Which of the following BEST explains why the ascent of sap in tall trees is primarily attributed to the cohesion-tension theory rather than root pressure?
Root pressure only operates during the night
Root pressure is primarily involved in nutrient transport, not water transport
Root pressure alone cannot generate sufficient pressure to overcome the gravitational force in tall trees
The cohesion-tension theory is more energy-efficient than root pressure
Related Questions
Arrange the following plants in ascending order based on the number of xylem strands in their roots.
I. Trapa II. Pisum III. Castanea IV. Nicotiana
II, IV, III, and I
III, IV, II, and I
IV, III, I, and II
I, IV, II and III
Gymnosperms lack which of the following structure?
Tracheids
Vessels
Xylem
Phloem
The main function of xylem fibres is:
Water transport
Mineral transport
Food storage
Providing mechanical support
Which of the following correctly describes the xylem arrangement in a dicot root?
Endarch
Exarch
Mesarch
Centerarch
In a typical monocot stem, the xylem arrangement is:
Endarch
Exarch
Mesarch
Centerarch
Which element of xylem is the characteristic feature of angiosperms?
Tracheids
Phloem
Vessels
Xylem fibre
The function of a vessel is conduction of
Food
Water and minerals
Hormones
All of these
The lignified secondary walls of xylem elements provide:
Flexibility for bending and twisting
Storage of water and nutrients
Mechanical strength and prevention of collapse under tension
Increased surface area for water absorption
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
elongating
maturing
differentiating into secondary xylem
undergoing secondary growth
How does the arrangement of cellulose microfibrils in the secondary cell walls of xylem vessels contribute to their function?
Facilitates rapid water flow through the vessel lumen
Increases the flexibility of the vessel walls
Provides strength and prevents collapse under negative pressure
Regulates the passage of ions and nutrients into the xylem sap
