Assertion : None autotrophic bacteria carry out chemosynthesis.
Reason : Chemosynthesis bacteria trap the small amount of energy released from inorganic compound's oxidation to use in the reaction that synthesize carbohydrates.

Answer: dSolution: Chemosynthetic bacteria are without photosynthetic pigments. For the synthesis of their own organic food, (carbohydrates), they obtain carbon from $C{O}_2$ of the atmosphere, necessary energy from oxidation of inorganic or organic compounds, such as hydrogen sulphide $\left(H_{2}S\right)$, ferrous compounds $\left(F{e}^{2+}\right)$, molecular hydrogen $\left(H_2\right)$ ammonia $\left(N{H}_3\right)$ and nitrites $\left(N{O}_2^{-}\right)$