When pea seeds and wheat grains are soaked in water pea seeds showed more swelling than the wheat. The reason is
Imbibition capacity of proteins is more than that of starch
Presence of less hydrophilic colloids in the wheat grains.
Cell membrane of pea is more permeable
Cell wall of wheat grains are less permieable.
The deficiencies of micronutrients not only affects growth of plants but also vital functions, such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport ?
Cu, Mn, Fe
Co, Ni, Mo
Mn, Co, Ca
Ca, K, Na.
Zn, Mo, Fe, Cu are
Trace elements
Non-essentials
Macronutrients
None of these
Opening and closing of stomata is due to
Ca2+
Na+
K+
Cl-
Stomata which can open at night,are present in
Xerophytes
Gametophytes
Hydrophytes
Which of the following is a nitrogen-fixing organism ?
BGA
Rhizobium
Both BGA and Rhizobium
Aspergillus
If turgidity of a cell surrounded by water increases, the wall-pressure will
Increase
Decrease
Fluctuate
Remain unchanged
In plants, water supply is due to
Osmosis
Imbibition
Guttation
Adhesion force
Path of water movement from soil to xylem is
Soil → root hair → cortex → pericycle → endodermis → metaxylem → protoxylem
Soil → root hair → cortex → endodermis → pericycle → protoxylem → metaxylem
Soil → root hair → epidermis → endodermis → phloem → xylem
Soil → root hair → cortex → protoxylem → phloem → metaxylem
Potometer works on the principle of
Amount of water absorbed equals the amount transpired
Osmotic pressure
Root pressure
Potential difference between the tip of the tube and that of the plant.
