Explanation

Insulators are materials that resist the flow of heat (and also electricity), such as wood, rubber, or plastic.

They are used to prevent heat loss or protect from heat transfer.

Explanation

The correct order of planets starting from the closest to the Sun is Mercury, Venus, Earth, and Mars.

Mercury is the closest, followed by Venus, Earth, and then Mars.

Explanation

• Red (R) Green (G) and blue (B) colors are known as primary colors of light.
• Because of mixing these three colors we are able to make all possible colors.

Key Point

The primary colors of Pigment is:

• Red
• Yellow
• Blue

Explanation

An anion is a negatively charged ion.

H⁻ (hydride ion) carries a negative charge, so it is an anion.

Explanation

Sodium chloride (NaCl) dissolves in water because it is an ionic compound that dissociates into ions.

Water molecules surround and separate the sodium and chloride ions, allowing it to dissolve.

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

The spinal cord controls movement by transmitting signals between the brain and body; damage can cause paralysis.

The severity depends on the injury location, but mobility loss is a common result.

Explanation

Phytoplankton are microscopic plants that perform photosynthesis and form the base of the marine food chain.

They provide energy for small marine animals, which are then eaten by larger predators.

Explanation

Androecium is the collective term for the male reproductive parts of a flower, called stamens.

Each stamen typically consists of an anther (pollen-producing) and a filament.

Explanation

Xylem transports water and dissolved mineral salts upward from the roots to the leaves.

It plays a key role in plant hydration and nutrient distribution for photosynthesis.