(H) A researcher, who wants to study the composition of a plant's sap, inserts a capillary tube into the phloem. What causes the sap to flow out of the tube? (B) hydrostatic pressure (C) root pressure (D) transpiration stream (A) capillarity.
Answers
Explanation:The mechanism of the ascent of sap in plants occurs due to the activity of the living cells. The factors responsible are
root pressure- plant roots absorb the excess of water by an active process and builds up a hydrostatic pressure within the root system, called root pressure. This activity pushes the water upwards all along the length of the stem.
Transpiration -The pulling force that operates on xylem water columns is called Transpiration Pull or Suction Pressure.
Capillary action along with the root pressure, the ascent of sap is mainly due to passive forces that develop within the plant, due to certain environmental factors that act upon the plant. tracheids and vessels of the xylem behave as capillary tubes. Ascent of sap is partly due to the capillarity of these tissues. Thus, the correct answer is option D.
Answer:
The answer to the question-"(H) A researcher, who wants to study the composition of a plant's sap, inserts a capillary tube into the phloem. What causes the sap to flow out of the tube? (B) hydrostatic pressure (C) root pressure (D) transpiration stream (A) capillarity.' is-
(C) root pressure.
Explanation:
When a researcher, wants to study the composition of a plant's sap, and inserts a capillary tube into the phloem, the sap flows out of the tube because of root pressure.
The sap flow out of the tube because of the presence of intermolecular forces between the surrounding solid surfaces and liquid . As the diameter of the tube is extremely small, thus, the combination of adhesive forces and surface tension between container wall and the liquid act to drive forward the liquid.
Since, by an active process the plant roots absorb the excess of water and then it builds up a hydrostatic pressure within the root system, known as root pressure. With the help of this activity ,we can see how because of root pressure pushes the water upwards along the length of the stem.
To know more about direction of movement of sap in phloem click on the link below-
https://brainly.in/question/5992799
To know more about transpiration click on the link below-
https://brainly.in/question/49209056