Tag: natural cycles and resources

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Questions Related to natural cycles and resources

Multiple choice evs every drop counts natural cycles and resources water sources around us natural resources - air, water and land

 Which of the following is not a source of potable water?

  1. Well

  2. River

  3. Lake

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

Potable water means drinking water. Well, river and lake contain drinking water as these all contain either rainwater and groundwater which is suitable for drinking. The sea which contains salty water that is not suitable for drinking is not a source of potable water.

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

In batch fermentation:

  1. substrates are added to the system all at once and runs until product is harvested

  2. nutrients are continuously fed into the reactor and the product Is siphoned off during the run

  3. new batches of microorganisms are screened for increase yield

  4. small-scale production is used to synthesise product.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Fermentation is a metabolic process which converts carbohydrates to alcohols, organic acids are gases by the activity of the enzyme of microbial origin.
Batch fermentation is a process where the microorganism is inoculated into a fixed volume of medium. As the growth takes place the nutrients that are consumed and the product of growth keeps getting stored in the fermenter.
In batch fermentation, the mass production is done as separate batches. 
So, then the correct option is 'substrates are added to the system all at once and runs until product is harvested'
Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Penicillin inhibits bacterial multiplication because it

  1. Checks RNA synthesis

  2. Checks DNA synthesis

  3. Destroys chromatin

  4. Inhibits cell wall formation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibiotics are chemical substances, which are produced by some microbes and kill or retard the growth of other ( disease-causing ) microbes. Penicillin was the first antibiotic discovered. Penicillin inhibits bacterial growth by inhibiting cell wall formation, hence, killing the bacteria.

So, the correct answer is 'Inhibits cell wall formation'

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Read the following statements and select the correct option:
STATEMENT I: Nostoc and bacteria are prokaryotes.
STATEMENT II: Penicillium and Spirogyra are fungi.

  1. Only statement I is true

  2. Only statement II is true

  3. Both statements I and II are true

  4. Both statements I and III are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nostoc is a cyanobacterium. Along with bacteria, Nostoc belongs to the prokaryotic organisms as they do not possess the well-defined nucleus and double membrane-bound organelles. In statement 2, Penicillium is a fungus but Spirogyra is an alga. Thus, the correct option is A.

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Which of the following is the main function of antibiotic drugs in human body?

  1. Prevention of the growth of bacteria

  2. To control the level of oxygen

  3. To maintain the blood pressure

  4. To control sugar level in blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An antibiotic is a type of antimicrobial substance active against bacteria and is the most important type of antibacterial agent for fighting bacterial infections. Antibiotic medications are widely used in treatment and prevention. They have an important role in dental antibiotic prophylaxis where their use may prevent. So, the correct option is "A" (Prevention of the growth of bacteria).

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Which famous biologist showed in the middle of the nineteenth century that beer and butter milk are products of fermentation brought about by years?

  1. Ignaz Philipp Scmmelweiss

  2. Friedrich Hente

  3. Louis Pasteur

  4. Joseph Lister
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In 1857, Pasteur showed that lactic acid fermentation is caused by living organisms, In 1877, working to improve the French brewing industry, Pasteur published his famous paper on fermentation,"Studies on fermentation". He defined fermentation (incorrectly) as "Life without air",but correctly showed that specific types of microorganisms cause specific types of fermentations and specific end-products.

So,the correct option is C. (louis pasteur)