Question
In fern, spores are formed in
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| Column $-I$ | Column $-II$ |
| $(A)$ Ketone | $(p)$ has $5$ carbon sugar, a phospphate group and a nitrogenous base |
| $(B)$ Fatty acid | $(q)$ has long chain of carbon and hydrogen atoms and a carboxyl group at one end |
| $(C)$ Aldehyde | $(r)$ has a carbonyl group at the end of the carbon chain |
| $(D)$ Nucleotide | $(s)$ has a carbonyl group within the carbon chain |
Reason $(R):$ Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.
In the light of the above statements, choose the correct answer from the options given below.