Explanation

A filament is a thin wire, typically made of tungsten, that is heated to produce a continuous flow of electrons.

When an electric current is passed through the filament, it heats up and releases electrons, creating a steady stream of electrons.

This principle is used in various devices such as vacuum tubes, cathode ray tubes (CRTs), and electron microscopes.

Explanation

A biome is a large region of the Earth's surface that is recognized by its specific climate, vegetation, and animal life.

Biomes are often defined by factors like temperature, precipitation, and geography, and they can be terrestrial (land-based) or aquatic (water-based).

Explanation

The head-to-tail rule is a method for adding vectors, such as forces, by lining up the head of one vector with the tail of the next vector.

This rule can be used to add any number of forces, not just two or three.

Explanation

The elements in group VIIA of the periodic table are called halogens.

This group consists of the following elements:

• Fluorine (F)
• Chlorine (Cl)
• Bromine (Br)
• Iodine (I)
• Astatine (At)
• Tennessine (Ts)

Explanation

In an open circulatory system, blood bathes the tissues directly, flowing through spaces among tissues, such as sinuses or lacunae. This type of circulation is found in:

• Invertebrates like insects, mollusks, and crustaceans
• Some lower vertebrates like fish and amphibians

Explanation

• The correct sequence of classifying an organism is: Kingdom → Phylum → Class → Order → Family → Genus → Species
• This sequence is known as the taxonomic hierarchy or Linnaean system, developed by Carl Linnaeus.
• It categorizes living things from most general (Kingdom) to most specific (Species).

Explanation

• A pollutant is a substance or energy that causes pollution.
• It is an undesirable change to the environment.

Explanation

Electronics comprises the:

• Physics: Study of electrons, semiconductors, and electronic behavior.
• Engineering: Design, development, and testing of electronic systems and devices.
• Technology: Application of electronic principles to create devices, circuits, and systems.

Explanation

The human eye acts like a Camera, capturing light and focusing it onto the retina to form an image.

The eye's lens, aperture, and retina work together to create a visual representation of the world, similar to a camera's mechanism.

Explanation

• CH3-OH is the molecular formula for methanol, which is an alcohol.

Key Points:

• CH3-CHO is the molecular formula for acetaldehyde, which is an aldehyde.
• CH3-CH2-O-CH3 is the molecular formula for diethyl ether, which is an ether.
• HCOOH is the molecular formula for formic acid, which is a carboxylic acid.