CBSE Class 10 Answered
Dear Sir/Madam
Please explain me absorption of minerals by root hair and also absorption of water separatrely
Thanks
Regards
Asked by arti.aggarwal17 | 13 Feb, 2019, 08:01: AM
Expert Answer
Mechanism of Transport of Water and Minerals
Root Pressure
- Water enters the root hair through osmosis, and mineral ions enter the root cells by active transport.
- Both water and minerals move upward from cell to cell through the cortex of the root by osmosis.
- From the cortex, water and minerals are brought to the xylem.
- The sap which contains water and dissolved minerals move upwards from the root cells through the xylem. The upward movement of sap is called the ascent of sap.
- The xylem vessels of the roots are in continuation with the xylem vessels of the stem.
Transpiration Pull
- Transpiration is the loss of water in the form of water vapour from the aerial parts of a plant.
- It occurs through openings called stomata.
- Water loss through evaporation lowers the concentration of water inside the mesophyll cells.
- Due to this, water enters mesophyll cells from neighbouring xylem vessels through osmosis.
- As water evaporates from the leaves, a suction force is created. This force helps to draw more water up through the stem which causes the roots to absorb more water from the soil.
- Higher the rate of transpiration, greater the rate of absorption of water and solutes from the soil.
- Transpiration also helps in maintaining the temperature of the plant body.
Mechanism of Transport of Food
- Food synthesised during photosynthesis is loaded into sieve tubes by utilising ATP.
- The presence of food inside the phloem develops the concentration gradient of water. Thus, water enters the phloem by osmosis.
- Osmosis develops high pressure inside the phloem which transports the food from the phloem to plant parts where the concentration of food is less.
- This process is called translocation.
- In spring, the sugar stored in the root or stem tissues is transported to the buds.
Answered by Sheetal Kolte | 13 Feb, 2019, 11:48: AM
Application Videos
Concept Videos
CBSE 10 - Biology
Asked by amulyasavataikar | 10 Apr, 2023, 04:41: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by rgiri4857 | 19 Apr, 2022, 07:30: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by ps8843899 | 08 Mar, 2022, 10:07: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by Trisha Gupta | 27 Jun, 2021, 07:43: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by Trisha Gupta | 12 Jun, 2021, 04:51: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by deepakgnildh | 14 Feb, 2021, 07:13: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by sattusatyamm | 05 Jun, 2020, 10:06: AM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by queenwara949 | 02 Jun, 2020, 07:05: AM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by reshmasouza2010 | 11 Mar, 2019, 08:58: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by arti.aggarwal17 | 13 Feb, 2019, 08:01: AM
ANSWERED BY EXPERT