McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Agriculture (BSc agri) .
Chapters
| 501. |
Which one of the following mineral elements play an important role in biological nitrogen fixation |
| A. | Copper |
| B. | Magnesium |
| C. | Zinc |
| D. | Molybdenum |
| Answer» D. Molybdenum | |
| 502. |
Rapid bacterial growth phase is known as |
| A. | Log |
| B. | Lag |
| C. | Lack |
| D. | None of these |
| Answer» A. Log | |
| 503. |
Clostridium welchii spore formation can be induced only on specified media such as |
| A. | Wilson-Blair medium |
| B. | Macconkey medium |
| C. | Ellner medium |
| D. | Thayee-Martion medium |
| Answer» C. Ellner medium | |
| 504. |
Mycotoxins are formed during the end of |
| A. | Lag phase |
| B. | Log phase |
| C. | Death phase |
| D. | Stationary phase |
| Answer» A. Lag phase | |
| 505. |
Bacteria which need oxygen for growth are called |
| A. | Thermophilic bacteria |
| B. | Microaerophilic bacteria |
| C. | Facultative anaerobic bacteria |
| D. | Mycobacteria |
| Answer» B. Microaerophilic bacteria | |
| 506. |
pH required for the growth of bacteria is |
| A. | 6.8 – 7.2 |
| B. | 5.6 – 8.2 |
| C. | 3.0 – 6.0 |
| D. | 8.0 – 14.0 |
| Answer» A. 6.8 – 7.2 | |
| 507. |
Drug resistance in bacteria is mainly determined by factor: |
| A. | F |
| B. | R |
| C. | Col |
| D. | Lysogenic factor |
| Answer» D. Lysogenic factor | |
| 508. |
The ion that is required in trace amounts for the growth of bacteria is |
| A. | Calcium |
| B. | Magnesium |
| C. | Cobalt |
| D. | Sodium |
| Answer» C. Cobalt | |
| 509. |
The most important vitamin for the growth of bacteria is |
| A. | B-complex |
| B. | Vitamin A |
| C. | Vitamin D |
| D. | Vitamin C |
| Answer» A. B-complex | |
| 510. |
The principle in microbiological assays is |
| A. | At certain range the concentration of growth factor will bear a linear relationship to the amount of nutrients added |
| B. | Concentration of growth factor have a linear relationship with the growth of the organism |
| C. | Both a and b |
| D. | None of the above |
| Answer» B. Concentration of growth factor have a linear relationship with the growth of the organism | |
| 511. |
If the source of energy for bacteria is from chemical compounds they are said to be |
| A. | Phototrophs |
| B. | Autotrophs |
| C. | Chemotrophs |
| D. | Chemolithotroph |
| Answer» C. Chemotrophs | |
| 512. |
In the synthesis of cell components the major element required is |
| A. | Nitrogen |
| B. | Sulphur |
| C. | Carbon |
| D. | Oxygen |
| Answer» C. Carbon | |
| 513. |
For the formation of cell-components the elements required are |
| A. | Nitrogen |
| B. | Oxygen |
| C. | Sulphur |
| D. | All of these |
| Answer» D. All of these | |
| 514. |
For the synthesis of amino acids cysteine, cystine and methionine the element required is |
| A. | Sulphur |
| B. | Oxygen |
| C. | Nitrogen |
| D. | None of these |
| Answer» D. None of these | |
| 515. |
Sulphur can be utilized by bacteria in the form of |
| A. | Organic compounds |
| B. | Inorganic compounds |
| C. | Elemental compounds |
| D. | All of the above |
| Answer» A. Organic compounds | |
| 516. |
Phosphorous is an essential component of |
| A. | Nucleotides |
| B. | Nucleic acids |
| C. | Phospholipids and Heichoic acids |
| D. | All the above |
| Answer» D. All the above | |
| 517. |
Trace elements are |
| A. | Zn+2, Cu+2, Mn+2 |
| B. | MO6+, Ni2+, B3+ and CO2+ |
| C. | Both a and b |
| D. | None of these |
| Answer» D. None of these | |
| 518. |
Most bacteria do not require the ion |
| A. | Mg2+ |
| B. | Ca2+ |
| C. | Na+ |
| D. | Fe+2 |
| Answer» C. Na+ | |
| 519. |
Vitamin function as |
| A. | Co-enzymes |
| B. | Co-melecules |
| C. | Building blocks of cell |
| D. | None of these |
| Answer» C. Building blocks of cell | |
| 520. |
The vitamin required for Lactobacillus species is |
| A. | Riboflavin |
| B. | Niacin |
| C. | Pyridoxine |
| D. | Folic acid |
| Answer» B. Niacin | |
| 521. |
Vitamin K is necessary for the species |
| A. | Lactobacillus spp. |
| B. | Bacillus anthracis |
| C. | Bacteroides melaninogenicus |
| D. | All of these |
| Answer» A. Lactobacillus spp. | |
| 522. |
The bacteria which are able to grow at 0°C but which grow at 20°C to 30°C, are known as |
| A. | Psychrophiles |
| B. | Facultative psychrophiles |
| C. | Average psychrophiles |
| D. | Mesophiles |
| Answer» C. Average psychrophiles | |
| 523. |
Radical shifts can be prevented by adding |
| A. | Acid |
| B. | Alkali |
| C. | Buffer |
| D. | None of these |
| Answer» C. Buffer | |
| 524. |
The orderly increase in the quantity of all the cellular components is known as |
| A. | Reproduction |
| B. | Growth |
| C. | Binary fission |
| D. | None of these |
| Answer» B. Growth | |
| 525. |
The most common mode of cell division in bacteria is |
| A. | Binary fission |
| B. | Transverse binary fission |
| C. | Longitudinal binary fission |
| D. | None of these |
| Answer» C. Longitudinal binary fission | |
| 526. |
How much time a bacterium take for the complete duplication? |
| A. | 30 min. |
| B. | 10 min. |
| C. | 20 min. |
| D. | 25 min. |
| Answer» C. 20 min. | |
| 527. |
The generation time is |
| A. | The time required for the cell to divide |
| B. | The total division of the cell during its life time |
| C. | The total no.of cells formed |
| D. | None of these |
| Answer» C. The total no.of cells formed | |
| 528. |
In bacteria, the increase in population is in the manner |
| A. | Geometric progression |
| B. | Multiplication |
| C. | Doubling |
| D. | None of these |
| Answer» A. Geometric progression | |
| 529. |
Physiologically the cells are active and are synthesizing new protoplasm in which stage of the growth in bacteria |
| A. | Log phase |
| B. | Lag phase |
| C. | Stationary phase |
| D. | None of these |
| Answer» C. Stationary phase | |
| 530. |
The most active stage in the sigmoid curve of bacteria in which maximum growth is attained |
| A. | Lag phase |
| B. | Stationary phase |
| C. | Decline phase |
| D. | Log phase |
| Answer» D. Log phase | |
| 531. |
Log-phase is also known as |
| A. | Death phase |
| B. | Exponential phase |
| C. | Lag-phase |
| D. | None |
| Answer» C. Lag-phase | |
| 532. |
The no. of generations per hour in a bacteria is |
| A. | Growth rate |
| B. | Generation time |
| C. | Sigmoid curve |
| D. | None of these |
| Answer» B. Generation time | |
| 533. |
In the sigmoid curve (or) growth curve of bacteria how many stages are there |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 5 |
| Answer» B. 4 | |
| 534. |
The reproduction rate is equal to death rate in which stage |
| A. | Decline phase |
| B. | Stationary phase |
| C. | Lag phase |
| D. | Log phase |
| Answer» D. Log phase | |
| 535. |
Minimum growth temperature is |
| A. | The growth of organisms at lowest temperature |
| B. | The lowest temperature at which the microorganisms grow |
| C. | The maximum temperature at which the growth is stable |
| D. | None of these |
| Answer» B. The lowest temperature at which the microorganisms grow | |
| 536. |
Optimum growth temperature is greater that 45oC is |
| A. | Mesophile |
| B. | Thermophiles |
| C. | Psychrophiles |
| D. | None of these |
| Answer» A. Mesophile | |
| 537. |
The organisms which can grow both in presence and absence of oxygen |
| A. | Aerobes |
| B. | Anaerobes |
| C. | Faculative anaerobes |
| D. | Strict aerobes |
| Answer» C. Faculative anaerobes | |
| Explanation: Facultative anaerobes are organisms that can grow and thrive in both the presence and absence of oxygen. They have the ability to use oxygen for aerobic respiration when it's available, but can also switch to anaerobic respiration or fermentation when oxygen is absent. This adaptability allows them to survive in a wide range of environments. | |
| 538. |
The organisms which can grow best in the presence of a low concentration of oxygen |
| A. | Aerophilic |
| B. | Microaerophilic |
| C. | Aerobic |
| D. | Anaerobic |
| Answer» B. Microaerophilic | |
| 539. |
The compound that is added to the medium to absorb oxygen for the creation of anaerobic conditions |
| A. | Sodium Thioglycollate |
| B. | Nitrous acid |
| C. | Citrate |
| D. | None of these |
| Answer» B. Nitrous acid | |
| 540. |
The utilization of light energy to drive the synthesis of ATP is called as |
| A. | Photolysis |
| B. | Photophosphorylation |
| C. | Photosynthesis |
| D. | Respiration |
| Answer» C. Photosynthesis | |
| 541. |
During cyclic phosphorylation NADP is formed or not. |
| A. | No NADP formation |
| B. | No NADP utilization |
| C. | NADP is converted into NADPH |
| D. | All are correct |
| Answer» A. No NADP formation | |
| 542. |
Cyclic phosphorylation is generally present in |
| A. | Cyanobacteria |
| B. | Algae |
| C. | Bacteria |
| D. | Plants |
| Answer» A. Cyanobacteria | |
| 543. |
Non-cyclic photophosphorylation is also known as |
| A. | Oxygenic photosynthesis |
| B. | Photosynthesis |
| C. | Anoxygenic photosynthesis |
| D. | Photophosphorylation |
| Answer» B. Photosynthesis | |
| 544. |
The number of ATP molecules formed during cyclic phosphorylation are |
| A. | One |
| B. | Two |
| C. | Four |
| D. | Six |
| Answer» D. Six | |
| 545. |
Artificial transformation in laboratory is carried out by treating the cells with |
| A. | MgCl2 |
| B. | Cacl2 |
| C. | NaCl |
| D. | HCl |
| Answer» B. Cacl2 | |
| 546. |
The process of formation of mesozygote is called |
| A. | Meromixi |
| B. | Exozygote |
| C. | Mitosis |
| D. | Meiosis |
| Answer» A. Meromixi | |
| 547. |
Wh ich of the fo l low ing organ isms requires tryptophan for growth? |
| A. | H.influenza |
| B. | Vibrio |
| C. | Gonococci |
| D. | S.typhi |
| Answer» D. S.typhi | |
| 548. |
Tubercular bacilli grow best in |
| A. | Absence of O2 |
| B. | Presence of CO2 |
| C. | Presence of O2 |
| D. | None of these |
| Answer» B. Presence of CO2 | |
| 549. |
Growth curve does not include following phases of bacteria – |
| A. | Decline phase |
| B. | Stationary phase |
| C. | Lag phase |
| D. | Synchronous growth |
| Answer» D. Synchronous growth | |
| 550. |
Bacteria are more sensitive to antibiotics at which phase of growth curve? |
| A. | Decline phase |
| B. | Stationary phase |
| C. | Lag phase |
| D. | Log phase |
| Answer» D. Log phase | |
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