ch.7 Flowering Plants: Nutrition and Transport

Which structure allows carbon dioxide to enter plant leaves?

• Xylem

• Phloem

• Stomata

• Guard Cells

What is the primary function of xylem in vascular plants?

• Transport of sugars and nutrients

• Transport of water and minerals

• Gas exchange

• Support for photosynthesis

Tracheids and vessel elements are types of cells found in which plant tissue?

• Epidermis
• Cortex
• Phloem
• Xylem

Which property of water contributes to its movement through xylem vessels?

• Its ability to be stored as ice

• Hydrogen bonding

• Low boiling point

• Nonpolarity

What is the term for the process of water evaporation from plant leaves?

• Transpiration
• Osmosis
• Condensation
• Photosynthesis

The cohesion-tension model describes how water moves in the xylem. Which part of this model explains how water molecules are pulled upwards?

• Cohesion and adhesion

• Root pressure

• Gravity

• Evaporation at the roots

Root pressure causes water to be pushed upwards in plants. Which phenomenon is directly caused by root pressure?

• Transpiration
• Respiration
• Guttation
• Photosynthesis

What enables sieve-tube members in the phloem to transport organic nutrients?

• Root hairs and stomata
• Xylem vessels and dead cells
• Sieve plates with pores

• Chloroplasts and guard cells

Which cells in the phloem support sieve-tube members by providing proteins?

• Companion cells
• Sclerenchyma cells
• Parenchyma cells
• Xylem cells

Why do stomata close when a plant is under water stress?

• Stomata close to promote root growth.
• Stomata close to increase photosynthesis.
• Stomata close to absorb more sunlight.
• Stomata close to conserve water during water stress.