Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
The cohesion-tension theory explains the ascent of sap in tall trees. Which of the following factors LEAST contributes to the maintenance of the continuous water column?
Active transport of water into xylem vessels
Cohesion between water molecules
Adhesion of water molecules to xylem walls
Transpiration pull generated by evaporation from leaves
The primary mechanism for xylem sap ascent in tall trees is transpiration pull. However, root pressure plays a minor role. Which statement BEST describes the limited contribution of root pressure to overall xylem sap ascent in tall trees?
Root pressure generates excessive pressure that could damage the delicate xylem tissues in tall trees.
Root pressure is only active during the night and therefore cannot contribute to daytime transpiration.
Tall trees have a significantly lower root surface area to volume ratio, minimizing the contribution of root pressure.
Root pressure can only push water a limited height due to the opposing force of gravity and the relatively low pressure generated.
The upward movement of water against gravity in tall trees is primarily due to:
Transpiration pull
Root pressure
Capillary action
Active transport
Which of the following is NOT a long-distance transport pathway in plants?
Xylem
Phloem
Apoplast
Symplast
The upward movement of water in tall trees is primarily driven by:
Root pressure
Capillary action
Transpiration pull
Active transport
Which of the following statements is INCORRECT regarding root pressure?
Root pressure is a positive hydrostatic pressure.
It is mainly responsible for the bulk flow of water in tall trees.
It is a pressure developed in the xylem of roots.
It is generally more effective at night or early morning.
The main difference between root pressure and transpiration pull is that:
Root pressure pushes water up the xylem, while transpiration pull pushes water down from the leaves.
Root pressure occurs only at night, while transpiration pull occurs only during the day.
Root pressure is active transport, while transpiration pull is passive transport.
Root pressure is a positive pressure generated in the roots, while transpiration pull is a negative pressure generated in the leaves.
The process of mineral ions moving from one part of the plant to another is primarily driven by:
Diffusion and osmosis
Active transport and transpiration pull
Gravity and capillary action
Passive transport and root pressure
Given below are two statements:
Statement I: The transpiration pull generated by water loss can create enough tension to lift a xylem-sized column of water over 130 meters high.
Statement II: Transpiration plays a significant role in cooling leaf surfaces, sometimes by 10 to 15 degrees, due to evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
The transpiration pull in plants can lift a column of water in xylem to a height of over 130 meters. This lift is primarily driven by:
Active transport of water by root cells
Capillary action in xylem vessels
Root pressure generated in the roots
Evaporation of water from leaves
