Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:

Which of the following statements are Correct? (a) Energy flow from producers to consumers is unidirectional (b) Energy pyramid can never be inverted (c) Transfer of energy follows the 1% law Choose the correct answer from the options given below :

Given below are two statements: Statement-I: $[Fe(ox)_{3}]^{3-}$ is chiral. Statement-II: trans-$[Cr(H_{2}O)_{2}(ox)_{2}]^{-}$ is chiral. (Given: $oxH_{2}=HOOC-COOH$) In light of the above statements, choose the most appropriate answer from the options given below:

A ray of light with wavelength $\lambda$ is incident on three different photoelectric cells namely 1, 2 and 3. The threshold wavelength of these photoelectric cells are $\lambda_{1}$, $\lambda_{2},$ and $\lambda_{3,}$ respectively and the magnitude of stopping potentials of these cells are $V_{1}$, $V_{2}$ and $V_{3},$ respectively. The relation between $\lambda$ and threshold wavelengths are $\lambda_{1}\lambda$ and $\lambda_{3}>>\lambda$. The correct option is:

Given below are two statements: Statement I: Chromosomes are fully condensed at the end of prophase I. Statement II: Meiosis I resembles mitosis. In the light of the above statements, choose the most appropriate answer from the options given below: