Explanation

Nitrogen dioxide (NO₂) and Sulphur dioxide (SO₂) dissolve in rainwater to form nitric acid and sulphuric acid, causing acid rain.

These gases are mainly released from burning fossil fuels.

Explanation

Acids are not slippery; instead, they usually have a sour taste and can be corrosive.

Bases are the ones that feel slippery to touch.

Explanation

Rose petals act as a natural pH indicator.

They turn blue in alkaline (basic) solutions due to pigment changes.

Explanation

The auditory nerve (also called the cochlear nerve) transmits sound signals from the ear to the brain.

It plays a direct role in the sense of hearing.

Explanation

Centrioles are typically found in animal cells, not in most plant cells.

Plant cells do have chloroplasts, mitochondria, and a cell membrane.

Explanation

• The male reproductive part of a flower is called the Stamen.

It consists of two parts:

1. Anther (produces pollen grains)
2. Filament (supports the anther)

Explanation

Snails are mollusks, belonging to the phylum Mollusca.

They typically have a soft body and, in many cases, an external shell.

Explanation

When the left ventricle contracts, it pumps oxygenated blood into the aorta.

This blood is then distributed to the entire body through systemic circulation.

Explanation

The refractive index of ice is approximately 1.31, which is slightly less than that of water (1.33).

This means light travels a bit faster in ice than in liquid water.

Explanation

Cartography is the science and art of creating maps to represent geographical areas.

It includes designing, drawing, and interpreting maps for navigation and study.