Question: 139: Match the List-I with List-II :
| List-I | List-II |
|---|---|
| (a) Carbon dissolved in oceans | (i) 55 billion tons |
| (b) Annual fixation of carbon through photosynthesis | (ii) 71 \% |
| (c) PAR captured by plants | (iii) 4 \times 10^{3} \mathrm{~kg} |
| (d) Productivity of oceans | (iv) 2 to 10 \% |
Choose the correct answer from the options given below :
(1) (a) – (ii), (b) – (iv), (c) – (iii), (d) – (i)
(2) (a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)
(3) (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)
(4) (a) – (iii), (b) – (ii), (c) – (i), (d) – (iv)
Answer: Option (3)
Explanation:
Oceans act as the largest reservoir of carbon on Earth.
About 71 \% of the total carbon present in the biosphere is dissolved in oceans,
so (a) matches with (ii).
The annual fixation of carbon through photosynthesis is approximately
4 \times 10^{3} \mathrm{~kg} per year, so (b) matches with (iii).
Only a small fraction of Photosynthetically Active Radiation (PAR) is captured by plants,
which is about 2 to 10 \%, so (c) matches with (iv).
The productivity of oceans is estimated to be around 55 billion tons annually,
so (d) matches with (i).
Therefore, the correct matching is (a)-(ii), (b)-(iii), (c)-(iv), and (d)-(i).