Advertisements
Advertisements
Question
Multiple Choice Question:
The most widely accepted theory for ascent of sap is ______.
Options
capillarity theory
root pressure theory
diffusion
transpiration pull theory
Solution
The most widely accepted theory for ascent of sap is transpiration pull theory.
APPEARS IN
RELATED QUESTIONS
What part is played by The cytoplasm in the uptake of water into the root hair?
The figure shows a diagrammatic representation of the movement of certain substances inside the stem of a certain plant. Write five sentences on whatever you can explain about the processes or the arrangement of structures indicated in the diagram.
Note: - Each sentence must include one or more of the following four words, and each word can be used several times. Xylem, phloem, roots, leaves.
Grapes shrink when immersed in a very strong sugar solution.” Explain.
The below figure shows a root hair:
(i) Label the parts 1 to 4.
(ii) What is the role of part 4?
(iii) Why is the root hair one-celled?
(iv) What will happen to the root hair if some fertilizer is added to the soil near the root hair?
A thin strip of epidermal cells from the fleshy scales of an onion bulb was examined in a drop of water, under a microscope. All the epidermal cells looked alike and the figure alongside represents one of them. The thin strip was then transferred to a drop of strong sugar solution and re-examined under the microscope after about five minutes.
(i) Make a sketch of one of the epidermal cells, as it might appear after immersion in a strong sugar solution. Label any two parts which have undergone a change.
(ii) Give the scientific term for the change shown in Q.(i) above.
(iii) What would you do to bring this cell back to its original condition?
(iv) Give the scientific term used for the recovery of the cell as a result of the step taken in Q.(iii) above.
Name the following:
Root hairs are the extension of which cells.
Name the following:
Name the process by which intact plants lose water in the form of droplets.
Most plant cells and tissues constitutes _____ % water.
What would happen to the leaves of a plant that transpires more water than its absorption in the roots?
Draw a neat and proportionate diagram of root hair and label mitochondria, nucleus and vacuole.
