ZIMSEC O Level Combined Science Notes: Plant transport and the structure of plants
- Plants have two main organ systems: a shoot system and a root system
- Is usually found beneath the ground.
- Anchors the plant into its position.
- Absorbs water and nutrients from the soil.
- Acts as a conduit (pipe) for water and nutrients.
- Stores food especially in tubers like sweet potatoes and potatoes.
- Is usually found above the ground.
- Elevates the plant above the soil.
- Performs many functions for example photosynthesis (leaves), reproduction and dispersal (flowers and fruits) etc.
- Acts as conduit for food and water.
Transport in plants
- Plants need substances form the environment e.g. carbon dioxide, water and oxygen.
- These substances cannot enter into the plant over its whole surface.
- Water enters thought the roots and the gases (oxygen and carbon dioxide) enter and leave through the roots.
- Water also leaves the plant via the leaves in a process called transpiration.
- Plants therefore need a transport system to carry the water up to the leaves and the food made in the leaves during photosynthesis
- and the food to other parts of the plant that cannot make their own food.
To access more topics go to the Combined Science Notes page.