Explanation

The Kelvin scale is related to Celsius by: K = °C + 273.15.

Thus, 0°C = 273.15 K, which is the absolute temperature reference point.

Explanation

Curie (Ci) is a unit that measures the rate of radioactive decay.

1 Curie = 3.7 × 10¹⁰ disintegrations per second.

Explanation

PVC (Polyvinyl chloride) is a synthetic polymer made from repeating vinyl chloride monomers.

CH₄, SO₂, and CO₂ are simple molecules, not polymers.

Explanation

Salt (solute) dissolves in water (solvent) to form a homogeneous mixture called a solution.

The salt ions spread evenly throughout the water, making it uniform.

Explanation

Calcium carbonate + hydrochloric acid → calcium chloride (CaCl₂), water (H₂O), and carbon dioxide (CO₂).

This is a neutralization + decomposition type reaction of an acid with a carbonate.

Explanation

Viscosity means resistance to flow; lower viscosity = flows more easily.

Acetone is less viscous than water, glycerine, and ethyl alcohol, so it flows fastest.

Explanation

Argon is a noble (inert) gas found in Group 18 of the periodic table; it is chemically unreactive.

H₂ and O₂ are reactive gases.

Explanation

Phototropism is the directional growth of plants in response to light.

Example: Shoots bend toward light to maximize photosynthesis.

Explanation

In plants, xylem mainly transports water and minerals upward.

Phloem carries organic food and minerals both upward and downward, enabling downward translocation.

Explanation

The cell is the smallest unit of life.

Cells are called ‘structural’ and ‘functional’ units for a reason.

Cells are made of molecules which are in turn made up of atoms.

“Cell is the unit of LIFE” is that a cell is the smallest living entity in a living system.