FPSC MCQs

Water enters the cell and enlarges the vacuole.
The cell contents press against the wall, making the cell turgid.

Tissues consist of coordinated cells with related roles.
Examples include muscle tissue and epithelial tissue.

Microorganisms use sugars during fermentation.
The process is used in bread, yogurt, and other foods.

Organs combine multiple tissue types for specific functions.
The heart and lungs are examples.

In graphite, each carbon forms three bonds and leaves mobile electrons.
These electrons carry charge along the layers.

Diamond and graphite are allotropes of carbon.
Their different structures give very different properties.

Each carbon atom bonds strongly to four others in diamond.
The rigid network resists deformation.

Chlorine in controlled amounts disinfects water.
It reduces disease-causing bacteria and viruses.

Polymers consist of repeating monomer units.
Many plastics, fibers, and biological molecules are polymers.

Calcium and magnesium ions cause hardness.
Hard water forms scale and reduces soap lather.

Strong polymer structures can resist decomposition.
This durability is useful but creates waste-management problems.

Hardness ions react with soap molecules.
The insoluble products waste soap and reduce lather.