Explanation

Atmospheric pressure decreases as altitude increases.

As you go higher, the air pressure decreases because there are fewer air molecules above you, exerting less pressure.

This is why aircraft pilots must adjust their altimeters to account for changes in air pressure as they ascend or descend.

Explanation

Aeroplanes fly in the troposphere, which is the lowest layer of the Earth's atmosphere, extending up to about 12 km (7.5 miles) above the Earth's surface.

The troposphere is where weather occurs, and it's the layer where aircraft operate, typically cruising at altitudes between 30,000 to 40,000 feet (9,100 to 12,200 meters).

Explanation

Cotton is a natural fiber that contains a very high percentage of cellulose, typically around 95%.

Cellulose is a polysaccharide (a long chain of glucose molecules) that provides strength, structure, and durability to plant cell walls.

Cotton is one of the purest forms of cellulose, making it a valuable resource for textile production.

Explanation

Fats are typically solids at ordinary room temperature (around 20-25°C or 68-77°F).

However, they can melt and become liquids when heated to a higher temperature.

Explanation

A peptide is a molecule composed of two or more amino acids linked together through amide bonds.

It is a polyamide, meaning it is a polymer of amino acids.

Peptides are smaller than proteins, which are long chains of amino acids.

Explanation

Lactose, also known as milk sugar.

It is a disaccharide composed of galactose and glucose molecules.

It is found in milk and other dairy products.

Explanation

Starch is a polysaccharide, a long chain of glucose molecules linked together through glycosidic bonds.

It is a complex carbohydrate that serves as a energy storage molecule in plants.

Explanation

Amino acids are the building blocks of proteins, which are long chains of amino acids linked together by peptide bonds.

There are 20 different amino acids that the human body uses to build proteins.

They are essential for various cellular processes, including structure, function, and regulation.

Explanation

Aldoses are carbohydrates that contain an aldehyde group (-CHO) in their molecular structure.

The aldehyde group is a functional group that contains a carbon-oxygen double bond and a hydrogen atom.

Examples of aldoses include glucose, galactose, and ribose.

Explanation

DNA (Deoxyribonucleic acid) is the primary molecule that encodes genetic information in cells.

It is a long, double-stranded helix made up of nucleotides, which are the building blocks of genetic information.