Plant Transport Mechanisms and Functions

The video tutorial covers plant transport mechanisms, focusing on transpiration and its role in water movement through plants. It explains factors affecting transpiration, such as humidity and stomata closure. The tutorial also discusses root pressure and xylem function, highlighting active transport of mineral ions. Additionally, it covers phloem transport, detailing the movement of carbon compounds from source to sink, and the roles of companion cells and sieve tubes in this process.

What is the primary function of transpiration in plants?

• To produce energy

• To cool the plant

• To move water through the plant

• To absorb nutrients from the soil

Which condition can slow down or stop transpiration?

• Bright sunlight

• High humidity

• Low humidity

• High wind speed

What happens when the stomata close?

• Photosynthesis increases

• Transpiration ceases

• Transpiration increases

• Water absorption stops

How do plants create pressure to move water up through the xylem?

• By increasing leaf surface area

• By reducing root size

• By active transport of mineral ions into roots

• By closing stomata

What is the role of osmosis in water movement in plants?

• It moves water from xylem to phloem

• It moves water from leaves to roots

• It moves water from soil to roots

• It moves water from roots to leaves

What is the main function of the phloem in plants?

• Transport water upward

• Transport carbon compounds from source to sink

• Store nutrients

• Support the plant structure

What is phloem loading?

• The active transport of carbon compounds into the phloem

• The storage of nutrients in the phloem

• The process of water entering the phloem

• The movement of water from phloem to xylem

What is the role of companion cells in the phloem?

• They provide structural support

• They store water

• They transport water

• They assist in phloem loading

What is the significance of sieve tubes in the phloem?

• They provide energy

• They transport water

• They allow movement of carbon compounds

• They store nutrients

How do carbon compounds move from source to sink in the phloem?

• By osmosis

• By gravity

• By diffusion

• By active transport