Explanation

The liver typically weighs between 1400 to 1600 grams in healthy adult individuals.

It is the largest internal organ.

It plays vital roles in metabolism and detoxification.

Explanation

Cell wall is not a part of animal cells; it is found only in plant, fungal, and bacterial cells.

Animal cells have a cell membrane, cytoplasm, and vacuole (though smaller than in plant cells).

Explanation

The seed coat is called the testa.

It protects the seed from physical damage and prevents water loss.

Plumule is the young shoot.

Radicle is the young root that emerge from the seed during germination.

Explanation

Proper posture, avoiding heavy lifting, and stretching exercises help prevent back pain and injury.

These practices reduce strain on the spine and improve flexibility and strength.

Explanation

Smog is caused by pollutants like sulfur dioxide (SO₂) and nitrogen oxides (NOₓ), which are released from burning fossil fuels (coal, oil, and gas).

These pollutants react with sunlight to form ground-level ozone and particulate matter, leading to smog formation.

Explanation

Respiration is the process where oxygen is used to break down glucose, releasing energy (ATP) and producing carbon dioxide as a byproduct.

It occurs in the mitochondria.

It is essential for all living organisms.

Explanation

A screwdriver works on the wheel and axle principle, where the handle acts as a wheel, and the shaft acts as an axle to apply torque.

This mechanism helps in tightening or loosening screws efficiently.

Explanation

The distance traveled by a free-falling object can be calculated using the equation:

s = (1/2)gt²

where s is the distance, g is the acceleration due to gravity (approximately 9.8 m/s²), and t is the time.

Given t = 5 seconds:

s = (1/2) × 9.8 × 5²

s = (1/2) × 9.8 × 25

s = 122.5 m

Explanation

A point source of pollution is a single, identifiable source from which pollutants are discharged, such as a factory or industry.

Industries release waste directly into air or water from specific locations.

Explanation

Connective tissues include bone, blood, cartilage, and adipose (fat) — all of which support, bind, or transport substances in the body.

These tissues form the structural framework.

It play roles in protection, storage, and transportation of nutrients and oxygen.