Transport In Plants

Vascular Tissues

• Vascular tissues circulate water and nutrients in plants, similar to the circulatory system in animals.

• The two main types of vascular tissues are Xylem and Phloem.

Xylem

• Pronunciation: Zai-luhm

• Primary Function: Moves water and minerals UP from the roots to the top of the plant.

• Characteristics:

  • Water only flows upwards (one-way flow).

  • Found in roots, stems, and leaves.

Phloem

• Pronunciation: Flow-em

• Primary Function: Moves water and food (specifically glucose) both down and up throughout the plant (two-way flow).

• Characteristics:

  • Responsible for distributing sugar solutions to all parts of the plant.

  • Also found in roots, stems, and leaves.

Relationship Between Xylem and Phloem

• Xylem and Phloem are essential vascular tissues in plants analogous to veins and arteries in human bodies.

• Important mnemonic: "Xy high, Phlo low"—indicates the direction of transport (Xylem transports upwards and Phloem downwards).

Starch Storage

• Starch is primarily stored in the roots of the plants utilized for energy.

Transpiration

• Definition: Transpiration is the evaporation of water from plant leaves.

• Mechanism: Water escapes through tiny openings in leaves known as stomata (singular: stoma).

Stomata and Guard Cells

• Role of Stomata:

  • Acts like the breathing system for the plant.

  • Allows gas exchange necessary for plant survival.

• Guard Cells: Control the opening and closing of stomata, regulating water loss and gas exchange.