Transportation Mechanisms in Plants: Xylem, Phloem, and Water Absorption

The video tutorial explains the transportation system in plants, focusing on the roles of xylem and phloem cells. It covers how plant roots absorb water and minerals through apoplastic and symplastic pathways. The xylem transports water and nutrients from roots to other parts of the plant, while the phloem distributes glucose produced during photosynthesis. The process of transpiration and the stomatal mechanism for gaseous exchange are also discussed.

What are the primary functions of xylem and phloem in plants?

• Both xylem and phloem transport nutrients.

• Xylem transports nutrients; phloem transports water.

• Both xylem and phloem transport water.

• Xylem transports water; phloem transports nutrients.

How do root hairs assist in water absorption?

• By converting water into nutrients.

• By increasing the surface area for absorption.

• By storing water for later use.

• By decreasing the surface area for absorption.

What is the apoplastic pathway?

• Movement of water through the cytoplasm.

• Movement of water through the phloem only.

• Movement of water through cell walls and spaces.

• Movement of water through the xylem only.

What happens during the symplastic pathway?

• Water moves through cell walls.

• Water moves through the cytoplasm.

• Water moves through the phloem only.

• Water moves through the xylem only.

What percentage of absorbed water is lost through transpiration?

• 95%

• 50%

• 100%

• 75%

How do guard cells regulate stomatal opening?

• By changing shape due to water and potassium ion movement.

• By releasing oxygen.

• By absorbing carbon dioxide.

• By producing glucose.

What role do stomata play in plants?

• They facilitate gaseous exchange.

• They produce glucose.

• They transport nutrients.

• They store water.

What is the primary function of phloem cells?

• Facilitating gaseous exchange.

• Storing minerals in roots.

• Transporting glucose and nutrients throughout the plant.

• Transporting water from roots to leaves.

Which cells are part of the phloem tissue?

• Stomata and guard cells.

• Parenchyma cells, sieve tube cells, and companion cells.

• Xylem vessels and tracheids.

• Guard cells and root hairs.

In which direction can phloem transport food?

• Only upwards.

• Only downwards.

• Only sideways.

• Both upwards and downwards.