FPSC MCQs

Deforestation removes tree cover for farming, timber, or development.
It can reduce biodiversity and increase erosion.

Direct pressure helps compress damaged vessels and promote clotting.
Emergency help is needed if bleeding is severe.

Nitrogen makes up about 78% of the atmosphere.
Oxygen is the second most abundant gas.

Oxygen accounts for about 21% of dry air.
It supports respiration and combustion.

The troposphere contains most atmospheric water vapor.
Clouds, rain, and storms form mainly in this layer.

Stratospheric ozone absorbs much ultraviolet radiation.
This helps protect living organisms from DNA damage.

Iron is part of the hemoglobin molecule.
Deficiency can reduce oxygen-carrying capacity.

Greenhouse gases slow the escape of heat to space.
The natural effect keeps Earth habitable, but added gases increase warming.

The cerebellum fine-tunes movements and posture.
Damage can cause poor coordination.

The medulla regulates vital involuntary functions.
These include breathing rhythm and heart rate.

Neurons receive and transmit electrical and chemical signals.
They form the basic units of the nervous system.

The eye focuses light onto the retina.
Photoreceptors convert it into nerve signals.