08 Transport in Plants

What are the main functions of xylem in plants?

• Transport of glucose and oxygen

• Transport of sucrose and amino acids

• Transport of water and mineral ions, and support

• Transport of proteins

What is the function of phloem tissue?

• Photosynthesis

• Transport of water only

• Transport of sucrose and amino acids

• Structural support only

Where is the xylem found in a root cross-section of a dicotyledonous plant?

• Outer cortex

• Center of the root

• Between the epidermis and cortex

• In the epidermis

In a dicot stem cross-section, where are the xylem and phloem located?

• Xylem outside, phloem inside

• Both in the center

• Xylem inside, phloem outside in vascular bundles

• Randomly distributed

Which feature of xylem vessels helps support the plant?

• Thin cell walls

• Presence of cytoplasm

• Thick walls with lignin

• Large central vacuole

Why are xylem vessels efficient in transporting water?

• They have many cross walls

• They are filled with cytoplasm

• They are dead and form continuous tubes

• They store starch

What is the function of root hair cells?

• Photosynthesis

• Water and mineral ion absorption

• Transport of oxygen

• Prevent water loss

How does the structure of root hair cells help their function?

• Small surface area

• Thin cell wall and large vacuole

• Large surface area to increase absorption

• Thick cuticle

What is the correct pathway of water from the soil to the leaves?

• Xylem → Root hairs → Leaves

• Root hairs → Root cortex → Xylem → Mesophyll

• Stomata → Xylem → Leaves

• Root cortex → Root hairs → Xylem

What stain is commonly used to trace water movement in plants?

• Iodine

• Methylene blue

• Eosin

• Dye such as eosin or safranin