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 are viroids different from viruses?
Name the components of the formed elements in the blood and mention one major function of each of them.
Write short notes on the functions of the following hormones,
(a) Parathyroid hormone (PTH)
(b) Thyroid hormones
(c) Thymosins
(d) Androgens
(e) Estrogens
(f) Insulin and Glucagon
What are the steps involved in formation of a root nodule?
Goodð
Not only transpiration pull is necessary others are also there
Not only transpiration pull is necessary others are also there
I like you bro