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Home Biotechnology Transport of Molecules in Plant Comments

  • Question
  • Phloem is composed of


  • Options
  • A. vessel elements and companion cells
  • B. tracheids and vessel elements
  • C. sieve-tube elements and companion cells
  • D. tracheids and sieve-tube elements

  • Correct Answer
  • sieve-tube elements and companion cells 


  • Transport of Molecules in Plant problems


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    • 1. The evaporation of water from leaves is called

    • Options
    • A. transpiration
    • B. cohesion
    • C. tension
    • D. pressure flow
    • Discuss
    • 2. The cohesion-tension theory of water movement helps to explain how water moves from soil into root?

    • Options
    • A. Through the phloem
    • B. From leaf to root
    • C. Through the xylem
    • D. Into the guard cells
    • Discuss
    • 3. When guard cells swell

    • Options
    • A. stomata close
    • B. stomata open
    • C. photosynthesis stops
    • D. evaporation stops
    • Discuss
    • 4. Water moves into roots of plants by

    • Options
    • A. osmosis
    • B. active transport
    • C. diffusion
    • D. pressure flow mechanism
    • Discuss
    • 5. The movement of most minerals, including potassium into root cells is by

    • Options
    • A. osmosis
    • B. diffusion
    • C. bulk flow
    • D. active transport
    • Discuss
    • 6. Cell fusion method includes the preparation of large number of

    • Options
    • A. plant cells stripped of their cell wall
    • B. single plant cell stripped of their cell wall
    • C. plant cells with cell wall
    • D. cells from different species
    • Discuss
    • 7. Which of the following is considered as the disadvantage of conventional plant tissue culture for clonal propagation?

    • Options
    • A. Multiplication of sexually derived sterile hybrids
    • B. Less multiplication of disease free plants
    • C. Storage and transportation of propogates
    • D. Both (b) and (c)
    • Discuss
    • 8. Protoplasts can be produced from suspension cultures, callus tissues or intact tissues by enzymatic treatment with

    • Options
    • A. cellulotyic enzymes
    • B. pectolytic enzymes
    • C. both cellulotyic and pectolytic enzymes
    • D. proteolytic enzymes
    • Discuss
    • 9. The ability of the component cells of callus to form a whole plant is known as

    • Options
    • A. redifferentiation
    • B. dedifferentiation
    • C. either (a) or (b)
    • D. none of these
    • Discuss
    • 10. When plated only in nutrient medium, how much time is required for the protoplast to synthesize new cell wall?

    • Options
    • A. 2-5 days
    • B. 5-10 days
    • C. 10-15 days
    • D. 15-17 days
    • Discuss


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