Transport in Angiosperms - International Baccalaureate Biology - Lecture Slides, Slides of Biology

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Transport in Angiosperms

Uptake in the Root

The Root: Mineral and Water Uptake

• The root system in Angiospermophytes is designed for uptake of materials from the ground/soil.
• Xylem is the tissue involved, but does not regulate the absorption.
• Xylem is the vessel for transportation.

Branching

• Roots can branch out, forming vast networks of roots.
• The larger the plant, the larger the root size and branching area.
• Allows roots to reach deeper and/or to cover more area.

Large Tree Roots

Root Hairs

• Tiny, hair-like out growths of the root.
• Adapted for absorption of water and solutes.
• Only survive a few days, and only grow a few millimeters.

Root Hairs

Mineral Ion Uptake

• Roots uptake mineral ions through a process called active transport.
• Active transport requires energy.
• Energy comes from the high number of mitochondria found in the root hair cells.

Mineral Ion Uptake – Solute

Particle

Mineral Ion Uptake

• Root hair cells have protein channels that allow the active transport to take place.
• The mitochondria use aerobic respiration to produce the NRG – Need to understand only that aerated soils are best because aerobic respiration needs oxygen.
• Roots absorb potassium, phosphate, nitrates, and other mineral ions from soil.

Water Uptake – Water Particles

Water Uptake in the Root

• There are two main pathways that the water can follow through the root. - Symplastic Pathway - Apoplastic Pathway