Transport In Plants

Question 1

Function of epidermis

Answer 1

Covers outer surfaces of plant for protection

Question 2

Palisade mesophyll

Answer 2

Main site of photosynthesis in leaf

Question 3

Spongy mesophyll

Answer 3

Air spaces between cells which allow gases to diffuse through leaf

Question 4

Xylem vessels

Answer 4

Transports water and minerals through plant, from roots to leaves
Supports plants

Question 5

Phloem vessels

Answer 5

Transports dissolved food materials through plant

Question 6

Meristem tissue

Answer 6

Found at tips of roots and shoots, produces new cells for growth

Question 7

What part of the plant is an organ

Answer 7

The leaf

Question 8

Water transport

Answer 8

• water and minerals are transported up xylem vessels, from roots to stem and leaves
• At leaves, most of water will evaporate and diffuse out of stomata (small pores)
• loss of water from leaves is called transpiration —> helps draw water up xylem vessels from roots

Question 9

Factors that affect the rate of transpiration

Answer 9

• increase in temp will increase rate as more energy is transferred to water to allow it to evaporate
• faster air flow will increase rate as it will blow away water vapour allowing more to evaporate
• increased light intensity increases rate, as stomata will open
• increase in humidity will decrease rate as air contains more water vapour, so conc gradient for diffusion is lower

Question 10

What is the role of guard cells

Answer 10

Open and close stomata

Question 11

Why does the stomata close at night

Answer 11

Because CO2 is not needed for photosynthesis so closing the stomata reduced water loss

Question 12

When water is plentiful, guard cells _______

Answer 12

Take up water and bend
-causes stomata to open so gases for photosynthesis are free to love in and out of stomata along with water from transpiration

Question 13

When water is scarce, losing water makes stomata ______

Answer 13

Change shape and close

-stops plant from losing more water through transpiration

Question 14

The rate of transpiration from a cut shoot an be estimated by ______

Answer 14

Measuring the rate at which the shoot takes up water, only an estimate because not all water taken up by least by a shoot is lost

Question 15

Movement of food through phloem tissue is called

Answer 15

TRANSLOCATION, phloem cells are adapted for this function

Question 16

Where is the stomata mainly found

Answer 16

Bottom surface of leaf, sin won’t shine directly on it, reducing water loss