Pakistan MCQs

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

Yeast ferments sugars and releases carbon dioxide.
Gas bubbles expand within the dough.

Organ systems coordinate complex tasks.
Examples include the digestive and circulatory systems.

Lactic-acid bacteria ferment milk sugar.
The acid causes proteins to thicken and gives yogurt its sour taste.

Xylem conducts water and dissolved minerals from roots.
It also helps support the plant.

Pasteurization heats food or drink for a specified time.
It improves safety while limiting quality changes.

Many foodborne bacteria grow quickly at warm temperatures.
Prompt refrigeration reduces the risk.

Cells are the smallest units capable of carrying out life processes.
All living organisms consist of one or more cells.

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

Natural gas consists mainly of methane.
It burns relatively cleanly compared with coal.

Temporary hardness is caused mainly by bicarbonates.
Boiling converts them into insoluble precipitates.

Liquefied petroleum gas is mainly propane and butane.
Pressure keeps these gases liquid in cylinders.