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.
Define a taxon. Give some examples of taxa at different hierarchical levels.
What are the steps involved in formation of a root nodule?
What is meant by the term osmoregulation?
What are the steps involved in formation of a root nodule?
State the role of pancreatic juice in digestion of proteins.
Match the following (a) Cristae (i) Flat membranous sacs in stroma (b) Cisternae (ii) Infoldings in mitochondria (c) Thylakoids (iii) Disc-shaped sacs in Golgi apparatus
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Not only transpiration pull is necessary others are also there
Not only transpiration pull is necessary others are also there
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