Transport in Plants AS Level

Xylem transports ​ (a)   and minerals from the ​ (b)   to the leaves. The mass flow of xylem contents occurs against ​ (c)   . Xylem's lumen is ​ (d)   which reduces the resistance for the mass flow significantly. Unlike many other cells in plants, the xylem wall is made of ​ (e)   which is waterproof and strong.

• water
• roots
• gravity
• hollow
• lignin
• cellulose
• fruits

Which one is the process that begins transpiration?

• Photosynthesis
• Respiration
• Evaporation from leaves
• Osmosis

Select the phenomena that are caused by hydrogen bonds.

• adhesion

• cohesion

• diffusion

• osmosis

Match the following.

• nucleus

• Missing in sieve element but present in most cells in plants

• hydrogen

• Property of water that helps cool down organism

• plasmodesma

• Ion that is co-transported with sucrose into the companion cells

• sieve plates

• The term for end walls in the sieve element

• High latent heat of vaporisation

• Sucrose passes through this passively into the sieve element

Which is inversely proportional to the rate of transpiration?

• light intensity

• humidity

• wind speed

• temperature

In which state does water diffuse out of the leaf?

• gas

• liquid

• solid

• aqueous solution

In the ___ mesophyll, most gaseous exchange and evaporation occur.

Which adaptation is not for trapping humid air in xerophytes?

• Sunken stomata
• Thick cuticle
• Broad leaves
• Hairy leaves

What is the name of pathway taken by water through the cell wall?

Reorder the following from the lowest to the highest water potential.

• soil

• root hair

• atmosphere

• mesophyll cells

• xylem