The bacteria Pseudomonas aeruginosa is useful because of its abil

Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one feature is common to leech, cockroach and scorpion

  • Nephridia

  • Cephalisation

  • Ventral nerve cord

  • Antenna


2.

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

  • nerve fibre is insulated by a medullary sheath

  • sodium pump starts operating only at the cyton and then continues into the nerve fibre

  • neurotransmitters are released by dendrites and not by axon endings

  • neurotransmitters are released by the axon endings and not by dendrites.


3.

The total number of nitrogenous bases in human genome is estimated to be about

  • 3.5 million

  • 35 thousand

  • 35 million

  • 3.1 billion.


4.

In which one of the following pairs the two items mean one and the same thing

  • Malleus - anvil

  • SA node - pacemaker

  • Leucocytes - lymphocytes

  • Haemophilia - blood cancer


Advertisement
5.

Which one of the following categories of organisms do not evolve oxygen during photosynthesis

  • Red algae

  • Photosynthetic bacteria

  • C4 plants with Kranz anatomy

  • Blue green algae


Advertisement

6.

The bacteria Pseudomonas aeruginosa is useful because of its ability to

  • transfer genes from one plant to another

  • decompose a variety of organic compounds

  • fix atmospheric nitrogen in the soil

  • produce a wide variety of antibiotics


B.

decompose a variety of organic compounds

Pseudomonas aeruginosa is a Gram-negative, aerobic rod belonging to the bacterial family Pseudomonadaceae. These bacteria are common inhabitants of soil water. They occur regularly on the surfaces of plants and occassionally on the surfaces of animals.

• The bacterium will grow in the absence of O2 if NO2 is available as a respiratory electron acceptor.
• They possesses the metabolic versatility. Organic growth factors are not required, and it can use more than thirty organic compounds for growth. Pseudomonas aeruginosa is often observed growing in "distilled water" which is evidence of its minimal nutritional requirements.
• It is able to grow at temperatures as high as 42 degrees.
• Its tolerance to a wide variety of physical conditions, including temperature, contributes to its ecological success and makes it suitable for decomposing a variety of organic compounds in varied environmental conditions.


Advertisement
7.

Pruning of plants promotes branching because the axillary buds get sensitized to

  • ethylene

  • gibberellin

  • cytokinin

  • indole acetic acid.


8.

The sugarcane plant has

  • dumb-bell shaped guard cells

  • pentamerous flowers

  • reticulate venation

  • capsular fruits.


Advertisement
9.

In Ulothrix meiosis takes place in

  • cells of the filament

  • holdfast

  • zygote

  • zoospores.


10.

In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through

  • aerenchyma

  • trichornes

  • pneumatophores

  • lenticels.


Advertisement