil into nitrogen?

A biocontrol agent to be a part of an integrated pest management should be :

Which of the following is correctly matched for the product produced by them?

Mycorrhizae are the example of

Select the mismatch:

Which of the following in sewage treatment removes suspended solids?

Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids?

Match Column-I with Column-II and select the correct option using the codes given below:

Choose the wrong statement:

Match the following list of microbes and their importance:

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:

Select the wrong statement:

Pollen tablets are available in the market for:

An alga which can be employed as food for human beings is:

What gases are produced in anaerobic sludge digesters?

A good producer of citric acid is

During sewage treatment, biogas is produced which include

In gobar gas, the maximum amount is that of:

Read the following four statements (A–D): (A) Colostrum is recommended for the new born because it is rich in antigens (B) Chikungunya is caused by a gram negative bacterium (C) Tissue culture has proved useful in obtaining virus-free plants (D) Beer is manufactured by distillation of fermented grape juice How many of the above statements are wrong?

The domestic sewage in large cities:

Bacillus thuringiensis forms protein crystals which contain insecticidal protein.

Read the following statement having two blanks (A and B): "A drug used for ______ (A) ______ patients is obtained from a species of the organism ______ (B) ______." The one correct option for the two blanks is:

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining are correct?

Select the correct combination of the statements (a-d) regarding the characteristics of certain organisms. (a) Methanogens are archaebacteria which produce methane in marshy areas. (b) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen. (c) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose. (d) Mycoplasma lack a cell wall and can survive without oxygen. The correct statements are :

Which one of the following is most appropriately defined?

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

Black (stem) rust of wheat is caused by :

An example of endomycorrhiza is :

Which one is the wrong pairing for the disease and its causal organism?

Which of the following is not used as a biopesticide?

The bacterium Bacillus thuringiensis is widely used in contemporary biology as:

Which one of the following pairs is wrongly matched?

Polyethylene glycol method is used for:

Nitrogen fixation in root nodules of Alnus is brought about by

Bacterial leaf blight of rice is caused by a species of

Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

Trichoderma harzianum has proved a useful microorganism for

Consider the following statements about biomedical technologies: (a) During open heart surgery blood is circulated in the heart-lung machine (b) Blockage in coronary arteries is removed by angiography (c) Computerised Axial Tomography (CAT) shows detailed internal structures as seen in a section of the body (d) X-ray provides clear and detailed images of organs like prostate glands and lungs Which two of the above statements are correct?

Which one of the following proved effective for biological control of nematodal disease in plants?

Consider the following four measures (a-d) that could be taken to successfully grow chick-pea in an area where bacterial blight disease is common: (a) Spray with Bordeaux mixture (b) Control of the insect vector of the disease pathogen (c) Use of only disease-free seeds (d) Use of varieties resistant to the disease Which two of the above measures can control the disease?

Differentiate between White rust and Brown rust (Give one important difference).

Curing of tea leaves is brought about by the activity of:

The world's highly prized wool yielding 'Pashmina' breed is:

For retting of jute, the fermenting microbe used is:

Three crops that contribute maximum to global food grain production are:

The name of Norman Borlaug is associated with:

Barophilic prokaryotes:

An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the:

Which of the following is not used for disinfection of drinking water?

All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia: