Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
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
A plant is exposed to a chemical that specifically inhibits the activity of aquaporins in root cells. Which of the following would be the MOST direct consequence of this inhibition?
Increased rate of transpiration
Enhanced mineral absorption
Stimulation of phloem loading
Reduced water uptake by the roots
A xerophyte with a CAM pathway faces prolonged drought conditions. Which of the following physiological responses would be LEAST likely to occur?
Increased stomatal aperture during the day
Accumulation of organic acids at night
Reduced transpiration rates
Increased root-to-shoot ratio
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
A plant cell with a water potential of -0.6 MPa is placed in a solution with a water potential of -0.8 MPa. Which of the following will occur?
Water will move out of the cell, causing plasmolysis.
Water will move into the cell, causing turgor pressure to increase.
There will be no net movement of water.
The cell will burst due to excessive water uptake.
In facilitated diffusion, molecules move across the membrane with the help of:
ATP hydrolysis
Membrane proteins
Concentration gradient against their movement
Vesicle formation
The inner membrane of the mitochondria is highly folded. What is the purpose of these folds, called cristae?
Store genetic material
Facilitate protein synthesis
Increase surface area for ATP production
Regulate the passage of molecules
Which type of molecule can easily pass through the cell membrane without assistance?
Large, polar molecules
Ions
Small, nonpolar molecules
Proteins
The diffusion coefficient of a gas is inversely proportional to the square root of its molar mass. If gas A has a molar mass four times that of gas B, under identical conditions, the diffusion rate of gas A will be:
Twice that of gas B
Half that of gas B
Four times that of gas B
One-fourth that of gas B
In a biological system, the diffusion of a lipophilic substance across a cell membrane is primarily limited by:
The hydrophobic core of the lipid bilayer
The aqueous unstirred layers adjacent to the membrane
The presence of membrane proteins
The concentration gradient of the substance
