3.1.3: Transport In Plants

Question 1

What are the main substances transported in plants?

Answer 1

Water and organic substances

These organic substances include sugars produced during photosynthesis.

Question 2

What are the two types of tissues involved in transport in plants?

Answer 2

Xylem and phloem

These tissues are collectively described as the vascular bundle.

Question 3

What is the function of phloem tissue?

Answer 3

Transports organic substances made in photosynthesis

This process is also known as translocation.

Question 4

What are sieve tube elements?

Answer 4

Long, thin cells arranged as a column with perforated end walls

They are living cells that contain no nucleus and very few organelles.

Question 5

Why do sieve tube elements have few organelles?

Answer 5

To make the cell partially hollow and reduce resistance to sugar flow

This structural adaptation facilitates the efficient transport of sugars.

Question 6

What are companion cells?

Answer 6

Cells that provide ATP for active transport of organic substances

They support sieve tube elements which lack sufficient organelles.

Question 7

Fill in the blank: Phloem tissue transports organic substances through _______.

Answer 7

Translocation

Question 8

True or False: Sieve tube elements are dead cells.

Answer 8

False

Sieve tube elements are living cells but have very few organelles.

Question 9

What is a vascular bundle?

Answer 9

A collective term for xylem and phloem tissues

Vascular bundles are essential for the transport system in plants.

Question 10

What is the role of ATP in phloem transport?

Answer 10

Required for the active transport of organic substances

Companion cells produce ATP which is vital for this process.