A plant requires magnesium for
Holding cells together
Protein synthesis
Chlorophyll synthesis
Cell wall development
The minerals involved in water-splitting reaction during photosynthesis are
Magnesium and chlorine
Potassium and manganese
Manganese and chlorine
Copper and chlorine
Translocation of organic materials in plants is explained by
Active transport
Transpiration pull
Inhibition theory
Mass-flow hypothesis
In osmosis, there is movement of
Solute only
Solvent only
Both (a) and (b)
Neither solute nor solvent
Opening and closing of stomata is due to
Ca2+
Na+
K+
Cl-
In higher plants, the shape of the chloroplast is
Discoid
Cup-shaped
Girdle-shaped
Reticulate
Which of the following is appropriate for mass-flow hypothesis?
Transpiration pull is responsible for absorption of ions
Large amount of ions are also absorbed along with the absorption of water
As suction pressure increases, absorption of water increases and along with water, absorption of ion also increases
All of the above
Water rises in the stem due to
Cohesion and transpirational pull
Turgor pressure
Osmotic pressure
Root absorption
‘Mottled chlorosis’ on the leaves occurs due to the deficiency of
Nitrogen
Phosphorus
Potassium
Sulphur
Why the tropical deciduous forest trees shed their leaves?
To save energy
To protect itself from heat
To enhance rate of respiration
To prevent loss of water
