PPSC MCQs

Platelets gather at damaged vessels and activate clotting.
This limits blood loss.

Chlorophyll absorbs mainly blue and red light.
Its green color results from reflected green wavelengths.

Plasma carries cells, nutrients, hormones, wastes, and proteins.
It is mostly water.

Most transpiration occurs through leaf stomata.
It helps pull water upward through xylem.

The anther is part of the stamen.
It contains pollen-producing structures.

The stigma is typically sticky or adapted to catch pollen.
It is part of the female reproductive structure.

Pollination occurs before fertilization in flowering plants.
It may be carried out by wind, insects, or other agents.

Germination begins when suitable moisture, oxygen, and temperature are available.
The embryo resumes growth.

Osmosis is a special case of water movement across a membrane.
It affects cell volume and water balance.

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.

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