Intercalary meristem results in

The image of the pair of lines represented by $ax^2 + 2hxy + by^2 = 0$ by the line mirror $y = 0$ is

The diagram of a logic circuit is given below. The output $F$ of the circuit is represented by

Which of the following is a synthetic auxin?

Electrons ejected from the surface of a metal,when light of certain frequency is incident on it,are stopped fully by a retarding potential of $3 \ V$. Photoelectric effect in this metallic surface begins at a frequency $6 \times 10^{14} \ s^{-1}$. The frequency of the incident light in $s^{-1}$ is : [Planck's constant $= 6.4 \times 10^{-34} \ J \ s$,charge on the electron $= 1.6 \times 10^{-19} \ C$]

The oxidation state and covalency of $Al$ in $[AlCl(H_2O)_5]^{2+}$ are respectively