Material Transport - Xylem

The part labelled 'A' is the ______ of the stem.

• Xylem
• Phloem
• Vascular tissue
• Pith

The part labelled 'A' is the ___ of the plant.

• Epidermis
• Node
• Petiole
• Internode

The Xylem is NOT directly responsible for ___ in a plant.

• Thermoregulation
• Transport of minerals
• Transport of water
• Transport of sugars

Transport in the Xylem is multidirectional.

• True
• False

Xylem is coated with _____ to strengthen them and to prevent them from collapsing.

• Suberin
• Lignin
• Calcium
• Wood

Water is pulled up the xylem due to the interaction between water molecules. This is known as ____

• The adhesion–tension theory of sap ascent
• The cohesion–adhesion theory of sap ascent
• The cohesion–transpiration theory of sap ascent

The component of xylem tissues labelled E F G in the figure is known as ______

• Vessel elements

• Tracheids

• Fibres

• Sieve tubes

Majority of the water lost from leaves escapes through the ______.

• Leaf cuticle
• Leaf margin
• Stomata
• Leaf veins

Transpiration helps in thermoregulation by lowering the temperature of a plant by approximately how many degrees Celsius compared to a wilting leaf?

• 5–6 °C

• 3–4 °C

• 8–9 °C

• 6–7 °C

What is a potential consequence of overheating in plants due to insufficient transpiration?

• Root rot

• Enhanced photosynthesis

• Chloroplast damage

• Increased growth rate