Transpirational pull is responsible for the ascent of water in the xylem. This ascent of water is dependent on the following physical factors:
• Cohesion – Mutual attraction between water molecules
• Surface tension – Responsible for the greater attraction between water molecules in liquid phase than in gaseous phase
• Adhesion – Attraction of water molecules to polar surfaces
• Capillarity –Ability of water to rise in thin tubes.
These physical properties of water allow it to move against gravity in the xylem.
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
How do you distinguish between a skeletal muscle and a cardiac muscle?
What are nuclear pores? State their function.
Define sliding filament theory of muscle contraction.
Goodð
Not only transpiration pull is necessary others are also there
Not only transpiration pull is necessary others are also there
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