Questions

Data is organized in the form of row and columns, thus it is in tabular structure.

A chromatid is one copy of a newly copied chromosome which is still joined to the original chromosome by a single centromere.

The two identical copies—each forming one half of the replicated chromosome are called chromatids.

Chromonema is the fibre-like structure in prophase in the primary stage of DNA condensation. In metaphase, they are called chromatids.

A redox reaction is a type of reaction which involves transfer of electrons among two species. This reaction is also called oxidation-reduction reaction.

In oxidation process, there is an increase in oxidation state of an atom, ion or molecule by losing the electrons.

In reduction process, there is a decrease in oxidation state of an atom, ion or molecule by accepting the electrons.

1)

In this reaction, Ba undergoes oxidation and Cl undergoes reduction.
This reaction is redox reaction.
In this reaction, oxidation number of Ba increases from 0 to +2 . So, Ba undergoes oxidation. The oxidation number of Cl decreases from 0 to -1. So, Cl undergoes reduction.

2) 

From this above reaction, it is clear that Aluminum undergoes oxidation and silver undergoes reduction.
Due to this, this reaction is redox reaction.

In this reaction, oxidation number of Aluminum increases from 0 to +1. So, aluminum undergoes oxidation. The oxidation number of silver decreases from +1 to 0. So, silver undergoes reduction.

3)

In this reaction, Mg undergoes oxidation and Br undergoes reduction.
This reaction is redox reaction.
The reactions 1, 3 and 4 are redox reactions.
In this reaction, oxidation number of Mg increases from 0 to +2 . So, Mg undergoes oxidation. The oxidation number of Br decreases from 0 to -1 . So, Br undergoes reduction.

Hence all the above reactions are redox reactions.

Chemically marble is known as Calcareous rock as it is composed of carbonate minerals like calcite or dolomite.

A voting machine is a machine used to register and tabulate votes.

In the given options, It was invented in 1898 is the false statement as it was actually invented in 1875 with some faults in it.

The Planning Commission was an institution in the Government of India started by Jawaharlal Nehru, The First Prime Minister of Independent India, in the year 1950. Later, this was replaced by NITI Aayog in 2015 by now and than Prime Minister Narendra Modi to ensure implementation of the Sustainable Development Goals by fostering the involvement of State Governments of India in the economic policy-making process.

NITI Aayog means National Institute for Transforming India. Narendra Modi is the Chairman of NITI Aayog.