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Ans15. Due to evaporation of water from the cells present on the surface of the leaves (transpiration) a vacuum space is created. To fill that vacuum water droplets from the other cells rush inside. This rush of water towards the vacuum creates a mechanical force that enables to pull up water absorbed by the roots through the stems. These antis gravitational force that results in upward movement of water through the xylem is known as transpiration pull. In tall trees transpiration pull can draw water up to 50 meter height.
Ans16. Macronutrients: They are the nutrients required by plants in large amounts. They are present in plant tissues in amounts more than 10 mmole kg–1 of dry matter. Examples include hydrogen, oxygen, and nitrogen. Nitrogen in plants is useful in major component of chlorophyll.
Ans15. Due to evaporation of water from the cells present on the surface of the leaves (transpiration) a vacuum space is created. To fill that vacuum water droplets from the other cells rush inside. This rush of water towards the vacuum creates a mechanical force that enables to pull up water absorbed by the roots through the stems. These antis gravitational force that results in upward movement of water through the xylem is known as transpiration pull. In tall trees transpiration pull can draw water up to 50 meter height.
Ans16. Macronutrients: They are the nutrients required by plants in large amounts. They are present in plant tissues in amounts more than 10 mmole kg–1 of dry matter. Examples include hydrogen, oxygen, and nitrogen. Nitrogen in plants is useful in major component of chlorophyll.
Micronutrients: They are also called trace elements and are present in plant bodies in very small amounts, i.e., amounts less than 10 mmole kg– 1 of dry matter. Examples include cobalt, manganese, zinc, etc. Zinc helps in formation of auxins, which causes stem elongation.
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