Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
The bulliform cells in the leaves of certain grasses play a crucial role in:
Increasing the photosynthetic surface area.
Secreting resinous substances for protection.
Leaf rolling and unfolding in response to water availability.
Storing water for use during drought.
Which of the following is the primary function of a leaf?
Transpiration
Reproduction
Storage
Photosynthesis
Under conditions of high transpiration pull, the primary driving force for water movement through the xylem is:
Root pressure generated by active transport of ions.
Capillary action within the narrow xylem vessels.
Active transport of water molecules by xylem parenchyma cells.
Cohesion and adhesion of water molecules, creating a continuous water column.
The guttation phenomenon observed in some plants is primarily driven by:
High transpiration rates during the day.
Active transport of water into the xylem by xylem parenchyma.
Root pressure exceeding transpiration pull, particularly at night.
Capillary action in the xylem vessels.
Which combination of factors would MOST effectively enhance the rate of transpiration in a plant?
Low light intensity, high humidity, open stomata, and still air
High light intensity, high humidity, closed stomata, and strong wind
Low light intensity, low humidity, closed stomata, and still air
High light intensity, low humidity, open stomata, and strong wind
Which of the following combinations of factors would result in the HIGHEST rate of transpiration in a mesophytic plant?
High temperature, low humidity, high wind speed, open stomata
Low temperature, high humidity, low wind speed, open stomata
High temperature, high humidity, high wind speed, closed stomata
Low temperature, low humidity, low wind speed, closed stomata
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
Under which of the following specific environmental conditions would guttation be LEAST likely to occur?
Cool, humid night with high soil moisture
Warm, humid morning with adequate soil moisture
Cool, dry night with moderate soil moisture
Hot, dry day with low soil moisture
A plant exhibits vigorous guttation during the night. Which of the following would be the MOST likely consequence of completely sealing the hydathodes with a waterproof sealant without harming the plant otherwise?
A significant decrease in root pressure
A substantial increase in transpiration rate
No change in root pressure or transpiration rate
A slight increase in root pressure
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.
