Describe Aufbau principle. Explain its significance in the electronic build up of atoms.

(a) Identify A, B, and D in the given diagram and write their names. (b) What is pollination? Explain its significance. (c) Explain the process of fertilization in flowers. Name the parts of the flower that develop after fertilization into (i) seed, (ii) fruit.

Using the a Aufbau principle, write the electronic configuration in the ground state of the following atoms : Boron (Z = 5 ) Neon (Z = 10) and Aluminium (Z = 13).

(i) An element has electronic configuration 2, 8, 6. Explain its position in the periodic table. (ii) Size of sodium atom is bigger than that of hydrogen atom. Why?

How are alleles of particular gene different? Explain its significance.

Draw a labelled diagram of an electric motor. Explain its principle and working . What is the function of a split ring in an electric motor?

Explain monohybrid test cross. Write its significance.

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the Modern Periodic Table and how valency of an element is calculated on the basis of its atomic number.