Question

A main component of NASA’s search for evidence of life on Mars is the identification of biosignatures. The most common of these indicative markers of extant or extinct life are carbonate minerals, which are formed when carbon dioxide in the atmosphere reacts with other minerals and liquid water. A widely held belief among astrobiologists is that proof of running or standing liquid water can be construed as diagnostic evidence of the existence of life. It has been established that a large portion of the red planet’s surface contains areas of frozen water, leading some scientists to theorize that the climate of ancient Mars was hotter and wetter than today, with a greenhouse-like atmosphere heavy with carbon dioxide. In this type of atmosphere, the existence of vast oceans similar to that of Earth would have been a very real possibility. Images of the landscape of Mars have lent support to these theories. But , perhaps, we are applying traditional criteria for diagnostic markers of life on Earth to another planet, and as new discoveries are teaching us, our understanding of life on our own planet is limited, and accordingly, so is our index of biosignatures. For example, microscopic life forms have recently been found in some of the most extreme temperatures and environments on our planet that scientists previously believed were completely inhospitable to the support of life. Evidence of rock-eating microbes has been discovered almost a mile beneath the ocean floor, and living in the seemingly dead deep-freeze of Antarctic ice. Such findings contradict the idea that a specified, delicate set of circumstances is necessary for the development and sustenance of life.

Your answer

READ THE ABOVE PASSAGE AND CHOOSE THE CORRECT OPTIONS FROM THE QUESTIONS GIVEN BELOW

1. Images of the landscape of Mars

1 point

support that the climate of ancient Mars was hotter and wetter than today

give evidence of rock-eating microbes

identifies biosignatures

support the possibility of oceans similar to that of Earth

none of these

2. The primary purpose of the passage is *

1 point

research for evidence of life on Mars

identification of biosignatures

to dispute the possibility of the existence of any life on Mars

emphasis on the need of understanding of life on Earth

none of these

3. According to the passage, which of the following statements is/are true for Mars?

1 point

large portion of the red planet’s surface contains areas of frozen water

the climate of ancient Mars was hotter and wetter than today

has oceans similar to that of Earth

I only

I and II

I and III

4. According to the passage, which of the following statement is NOT true?

1 point

Evidence of rock-eating microbes a mile beneath the ocean floor of the Earth

Life forms cannot be found in the most extreme temperatures

Carbonate minerals are the most common biosignatures

I only

II only

III only

I and II

II and III

5. Areas of frozen water on Mars leads to the believe

1 point

the existence of life on Mars

greenhouse-like atmosphere heavy with carbon dioxide

the possibility of biosignatures

proof of running or standing liquid water

none of these


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Answer 1

Answer:

what is your dream

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Answer 2

Bhai chhota chhota karke diya kro sab khichdi bna diye bhai aapne esko read karne me hi half hours chalaa jaayega


Some