IB Biology Exam

Which of the following are responsible for transpiration?
I. adhesion
II. cohesion
III. evaporation
IV. active transport

• I and II only
• I, II and III only
• I, and III only
• I, II, III and IV

Which factor will decrease the rate of transpiration?

• Wind
• Temperature
• Light intensity
• Humidity

What hormone is responsible for the closing of stomata?

• Abscisic Acid
• GA (Gibberellin)
• Auxin
• Phytochrome

What is a halophyte?

• Aquatic dwelling Plant
• Arid dwelling Plant
• Salt dwelling plant
• Air dwelling plant

Which of the following is an adaptation of a xerophyte?

• reduced roots
• hairy leaves
• many stomata
• thin cuticle

Which of the following play a role in stomata closing?

• K+ pumped out of guard cell; low levels of Abscisic Acid
• K+ is pumped out of guard cells; high levels of Abscisic Acid
• K+ is pumped into guard cells; low levels of Abscisic Acid
• K+ is pumped into guard cells; high levels of Abscisic Acid

Tags

NGSS.HS-LS1-3

Which cells are found in xylem?

• Tracheids
• Sieve Tubes
• Companion cells
• Cambium cells

How do minerals enter into plant cells?
I. Active transport
II. Bulk flow (with water)
III. Transport by Phloem

• I only
• I and II only
• I, II and III
• II and III only

What BEST defines adhesion.

• Water molecules bonding to each other due to the hydrophobic nature of water.
• Water molecules bonded to other other surfaces due to the transparency of water.
• Water molecules sticking to each other due to the polarity of water.
• Water molecules sticking to other surfaces due to the polarity of water.

Why do plants need to open stomata?
I. To get rid of excess CO₂

II. To allow transpiration
III. To exchange gases with the  environment

• I only
• I and II only
• II and III only
• I, II and III

Tags

NGSS.MS-LS1-6