Advertisements
Advertisements
प्रश्न
How is root hair adapted for the absorption of water from the soil?
उत्तर
The main root with its many branches form a network in the soil. The root hairs get entangled in the soil particles and remain in close contact with the capillary water surrounding the soil particles. The epidermal cells of root hairs have vacuoles which contain cell sap. Generally, the cell sap is more concentrated than the soil solution. As a result the water enters inside the root hair cells by endosmosis. This water dilutes the epidermal cell sap solution. Then water enters into the cortical cells by osmosis and reaches the endodermal cells and then pericycle cells. From this layer water then enters in the xylem tissue. In this way, the water is absorbed and translocated up to xylem of the root by osmosis.
APPEARS IN
संबंधित प्रश्न
Given below is the diagrammatic representation of the transverse section of a part of a plant. Study it and answer the questions that follow:
(a) Name the part of the plant that is shown
(b) Label the parts 1 to 6
(c) Write the functions of parts 3 and 5
Choose the correct answer:
In ascent of sap water reaches upwards ____________
Choose the correct answer:
Wilting of plants occurs when ____________
Mention whether the following statement is true (T) or false (F) and give explanation in support of your answer.
Dry seeds when submerged in water swell up due to endosmosis.
Give Technical Term for the following.
Phenomenon of absorption of water by surface attraction.
Give Technical Term for the following.
Tissue which transports manufactured food from leaves to other parts of the plant.
Give Technical Term for the following.
The tissue responsible for the ascent of sap in plants.
The tubular, colorless delicate prolongations of epidennal cells are seen in which region of root in plants?
The unbranched root hair in plants is formed from ____________.
