3.1.3 - Transport In Plants

Question 1

What word defines when two solutions have an equal concentration of a solute?

Higher solute concentration?

Lower?

Answer 1

Isotonic

Hypertonic

Hypotonic

Question 2

What word describes when a cell has as much water as possible in it?

Least water possible?

Answer 2

Turgid

Plasmolysed

Question 3

Define osmosis.

What is water potential measured in?

Answer 3

The random net movement of water molecules through a partially permeable membrane down a water potential gradient.

Pascals

Question 4

Explain the need for transport systems in multicellular plants.

Answer 4

SIZE - perennial plants are large and require a transport system to move substances both up and down

METABOLIC RATE - high metabolism means a transport system is needed to transport substances (like glucose and oxygen) to and from the cells that need them

SA:V RATIO - high on leaves but small overall so diffusion isn’t enough to transport materials around the plant

Question 5

In a TS view of a dicot leaf, which side of the vascular bundle carries the phloem and which the xylem?

Answer 5

Phloem on midrib side

Xylem on palisade side

Question 6

Where is the vascular bundle in the stem, roots, and leaves?

What benefit does each positioning have?

Answer 6

STEM - around the edge ; give strength and support

ROOTS - in the middle ; withstand strain from the wind

LEAVES - midrib ; transport and support

Question 7

Where on a leaf are the guard cells found

Answer 7

The lower epidermis