CBSE
Multiple Choice QuestionsThe water potential of pure water is
Zero
Less than zero
More than zero but less than one
More than zero but less than one
Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
Movement of water from cell B to A
No movement of water
Equilibrium between the two
Equilibrium between the two
Which of the following elements is responsible for maintaining turgor in cells?
Magnesium
Sodium
Calcium
Potassium
The translocation of organic solutes in sieve tube members is supported by
root pressure and transpiration pull
P-proteins
mass flow involving a carrier and ATP
mass flow involving a carrier and ATP
In which form does the food is transported in plants?
Sucrose
Fructose
Glucose
Lactose
Which of the following facilitates opening of stomatal aperture?
Contraction of outer wall of guard cells
Decrease in turgidity of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Some functions of the nutrient element are given below
The concerned nutrient is
Cu
Fe
Ca
Mo
Stomatal movement is not affected by
Temperature
Light
CO2 concentration
O2 concentration
Which of the following is made up of dead cells?
Xylem parenchyma
Collenchyma
Phellem
Phellem
Tyloses an outgrowth from ray or axial parenchyma cell into the lumen of a vessel, which partially or completely blocks the cavity are present in
Periderm
Heart wood
Sap wood
Secondary cortex
