Advertisements
Advertisements
प्रश्न
Study the diagram given below and answer the questions that follow:
- Name the process being studied in the above experiment.
- Explain the process mentioned in (a) above
- Why is oil placed over water?
- What do we observe with regard to the level of water when this set-up is placed in (1) bright sunlight, (2) humid conditions and (3) windy days?
- Mention any three adaptations found in plants to foster the process mentioned in (a) above
Advertisements
उत्तर
- Transpiration
- The loss of water from aerial sections of the plant in the form of water vapour.
- Oil is poured on water to stop evaporation-induced water loss.
- When the configuration is set,
- Transpiration causes the amount of water to drop in strong sunlight quickly.
- In humid conditions, the water level doesn't change much as the rate of transpiration decreases.
- The water level drops quickly during transpiration on a windy day.
- Leaves have morphological adaptations to control their transpiration rate, as follows:
- Thick cuticle: A quite thick cuticle could cover the leaves, e.g., banyan.
- Loss of leaves: As in cactus, some plants have leaves lost or absent.
- Narrow leaves: In order to decrease the surface area for transpiration, certain plants, such as Nerium, develop narrower leaves.
संबंधित प्रश्न
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
Xylem is the water conducting tissue in plants.
The figure given below is a diagrammatic representation of a part of the cross-section of the root in the root hair zone. Study the same and then answer the questions that follow :
(i) Name the parts indicated by guidelines ‘1’ to ‘5’
(ii) Is the root hair cell unicellular or multi-cellular?
(iii) Draw a labeled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.
(iv) Name the process responsible for the entry of water molecules from the soil into A1 and then A2.
(v) What pressure is responsible for the movement of water in the direction indicated by arrows?
(vi) How is this pressure set up?
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:
Name the process by which intact plants lose water in the form of droplets.
Describe structure of root hair.
Plasma Membrane is ______.
Root hair is ________ extension of epiblema cells.
Trace the pathway followed by water molecules from the time it enters a plant root to the time it escapes into the atmosphere from a leaf.
____________ regions are present in a typical root.
Which part of the root helps in maximum absorption of water and minerals?
