Questions

The required 7 letters word is SNOWING.

It becomes -

Sowing,

Swing,

Sing,

Sin,

In, and

I

when each letter is removed from it at a time.

Total number pages torn out are 3.

6,7 as one page

51,52 as one page

97,98 as one page

Biodegradable substances can be broken down into simpler, harmless substances in nature with due course of time by the biological process such as action of microbes. They can be recycled as a part of food chain.

Here, Leather bags are biodegradable.

A nitrogenous base, or nitrogen-containing base, is an organic molecule with a nitrogen atom that has the chemical properties of a base. The main biological function of a nitrogenous base is to bond nucleic acids together. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom.

In DNA, four bases have been found. They are

1. Adenine (A),

2. Guanine (G),

3. Cytosine (C) and

4. Thymine (T).

The first three of these bases are found in RNA also but the fourth which is Uracil (U) is absent in it.

RNA contains cytosine and uracil as pyrimidine bases while DNA has cytosine and thymine.

Antarctica is known as white continent because 98% of it's area is covered by ice throughout the year.