Wilting of a plant results from excessive
  • respiration
  • photosynthesis
  • absorption
  • transpiration
Dry seeds kept in water swell due to
  • absorption
  • diffusion
  • imbibition
  • none of these
Which of the following is the unit of ψ?
  • Pascal
  • Joule
  • Newton
  • Electron volt
Which of the following is decreased during increase in humidity in the atmosphere?
  • Transpiration
  • Photosynthesis
  • Respiration
  • Glycolysis
Two types of molecules cross the membrane in the same direction, it is called as
  • Uniport
  • Symport
  • Antiport
  • Multiport
Diffusion rate is affected by
  • temperature
  • membrane permeability
  • gradient of concentration
  • all of these
Cells shrink in _________ solution.
  • isotonic
  • hypotonic
  • hypertonic
  • hypotonic and hypertonic
Which of the following is true about diffusion?
  • There is no expenditure of energy.
  • Molecules move in Brownian motion.
  • Substances moves from the region of higher concentration to the region of lower concentration.
  • Diffusion depends on the type of living system.
Water is lost in a liquid state in some plants through hydathodes. These hydathodes
  • do not show any specificity in opening and closing
  • remain closed during day
  • remain closed at night
  • remain always open
If pressure greater than atmospheric pressure is applied to pure water, the water potential
  • increases
  • decreases
  • remains same
  • atmospheric pressure does not affect water potential
Choose the correct sequence of water movement in the plants.
  • Cortex, protoxylem, endodermis, root hair, pericycle, metaxylem
  • Root hair, cortex, endodermis, pericycle, protoxylem, metaxylem
  • Root hair, protoxylem, metaxylem, pericycle, cortex, endodermis
  • Root hair, pericycle, endodermis, cortex, protoxylem, metaxylem
Cohesion theory of water movement in plants was put forth by
  • Henry Dixon
  • F. F. Blackman
  • Melvin cycle
  • Hans. A. Krebs
When a plant is girdled (ringed)
  • the root and shoot die at the same time
  • the shoot dies first
  • the root dies first
  • neither root nor shoot will die
Assertion (A): K+ ion accumulation found in Nitella depends on its respiratory activity. Reason (R): Absorption of all ions in plants completely depends on the usage of metabolic energy. The correct answer is
  • A and R are true and R is the correct explanation of A
  • A and R are true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
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