Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
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.
Root pressure is typically highest under which of the following conditions?
High soil moisture and high transpiration rate
Low soil moisture and low transpiration rate
Low soil moisture and high transpiration rate
High soil moisture and low transpiration rate
Guttation, the exudation of water droplets from leaves, is most likely to occur when:
Root pressure is low and transpiration is high.
Root pressure is high and transpiration is high.
Root pressure is low and transpiration is low.
Root pressure is high and transpiration is low.
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 main driving force for transpiration in plants is:
Root pressure
Capillary action
The difference in water potential between the leaf mesophyll and the atmosphere
Active transport of water through the xylem
Which type of transpiration accounts for the majority of water loss in plants?
Cuticular
Lenticular
Stomatal
Hydathode
Guttation is the loss of water in liquid form from plants. This process primarily occurs through:
Stomata
Lenticels
Hydathodes
Cuticle
Which of the following adaptations helps reduce transpiration in xerophytes?
Large, thin leaves
Sunken stomata
Numerous stomata on the upper leaf surface
Thin cuticle
The cohesion-tension theory explains the ascent of sap in plants. The 'cohesion' part of this theory refers to:
The attraction between water molecules and xylem walls
The attraction between water molecules
The evaporation of water from the leaf surface
The active transport of water into the xylem
