PLANT PHYSIOLOGY
TRANSPORT IN PLANT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
it is place to store the food
|
|
|
it has large surface area to absorb more water
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -The root system of the plant consists of a main root which gives out lateral roots. The lateral roots bear a large number of fine outgrowths called root hairs. The numerous root hairs provide a large surface area. More the surface area, more is the absorption of water from the soil.
Detailed explanation-2: -The root hairs present a large surface area. The more the surface area, the greater is the absorption. Each root hair has a semi-permeable membrane. It contains a solution (cell sap) of a higher concentration than surrounding soil water.
Detailed explanation-3: -The root hairs take water from the soil by a process called osmosis. In osmosis, water molecules move from a region of higher concentration to a region of lower concentration through a semi-permeable membrane. The concentration of the water molecules is lower in the root hair than in the soil.
Detailed explanation-4: -Their distinctive lateral elongation increases the surface of exchange between the plant’s root system and the soil. The main function of root hairs is the uptake of water and nutrients from the rhizosphere.
Detailed explanation-5: -Root hairs collect water and minerals that are present in the soil. They also increase the surface area for absorption.