Explanation

HBV is Highly Contagious:

Transmitted through blood, semen, and other body fluids.

10 times more infectious than HCV and 50–100 times more infectious than HIV.

Can survive outside the body for up to 7 days, increasing transmission risk.

Explanation

Water makes up about 70% of the cell's composition.

It is crucial for various cellular processes, including biochemical reactions and maintaining cell structure.

Explanation

Antibodies are specialized proteins produced by the immune system.

They help identify and neutralize foreign substances like bacteria and viruses.

Explanation

The head of a chlorophyll molecule contains a porphyrin ring with a central magnesium (Mg) atom.

This ring has four nitrogen atoms that coordinate with the magnesium, forming a stable complex essential for photosynthesis.

Explanation

Communication skill is a learned behavior, not inherited genetically.

Skin colour, hair colour, and eye colour are inherited traits passed through genes.

Explanation

Binary fission is the simplest form of asexual reproduction, where an organism splits into two identical daughter cells.

It is commonly seen in single-celled organisms like bacteria.

Explanation

SO2 (Sulfur Dioxide) is a toxic gas that, when present in the air.

It can cause lung diseases.

It has been linked to an increased risk of cancer, including stone (kidney) cancer.

It is mainly produced by industrial processes and the burning of fossil fuels.

Explanation

CFCs (Chlorofluorocarbons) are not produced by vehicles.

They are primarily released from refrigerants and industrial processes.

CO2, NO2, and CO are all pollutants emitted by vehicle exhaust.

Explanation

Thalassemia is a genetic blood disorder caused by an abnormality in hemoglobin production.

It leads to reduced oxygen-carrying capacity of red blood cells.

Explanation

The two strands of DNA run in opposite directions (5' to 3' on one strand and 3' to 5' on the other).

This orientation is known as antiparallel.

It is crucial for proper DNA replication and function.