Tag: natural cycles and resources
Questions Related to natural cycles and resources
Which of the following is not a source of potable water?
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Well
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River
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Lake
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Sea
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.
The water cycle is driven by the:
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moon
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sun
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oceans
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clouds
The water cycle is driven by the sun.
The water in the oceans and seas has many ______ dissolved in its.
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bases
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iron
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acids
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salts
The water in the oceans and seas has many salts dissolved in it. The most abundant ions in sea water are $Cl^-, Na^+. SO _4^{2-}, Mg^{2+}, K^+$.
Well water is an example of surface water.
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True
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False
True. Well water is an example of surface water because it appears on the surface and it is not ground water.
Which of the following is correct?
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Ocean water is fit for agricultural and industrial needs
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Oceans play an important role in supplying the water that we use
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Ocean water is not saline
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None of the above
Option B is correct.
In batch fermentation:
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substrates are added to the system all at once and runs until product is harvested
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nutrients are continuously fed into the reactor and the product Is siphoned off during the run
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new batches of microorganisms are screened for increase yield
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small-scale production is used to synthesise product.
Penicillin inhibits bacterial multiplication because it
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Checks RNA synthesis
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Checks DNA synthesis
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Destroys chromatin
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Inhibits cell wall formation
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.
Read the following statements and select the correct option:
STATEMENT I: Nostoc and bacteria are prokaryotes.
STATEMENT II: Penicillium and Spirogyra are fungi.
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Only statement I is true
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Only statement II is true
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Both statements I and II are true
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Both statements I and III are false
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.
Which of the following is the main function of antibiotic drugs in human body?
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Prevention of the growth of bacteria
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To control the level of oxygen
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To maintain the blood pressure
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To control sugar level in blood
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).
Which famous biologist showed in the middle of the nineteenth century that beer and butter milk are products of fermentation brought about by years?
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Ignaz Philipp Scmmelweiss
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Friedrich Hente
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Louis Pasteur
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Joseph Lister
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.