CBSE  /  Class 11  /  Biology  /  Transport in Plants

  • 1. 
    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

  • 2. 
    Wilting of a plant results from excessive

  • respiration
  • photosynthesis
  • absorption
  • transpiration

  • 3. 
    Cohesion theory of water movement in plants was put forth by

  • Henry Dixon
  • F. F. Blackman
  • Melvin cycle
  • Hans. A. Krebs

  • 4. 
    Diffusion rate is affected by

  • temperature
  • membrane permeability
  • gradient of concentration
  • all of these

  • 5. 
    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

  • 6. 
    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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