Q. Select the correct statement
A) Water can be absorbed passively by roots
B) Ions are generally absorbed from soil by both active and passive transport
C) $C_{4}$ photosynthetic system is evolved for maximising the availability of $CO_{2}$ and to minimise loss of water
D) All of the above
Explanation
Passive absorption of water by root system is the result of tension on the cell sap in water column of xylem. It develops due to transpiration. Absorption of ions from soil can be by active and passive transport. $C_{4}$ photosynthetic system is found in number of tropical plants, both monocots and dicot like maize, sugarcane sorghum, Amaranthus etc. They are called $C_{4}$-plant because the first stable photosynthetic product produced is oxalo acetic acid (4 carbon compound)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.