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Choose the true state1nents from the fol...

Choose the true state1nents from the follovving: l. Birbal Sahni is called 'Father of lndian Palaeobotany .
II. Pseudo-fossils are re.mains of plants and anjmals.
III. `C_(11)` radioactive carbon method is used for dating not only for fossils, but also for archaeological remains
IV. Coenozoic era is called 'nge of m,.unmals and birds'

A

I and III

B

Only III

C

I, III and IV

D

II, III and IV

Text Solution

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The correct Answer is:
C
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Several short-lived radioactive species have been used to determine the age of wood or animal fossils. One of the most intresting substance is ""_(6)C""^(14) (half-life fossils, etc.). Carbon-14 is produced by the bombardment of nitrogen atoms present in the upper atmosphere with neutrons (from cosmic rays). ""_(7)N""^(14)+""_(0)n""^(1)to""_(6)C""^(14)+""_(1)H""_(1) Thus carbon-14 is oxidised, to CO""_(2) and eventually lingested by land animals. The death of plants or animals put an end to the intake of C""_(14) from the atmosphere. After this the amount of C""_(14) in the dead tissues starts decreasing due to its disintegration as per the following reaction : ""_(6)C""^(14)to""_(7)N""^(14)+""_(-1)beta""^(0) The C""^(14) isotope enters the biosphjere when carbon dioxide is taken up in plant photosynthesis. Plants are eaten by animals, which exhale C""^(14) as CO""_(2) . Eventually, C""^(14) participates in many aspects of carbon cycle. The C""^(14) lost by radioactive decay-replenishment process, a dynamic rquillibrium is established whereby the ratio of C""^(14) to C""^(12) remains constant in living matter. But when an individual plant or an animal dies, the C""^(14) isotpe inn it is no longer replenished, so the ratio decreases as C""^(14) decays. So, ther number C""^(14) nuclei after time t (after the death of living matter) would be less than in a livingthe following formula, t""_(1//2)=0.693 /? The intensity of the cosmic rays have remain the same for 30,000 years. But since some years changes in this are observed due to excessive burning of fossil fuel and nuclear test? Why do we use the carbon dating to calculate the age of the fossil?

Read the given passage carefully and answer the questions that follow. Certain words are printed in bold to help you locate them while answering some of these. Renewable Energy (RE) is the future. With that said, one can argue that the future has arrived, in parts at least. Worldwide acceptance towards green energy is giving the sustainable energy sector more market share every year. The growth is consistent, with each year out-performing the previous, leading renewable energy to account for 1/3rd of global energy capacity. It’s fair to state that the growth trajectory is incredible, and considering that it took only a little more than a just decade to reach this position, we could call it _____________. However, the most important question is, is this satisfactory? The goal of green energy transition is to solve growing energy scarcity and reduce dependency on fossil fuels in order to move towards a fully sustainable energy landscape. Therefore, to identify success, we need to compare renewable energy growth with the current scenario. According to WHO’s estimates, currently, more than 7 million people die every year from pollution, up from 4.2 million in 2016. Fossil fuel consumption has increased globally from 94,462/twh in 2000 to 1,33,853/twh now. The rise in population (currently 7.7 billion) indicates a steady growth in energy demand worldwide. In comparison, the fact that renewable energy took a decade to become 1/3 of energy capacity is not the ideal pace, considering we might not have two more decades to wait for RE to catch up. Which of the following statement (s) if true, will support the author’s claim that the rate of growth in Renewable Energy is not satisfactory? I. The use of fossil fuels to satisfy energy needs continues to be a popular choice. II. The issue of energy scarcity is being addressed by the use of RE in a more appropriate manner. III. Government and private organisations are working together to develop technology which operates on RE.

Read the given passage carefully and answer the questions that follow. Certain words are printed in bold to help you locate them while answering some of these. Renewable Energy (RE) is the future. With that said, one can argue that the future has arrived, in parts at least. Worldwide acceptance towards green energy is giving the sustainable energy sector more market share every year. The growth is consistent, with each year out-performing the previous, leading renewable energy to account for 1/3rd of global energy capacity. It’s fair to state that the growth trajectory is incredible, and considering that it took only a little more than a just decade to reach this position, we could call it _____________. However, the most important question is, is this satisfactory? The goal of green energy transition is to solve growing energy scarcity and reduce dependency on fossil fuels in order to move towards a fully sustainable energy landscape. Therefore, to identify success, we need to compare renewable energy growth with the current scenario. According to WHO’s estimates, currently, more than 7 million people die every year from pollution, up from 4.2 million in 2016. Fossil fuel consumption has increased globally from 94,462/twh in 2000 to 1,33,853/twh now. The rise in population (currently 7.7 billion) indicates a steady growth in energy demand worldwide. In comparison, the fact that renewable energy took a decade to become 1/3 of energy capacity is not the ideal pace, considering we might not have two more decades to wait for RE to catch up. Which of the following is NOT true with respect to the context of the passage? I. Deaths due to increased pollution level have escalated in the past few years. II. Though the rate of growth in RE is less than required, it has been consistent. III. More market share allotment to green energy has given RE a worldwide acceptance.

ARIHANT NEET-EVIDENCES OF EVOLUTION-Chapter exercises (Medical entrances special format questions )(Statement based questions)
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  10. Assertion : Homologous organs have common ancestry and similar functio...

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  14. Assertion : Comparative biochemistry provides a strong eviednce in fav...

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